{"schema":"shake-atlas/answers/v3-day","script_version":"3.0.0","generated_utc":"2026-10-05T16:57:50+00:00","day":{"date_utc": "2026-10-03", "local_label_start": "2026-10-02 20:00 EDT", "local_label_end": "2026-10-03 07:00 EDT", "report_tz": "America/New_York", "anchor_rule": "first full UTC hour at or after each recording start; hour blocks [H, H+1h); no clock-model shift", "window": {"date_utc": "2026-10-03", "hour_labels": ["0000Z", "0100Z", "0200Z", "0300Z", "0400Z", "0500Z", "0600Z", "0700Z", "0800Z", "0900Z", "1000Z"], "n_hours": 11, "n_partial": 0, "start_unix": 1790985600.0, "end_unix": 1791025200.0, "start_iso_utc": "2026-10-03T00:00:00.000Z", "end_iso_utc": "2026-10-03T11:00:00.000Z", "local_start": "2026-10-02 20:00 EDT", "local_end": "2026-10-03 07:00 EDT", "upstairs_stem": "multi_1791026911.329183 2", "downstairs_stem": "multi_1791027086.65238", "skipped_runs": []}, "note": null, "hours": [{"hour_label": "0000Z", "hour_iso_utc": "2026-10-03T00:00:00.000Z", "local_label": "2026-10-02 20:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.013715076, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.011789731, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.00287, "coherence_p90": 0.01032, "coherence_significance": 0.01251, "r_raw": 0.00714, "lag_raw_s": -9.520469, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/0000Z.json"}, {"hour_label": "0100Z", "hour_iso_utc": "2026-10-03T01:00:00.000Z", "local_label": "2026-10-02 21:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.013827749, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.011787336, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.00302, "coherence_p90": 0.01065, "coherence_significance": 0.01251, "r_raw": 0.0088, "lag_raw_s": -1.188531, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/0100Z.json"}, {"hour_label": "0200Z", "hour_iso_utc": "2026-10-03T02:00:00.000Z", "local_label": "2026-10-02 22:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.013970517, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.011781594, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.0031, "coherence_p90": 0.00993, "coherence_significance": 0.01251, "r_raw": 0.00636, "lag_raw_s": -1.97849, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/0200Z.json"}, {"hour_label": "0300Z", "hour_iso_utc": "2026-10-03T03:00:00.000Z", "local_label": "2026-10-02 23:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.014152701, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.01179531, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.00329, "coherence_p90": 0.01039, "coherence_significance": 0.01251, "r_raw": 0.009, "lag_raw_s": 6.248636, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/0300Z.json"}, {"hour_label": "0400Z", "hour_iso_utc": "2026-10-03T04:00:00.000Z", "local_label": "2026-10-03 00:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.014255131, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.011813829, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.00311, "coherence_p90": 0.01085, "coherence_significance": 0.01251, "r_raw": 0.00888, "lag_raw_s": -6.38711, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/0400Z.json"}, {"hour_label": "0500Z", "hour_iso_utc": "2026-10-03T05:00:00.000Z", "local_label": "2026-10-03 01:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.014566616, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.011801515, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.00334, "coherence_p90": 0.01093, "coherence_significance": 0.01251, "r_raw": -0.00638, "lag_raw_s": 5.450664, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/0500Z.json"}, {"hour_label": "0600Z", "hour_iso_utc": "2026-10-03T06:00:00.000Z", "local_label": "2026-10-03 02:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.014707134, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.011912405, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.00301, "coherence_p90": 0.0107, "coherence_significance": 0.01251, "r_raw": -0.007, "lag_raw_s": 2.700447, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/0600Z.json"}, {"hour_label": "0700Z", "hour_iso_utc": "2026-10-03T07:00:00.000Z", "local_label": "2026-10-03 03:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.014920144, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.012021341, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.00327, "coherence_p90": 0.00985, "coherence_significance": 0.01251, "r_raw": 0.00711, "lag_raw_s": -8.700313, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/0700Z.json"}, {"hour_label": "0800Z", "hour_iso_utc": "2026-10-03T08:00:00.000Z", "local_label": "2026-10-03 04:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.014951717, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.012064583, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.00298, "coherence_p90": 0.01011, "coherence_significance": 0.01251, "r_raw": -0.00617, "lag_raw_s": 3.348974, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/0800Z.json"}, {"hour_label": "0900Z", "hour_iso_utc": "2026-10-03T09:00:00.000Z", "local_label": "2026-10-03 05:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.015052673, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.012409291, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.0032, "coherence_p90": 0.01122, "coherence_significance": 0.01251, "r_raw": -0.00652, "lag_raw_s": 7.486094, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/0900Z.json"}, {"hour_label": "1000Z", "hour_iso_utc": "2026-10-03T10:00:00.000Z", "local_label": "2026-10-03 06:00 EDT", "paired": true, "partial": false, "coverage": {"upstairs": 1.0, "downstairs": 1.0}, "site": {"upstairs": {"stem": "multi_1791026911.329183 2", "rms_1s_median_ms2": 0.014945851, "events_in_hour": 0, "events_high_in_hour": 0}, "downstairs": {"stem": "multi_1791027086.65238", "rms_1s_median_ms2": 0.012108493, "events_in_hour": 0, "events_high_in_hour": 0}}, "summary": {"coherence_median": 0.00316, "coherence_p90": 0.00983, "coherence_significance": 0.01251, "r_raw": 0.00826, "lag_raw_s": -8.858274, "matched_pairs": 0, "upstairs_events": 0, "downstairs_events": 0, "verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR"}, "pair_status": "analysed", "file": "hours/1000Z.json"}]},"timeline":{"anchors": {"multi_1791026911.329183 2": {"stem": "multi_1791026911.329183 2", "label": "upstairs", "source_file": "csv/multi_1791026911.329183 2.csv", "t0_unix": 1790983008.31, "t0_iso_utc": "2026-10-02T23:16:48.310Z", "t0_source": "iso_rows", "t0_note": "first ISO-8601 UTC row", "t1_unix": 1791026911.312, "t1_iso_utc": "2026-10-03T11:28:31.312Z", "anchor_unix": 1790985600.0, "anchor_iso_utc": "2026-10-03T00:00:00.000Z", "anchor_local": "2026-10-02 20:00 EDT", "skipped_before_anchor_s": 2591.7, "blocks_full": 11, "blocks_partial": 0, "blocks_dropped": [{"hour_iso_utc": "2026-10-03T11:00:00.000Z", "coverage": 0.4752}], "in_timeline": true}, "multi_1791027086.65238": {"stem": "multi_1791027086.65238", "label": "downstairs", "source_file": "csv/multi_1791027086.65238.csv", "t0_unix": 1790983091.11, "t0_iso_utc": "2026-10-02T23:18:11.110Z", "t0_source": "iso_rows", "t0_note": "first ISO-8601 UTC row", "t1_unix": 1791027086.617, "t1_iso_utc": "2026-10-03T11:31:26.617Z", "anchor_unix": 1790985600.0, "anchor_iso_utc": "2026-10-03T00:00:00.000Z", "anchor_local": "2026-10-02 20:00 EDT", "skipped_before_anchor_s": 2508.9, "blocks_full": 11, "blocks_partial": 0, "blocks_dropped": [{"hour_iso_utc": "2026-10-03T11:00:00.000Z", "coverage": 0.5233}], "in_timeline": true}}, "notes": [], "block_s": 3600.0, "min_coverage": 0.75, "full_coverage": 0.99, "report_tz": "America/New_York"},"headline":{"verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR", "summary_lines": ["upstairs: multi_1791026911.329183 2 — 12.20 h at 100 Hz, background 1 s RMS 0.00543 m/s^2, 3/3 high-confidence/sensitive events, 3 sub-threshold candidates", "downstairs: multi_1791027086.65238 — 12.22 h at 100 Hz, background 1 s RMS 0.00453 m/s^2, 2/2 high-confidence/sensitive events, 4 sub-threshold candidates", "overlap 11.00 h; common rate 100 Hz; safe spectral limit 45 Hz", "median coherence 0.0003 vs significance 0.0011; corrected correlation r=0.0282; matched event pairs 0", "verdict: NO SHARED SIGNAL ABOVE THE NOISE FLOOR", "coherence (robust view, not cherry-picked bins): median 0.0003, p90 0.0009, max 0.0033 over 1351 bins; no bin survives FDR", "positive control: the two microphones correlate at r=0.575 (lag 0.487 s) over the same window, so the phones really did share an environment even though the accelerometers show no shared vibration", "data integrity: PASS (0 failure(s), 9 warning(s))", "answer trust: insufficient_data=8, supported=4, tentative=30, unsupported=8"]},"event_catalog":[{"event_id": "00001", "pair": false, "site": "upstairs", "time_iso_utc": "2026-10-02T23:16:53.310Z", "t_onset_s": 1790983013.31, "upstairs_peak_g": 0.00276, "downstairs_peak_g": null, "amplification_x": null, "dominant_frequency_hz": 18.75, "cross_phone_correlation": null, "estimated_delay_s": null, "sound_correlation": "microphone r=0.017 vs acceleration within this phone", "magnetic_anomaly": "not evaluated per event", "classification": "single-site detection (SNR 15.6 dB, 1.20 s): the other phone has no independent detection within the matching tolerance, so it is not evidence of a shared event", "snr_db": 15.577, "duration_s": 1.2000000476837158}, {"event_id": "00002", "pair": false, "site": "upstairs", "time_iso_utc": "2026-10-02T23:17:05.770Z", "t_onset_s": 1790983025.641, "upstairs_peak_g": 0.006211, "downstairs_peak_g": null, "amplification_x": null, "dominant_frequency_hz": 15.625, "cross_phone_correlation": null, "estimated_delay_s": null, "sound_correlation": "microphone r=0.017 vs acceleration within this phone", "magnetic_anomaly": "not evaluated per event", "classification": "single-site detection (SNR 10.1 dB, 0.28 s): the other phone has no independent detection within the matching tolerance, so it is not evidence of a shared event", "snr_db": 10.133, "duration_s": 0.2799999713897705}, {"event_id": "00003", "pair": false, "site": "upstairs", "time_iso_utc": "2026-10-03T11:28:26.312Z", "t_onset_s": 1791026905.022, "upstairs_peak_g": 0.00688, "downstairs_peak_g": null, "amplification_x": null, "dominant_frequency_hz": 12.5, "cross_phone_correlation": null, "estimated_delay_s": null, "sound_correlation": "microphone r=0.017 vs acceleration within this phone", "magnetic_anomaly": "not evaluated per event", "classification": "single-site detection (SNR 42.7 dB, 1.29 s): the other phone has no independent detection within the matching tolerance, so it is not evidence of a shared event", "snr_db": 42.735, "duration_s": 1.2899999618530273}, {"event_id": "00004", "pair": false, "site": "downstairs", "time_iso_utc": "2026-10-02T23:18:16.110Z", "t_onset_s": 1790983096.11, "upstairs_peak_g": null, "downstairs_peak_g": 0.003067, "amplification_x": null, "dominant_frequency_hz": 3.125, "cross_phone_correlation": null, "estimated_delay_s": null, "sound_correlation": "microphone r=0.016 vs acceleration within this phone", "magnetic_anomaly": "not evaluated per event", "classification": "single-site detection (SNR 28.6 dB, 1.26 s): the other phone has no independent detection within the matching tolerance, so it is not evidence of a shared event", "snr_db": 28.61, "duration_s": 1.2599999904632568}, {"event_id": "00005", "pair": false, "site": "downstairs", "time_iso_utc": "2026-10-03T11:31:21.616Z", "t_onset_s": 1791027080.346, "upstairs_peak_g": null, "downstairs_peak_g": 0.004862, "amplification_x": null, "dominant_frequency_hz": 29.6875, "cross_phone_correlation": null, "estimated_delay_s": null, "sound_correlation": "microphone r=0.016 vs acceleration within this phone", "magnetic_anomaly": "not evaluated per event", "classification": "single-site detection (SNR 36.5 dB, 1.27 s): the other phone has no independent detection within the matching tolerance, so it is not evidence of a shared event", "snr_db": 36.511, "duration_s": 1.2699999809265137}],"event_catalog_note":"one row per matched event pair when pairs exist; otherwise one row per single-site detection with the cross-phone fields explicitly empty, because a one-sided detection is not a shared event","dataset":{"run_id": "day-2026-10-03", "generated_utc": "2026-10-05T16:57:50+00:00", "version": "3.0.0", "recs": {"upstairs": [{"stem": "multi_1791026911.329183 2", "label": "upstairs", "note": "assigned by GPS position (same fix as the 0099 upstairs phone); not user-confirmed", "source_file": "csv/multi_1791026911.329183 2.csv", "rows": 4390299, "fs_hz": 100.000095, "nyquist_hz": 50.000048, "fmax_safe_hz": 45.000043, "span_s": 43903.002, "clock": "utc", "t0_iso_utc": "2026-10-02T23:16:48.310Z", "t1_iso_utc": "2026-10-03T11:28:31.312Z", "source_bytes": 916576302, "source_sha256": "8a503f2145fce71b02b56479235a70b55f44377fdfe7ae1e64761d5d38a4fabf", "channels": ["BMag", "Bx", "By", "Bz", "P", "aHoriz", "aT", "aVert", "altitude", "ax", "ay", "az", "dB", "gFx", "gFy", "gFz", "gMag", "latitude", "longitude", "pitch", "roll", "speed", "time", "wMag", "wx", "wy", "wz", "yaw"]}], "downstairs": [{"stem": "multi_1791027086.65238", "label": "downstairs", "note": "assigned by GPS position (same fix as the 8701 downstairs phone); not user-confirmed", "source_file": "csv/multi_1791027086.65238.csv", "rows": 4399380, "fs_hz": 100.000095, "nyquist_hz": 50.000048, "fmax_safe_hz": 45.000043, "span_s": 43995.507, "clock": "utc", "t0_iso_utc": "2026-10-02T23:18:11.110Z", "t1_iso_utc": "2026-10-03T11:31:26.617Z", "source_bytes": 940647211, "source_sha256": "f9123b31d242e57d894bfd9605ce23cad93714e59c3de69c0e8276ae9d76f9cb", "channels": ["BMag", "Bx", "By", "Bz", "P", "aHoriz", "aT", "aVert", "altitude", "ax", "ay", "az", "dB", "gFx", "gFy", "gFz", "gMag", "latitude", "longitude", "pitch", "roll", "speed", "time", "wMag", "wx", "wy", "wz", "yaw"]}]}, "sites": {"upstairs": [{"stem": "multi_1791026911.329183 2", "label": "upstairs", "rows": 4390299, "fs_hz": 100.000095, "span_s": 43903.002, "clock": "utc", "event_count": 3, "t0_iso_utc": "2026-10-02T23:16:48.310Z", "t1_iso_utc": "2026-10-03T11:28:31.312Z"}], "downstairs": [{"stem": "multi_1791027086.65238", "label": "downstairs", "rows": 4399380, "fs_hz": 100.000095, "span_s": 43995.507, "clock": "utc", "event_count": 2, "t0_iso_utc": "2026-10-02T23:18:11.110Z", "t1_iso_utc": "2026-10-03T11:31:26.617Z"}]}, "sessions": [{"session_id": "D2026-10-03", "upstairs_recording": "csv/multi_1791026911.329183 2.csv", "downstairs_recording": "csv/multi_1791027086.65238.csv", "analysis_status": "analysed", "blocked_reason": null, "overlap": {"available": true, "start_unix": 1790985600.0, "end_unix": 1791025200.0, "start_iso_utc": "2026-10-03T00:00:00.000Z", "end_iso_utc": "2026-10-03T11:00:00.000Z", "duration_s": 39600.0, "duration_h": 11.0, "alignment": "UTC hour grid; no clock-model shift applied"}}], "primary_session": "D2026-10-03", "integrity_gate": {"passed": true, "failures": [], "warnings": ["multi_1790959615.928701: GPS sentinel value -1.0: 22232 sample(s) in speed/altitude", "multi_1790959615.928701: GPS inconsistency: integrated speed 277.139 m vs fix span 26.811 m", "multi_1790959615.928701: gyroscope handling: 1 period(s), 1.5 s, peak 4.781 rad/s", "multi_1791026911.329183 2: 1 gap(s) with dt > 5x the median interval; largest 0.435 s", "multi_1791026911.329183 2: GPS sentinel value -1.0: 424 sample(s) in speed/altitude", "multi_1791026911.329183 2: GPS inconsistency: integrated speed 530.379 m vs fix span 32.063 m", "multi_1791026911.329183 2: gyroscope handling: 4 period(s), 5.53 s, peak 10.602 rad/s", "multi_1791027086.65238: 1 gap(s) with dt > 5x the median interval; largest 2.744 s", "multi_1791027086.65238: gyroscope handling: 2 period(s), 3.82 s, peak 12.406 rad/s"]}},"integrity":{"gate": {"passed": true, "failures": [], "warnings": ["multi_1790959615.928701: GPS sentinel value -1.0: 22232 sample(s) in speed/altitude", "multi_1790959615.928701: GPS inconsistency: integrated speed 277.139 m vs fix span 26.811 m", "multi_1790959615.928701: gyroscope handling: 1 period(s), 1.5 s, peak 4.781 rad/s", "multi_1791026911.329183 2: 1 gap(s) with dt > 5x the median interval; largest 0.435 s", "multi_1791026911.329183 2: GPS sentinel value -1.0: 424 sample(s) in speed/altitude", "multi_1791026911.329183 2: GPS inconsistency: integrated speed 530.379 m vs fix span 32.063 m", "multi_1791026911.329183 2: gyroscope handling: 4 period(s), 5.53 s, peak 10.602 rad/s", "multi_1791027086.65238: 1 gap(s) with dt > 5x the median interval; 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tilt = angle between each block gravity direction and the first block", "note": null}, "gyro_handling_periods": {"available": true, "threshold_rad_s": 0.5, "n": 4, "seconds": 5.529995, "max_w_rad_s": 10.60169, "examples": [{"start_s": 0.719999, "duration_s": 0.829999, "peak_w_rad_s": 2.7973}, {"start_s": 1.809998, "duration_s": 0.33, "peak_w_rad_s": 1.4056}, {"start_s": 2.359998, "duration_s": 0.5, "peak_w_rad_s": 2.1439}, {"start_s": 43899.058296, "duration_s": 3.869996, "peak_w_rad_s": 10.4591}], "n_samples_above": 544, "pct_time_above": 0.012391, "columns": ["wx", "wy", "wz"], "method": "|w| from wx+wy+wz above 0.5 rad/s; consecutive runs merged across dropouts shorter than 0.2 s", "note": null}, "usable_freq_range_hz": [0.0, 45.000045], "nyquist_hz": 50.00005, "fmax_safe_hz": 45.000045, "gps_artifacts": {"available": true, "n_sentinels": 424, "sentinel_value": -1.0, "sentinel_columns": ["speed", "altitude"], "sentinel_count_source": "meta.gps_sentinels.count (higher than measured)", "fix_span_m": 32.062876, "fix_span_method": "equirectangular bounding box: dNS = dLat * 111320 m, dEW = dLon * 111320 * cos(box-centre latitude) m, span = diagonal", "lat_range_m": 18.26004, "lon_range_m": 26.355245, "n_fix_valid": 4390299, "n_bad_fix": 0, "n_fix_missing": 0, "integrated_speed_m": 530.378532, "integrated_speed_n_points": 4389874, "moving_while_fix_static": true, "speed_max_mps": 2.142, "speed_median_mps": 0.012079, "n_speed_sentinel": 0, "n_altitude_sentinel": 0, "altitude_median_m": 5.134913, "altitude_range_m": 12.4958, "note": "424 sentinel value(s) -1.0 in speed/altitude. GPS position fixes span only 32.063 m while the trapezoid integral of the reported speed is 530.379 m: the speed column reports motion the position fixes do not show.", "source": "latitude, longitude, speed, altitude", "integrated_speed_method": "np.trapezoid-equivalent streaming trapezoid of speed on the time vector, sentinel/NaN samples treated as missing", "fix_center_lat_deg": 27.548908234, "fix_center_lon_deg": -80.362224579}, "exclusions": ["start/stop trim window of 5.0 s at each end (handling while the recording is started and stopped)", "1 gap span(s) where dt > 5.0 x the median interval (0.435 s total)", "GPS sentinel value -1.0 in speed/altitude (recorded as missing, not motion)"], "valid_fraction": 0.999782475, "valid_fraction_detail": {"n_rows": 4390299, "n_excluded_trim": 955, "n_excluded_gaps": 0, "n_excluded_nonfinite_vibration_in_window": 0, "n_excluded_nonfinite_vibration_total": 0, "n_usable": 4389344, "vibration_channels_used": ["ax", "ay", "az"], "rule": "usable = rows - trim window - gap spans - non-finite samples in ax/ay/az inside the analysis window"}, "trim_window_s": 5.0, "trim_window_index": [498, 4389842], "notes": ["measured rate 100.0001 Hz differs from meta.sampling.fs_hz 100.000095 Hz", "sampling interval 0.01 s median, jitter 7.4735% (0.000747 s std)", "largest gap 0.435 s is 43.5x the median interval", "GPS artefacts: 424 sentinel value(s) (-1.0) in speed/altitude", "GPS inconsistency: integrated speed 530.379 m vs GPS fix span 32.063 m", "gyroscope handling: 4 period(s), 5.53 s total above 0.5 rad/s (peak 10.602 rad/s)", "gravity direction changed by 0.081 deg between the first and last 5% of the recording (mounting/orientation drift)", "99.98% of samples are usable for vibration analysis after exclusions"], "array_hashes": {"verified": true, "mode": "npy header + partial sha256", "n_meta_entries": 28, "n_checked": 28, "n_header_parsed": 28, "n_complete_hash": 0, "n_partial_hash": 28, "n_files_missing": 0, "mismatches": [], "notes": ["28 array file(s) hashed only partially (bounded read budget)"]}, "integrity_version": "1.0.0", "required_keys_present": true, "keys_missing": [], "gate": {"passed": true, "failures": [], "warnings": ["1 gap(s) with dt > 5x the median interval; largest 0.435 s", "GPS sentinel value -1.0: 424 sample(s) in speed/altitude", "GPS inconsistency: integrated speed 530.379 m vs fix span 32.063 m", "gyroscope handling: 4 period(s), 5.53 s, peak 10.602 rad/s"]}}, "multi_1791027086.65238": {"source_file": "csv/multi_1791027086.65238.csv", "stem": "multi_1791027086.65238", "sha256": "f9123b31d242e57d894bfd9605ce23cad93714e59c3de69c0e8276ae9d76f9cb", "sha256_source": "meta.source_sha256", "bytes": 940647211, "rows": 4399380, "duration_s": 43995.507, "fs_hz_measured": 100.0001, "fs_nominal_hz": null, "meta_rate_hz": 100.000095, "dt_median_s": 0.00999999, "dt_mean_s": 0.01000039, "dt_jitter_std_s": 0.000736582, "dt_jitter_pct": 7.365827, "dt_method": "single streaming pass over the time vector in 200000-row blocks", "dt_median_method": "exact median and std over the dt window +/-0.0025 s around the sampled estimate", "time_resolution_s": null, "fs_hz_from": "median dt", "fs_hz_from_mean_dt": 99.996100152, "n_finite_time_values": 4399380, "time_finite_fraction": 1.0, "time_vector_usable": true, "largest_gap_s": 2.743999958, "n_gaps": 1, "gap_threshold_s": 0.049999952, "gap_seconds_total": 2.744, "n_gap_spans": 1, "duplicate_timestamps": 0, "non_monotonic_timestamps": 0, "n_intervals": 4399379, "n_missing_time_values": 0, "missing_by_sensor": {"BMag": null, "Bx": {"n": 0, "pct": 0.0}, "By": {"n": 0, "pct": 0.0}, "Bz": {"n": 0, "pct": 0.0}, "P": {"n": 0, "pct": 0.0}, "aHoriz": null, "aT": null, "aVert": null, "altitude": {"n": 0, "pct": 0.0}, "ax": {"n": 0, "pct": 0.0}, "ay": {"n": 0, "pct": 0.0}, "az": {"n": 0, "pct": 0.0}, "dB": {"n": 0, "pct": 0.0}, "gFx": {"n": 0, "pct": 0.0}, "gFy": {"n": 0, "pct": 0.0}, "gFz": {"n": 0, "pct": 0.0}, "gMag": null, "latitude": {"n": 0, "pct": 0.0}, "longitude": {"n": 0, "pct": 0.0}, "pitch": {"n": 0, "pct": 0.0}, "roll": {"n": 0, "pct": 0.0}, "speed": {"n": 0, "pct": 0.0}, "time": {"n": 0, "pct": 0.0}, "wMag": null, "wx": {"n": 0, "pct": 0.0}, "wy": {"n": 0, "pct": 0.0}, "wz": {"n": 0, "pct": 0.0}, "yaw": {"n": 0, "pct": 0.0}}, "sensor_columns_present": ["ax", "ay", "az", "gFx", "gFy", "gFz", "wx", "wy", "wz", "P", "Bx", "By", "Bz", "dB", "latitude", "longitude", "altitude", "speed", "yaw", "pitch", "roll"], "absent_sensors": [], "extra_columns": [], "clock_kind": "utc", "clock_note": "UTC clock: 2026-10-02T23:18:11.110Z .. 2026-10-03T11:31:26.617Z (43995.507 s)", "clock": {"kind": "utc", "note": "UTC clock: 2026-10-02T23:18:11.110Z .. 2026-10-03T11:31:26.617Z (43995.507 s)", "t0_unix": 1790983091.11, "t1_unix": 1791027086.617, "t0_iso_utc": "2026-10-02T23:18:11.110Z", "t1_iso_utc": "2026-10-03T11:31:26.617Z", "span_s": 43995.507}, "identity": {"label": "downstairs", "note": "assigned by GPS position (same fix as the 8701 downstairs phone); not user-confirmed", "phone_model_note": "the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"}, "orientation_stability": {"available": true, "source": "recorded yaw/pitch/roll columns", "roll_std_deg": 1.552564, "pitch_std_deg": 8.37875, "yaw_std_deg": 1.122873, "roll_drift_deg": 0.572957, "pitch_drift_deg": 0.0, "yaw_drift_deg": 3.599998, "tilt_change_deg": 0.018239, "n_blocks": 21996, "block_s": 2.0, "method": "block medians of recorded yaw/pitch/roll in 200-sample blocks (~2.0 s); tilt change = angle between the mean gravity direction of the first and last 5% of blocks", "note": null}, "gravity_stability": {"available": true, "mean_ms2": 1.000155114, "std_ms2": 0.002010083, "min_ms2": 0.51129386, "max_ms2": 1.513167595, "p50_ms2": 1.000133586, "trend_per_hour_ms2": -0.001999355, "tilt_change_deg": 21.236435, "tilt_p50_deg": 21.227344, "p95_tilt_deg": 21.250449, "tilt_max_deg": 21.308931, "n_blocks": 21996, "method": "|g| mean/std over all samples plus 200-sample block medians (~2.0 s); tilt = angle between each block gravity direction and the first block", "note": null}, "gyro_handling_periods": {"available": true, "threshold_rad_s": 0.5, "n": 2, "seconds": 3.819996, "max_w_rad_s": 12.406075, "examples": [{"start_s": 0.13, "duration_s": 3.109997, "peak_w_rad_s": 5.1687}, {"start_s": 43993.038207, "duration_s": 0.709999, "peak_w_rad_s": 12.3576}], "n_samples_above": 346, "pct_time_above": 0.007865, "columns": ["wx", "wy", "wz"], "method": "|w| from wx+wy+wz above 0.5 rad/s; consecutive runs merged across dropouts shorter than 0.2 s", "note": null}, "usable_freq_range_hz": [0.0, 45.000045], "nyquist_hz": 50.00005, "fmax_safe_hz": 45.000045, "gps_artifacts": {"available": true, "n_sentinels": 0, "sentinel_value": -1.0, "sentinel_columns": [], "sentinel_count_source": "measured from arrays", "fix_span_m": 4.22222, "fix_span_method": "equirectangular bounding box: dNS = dLat * 111320 m, dEW = dLon * 111320 * cos(box-centre latitude) m, span = diagonal", "lat_range_m": 1.910934, "lon_range_m": 3.765033, "n_fix_valid": 4399380, "n_bad_fix": 0, "n_fix_missing": 0, "integrated_speed_m": 1.308505, "integrated_speed_n_points": 4399379, "moving_while_fix_static": false, "speed_max_mps": 0.2484, "speed_median_mps": 2.5e-05, "n_speed_sentinel": 0, "n_altitude_sentinel": 0, "altitude_median_m": 3.600228, "altitude_range_m": 1.203, "note": "integrated speed (1.309 m) is consistent with the GPS fix span (4.222 m) within the 5x / 25 m tolerance.", "source": "latitude, longitude, speed, altitude", "integrated_speed_method": "np.trapezoid-equivalent streaming trapezoid of speed on the time vector, sentinel/NaN samples treated as missing", "fix_center_lat_deg": 27.548974037, "fix_center_lon_deg": -80.362224579}, "exclusions": ["start/stop trim window of 5.0 s at each end (handling while the recording is started and stopped)", "1 gap span(s) where dt > 5.0 x the median interval (2.744 s total)"], "valid_fraction": 0.999834977, "valid_fraction_detail": {"n_rows": 4399380, "n_excluded_trim": 726, "n_excluded_gaps": 0, "n_excluded_nonfinite_vibration_in_window": 0, "n_excluded_nonfinite_vibration_total": 0, "n_usable": 4398654, "vibration_channels_used": ["ax", "ay", "az"], "rule": "usable = rows - trim window - gap spans - non-finite samples in ax/ay/az inside the analysis window"}, "trim_window_s": 5.0, "trim_window_index": [500, 4399154], "notes": ["measured rate 100.0001 Hz differs from meta.sampling.fs_hz 100.000095 Hz", "sampling interval 0.01 s median, jitter 7.3658% (0.000737 s std)", "largest gap 2.744 s is 274.4x the median interval", "gyroscope handling: 2 period(s), 3.82 s total above 0.5 rad/s (peak 12.406 rad/s)", "gravity direction changed by 0.018 deg between the first and last 5% of the recording (mounting/orientation drift)", "99.98% of samples are usable for vibration analysis after exclusions"], "array_hashes": {"verified": true, "mode": "npy header + partial sha256", "n_meta_entries": 28, "n_checked": 28, "n_header_parsed": 28, "n_complete_hash": 0, "n_partial_hash": 28, "n_files_missing": 0, "mismatches": [], "notes": ["28 array file(s) hashed only partially (bounded read budget)"]}, "integrity_version": "1.0.0", "required_keys_present": true, "keys_missing": [], "gate": {"passed": true, "failures": [], "warnings": ["1 gap(s) with dt > 5x the median interval; largest 2.744 s", "gyroscope handling: 2 period(s), 3.82 s, peak 12.406 rad/s"]}}}, "summary_lines": ["multi_1790959520.160099 | upstairs | 1514228 rows | fs 100.0001 Hz | duration 15141.9 s | jitter 7.8512% | gaps 0 (max 0.023 s) | missing ax/ay/az none | GPS:ok | valid 99.93% | PASS", "multi_1790959615.928701 | downstairs | 1350572 rows | fs 100.0001 Hz | duration 13505.6 s | jitter 8.289% | gaps 0 (max 0.016 s) | missing ax/ay/az none | GPS:fix-static/speed-moving(277.0 m vs 27.0 m fix span) | valid 99.93% | WARN", "multi_1791026911.329183 2 | upstairs | 4390299 rows | fs 100.0001 Hz | duration 43903.0 s | jitter 7.4735% | gaps 1 (max 0.435 s) | missing ax/ay/az none | GPS:fix-static/speed-moving(530.0 m vs 32.0 m fix span) | valid 99.98% | WARN", "multi_1791027086.65238 | downstairs | 4399380 rows | fs 100.0001 Hz | duration 43995.5 s | jitter 7.3658% | gaps 1 (max 2.744 s) | missing ax/ay/az none | GPS:ok | valid 99.98% | WARN", "DATASET INTEGRITY PASS: 4 recording(s), 3 pass-with-warnings, 0 fail"]},"sessions":[{"session_id": "D2026-10-03", "kind": "day", "upstairs_recording": "csv/multi_1791026911.329183 2.csv", "downstairs_recording": "csv/multi_1791027086.65238.csv", "upstairs_stem": "multi_1791026911.329183 2", "downstairs_stem": "multi_1791027086.65238", "upstairs_label": "upstairs", "downstairs_label": "downstairs", "overlap": {"available": true, "start_unix": 1790985600.0, "end_unix": 1791025200.0, "start_iso_utc": "2026-10-03T00:00:00.000Z", "end_iso_utc": "2026-10-03T11:00:00.000Z", "duration_s": 39600.0, "duration_h": 11.0, "alignment": "UTC hour grid; no clock-model shift applied"}, "analysis_status": "analysed", "blocked_reason": null, "date_utc": "2026-10-03", "hour_labels": ["0000Z", "0100Z", "0200Z", "0300Z", "0400Z", "0500Z", "0600Z", "0700Z", "0800Z", "0900Z", "1000Z"], "n_hours": 11, "n_partial": 0, "skipped_runs": []}],"session_results":[{"session_id": "D2026-10-03", "upstairs_recording": "csv/multi_1791026911.329183 2.csv", "downstairs_recording": "csv/multi_1791027086.65238.csv", "upstairs_stem": "multi_1791026911.329183 2", "downstairs_stem": "multi_1791027086.65238", "overlap": {"available": true, "start_unix": 1790985600.0, "end_unix": 1791025200.0, "start_iso_utc": "2026-10-03T00:00:00.000Z", "end_iso_utc": "2026-10-03T11:00:00.000Z", "duration_s": 39600.0, "duration_h": 11.0, "both_clocks_absolute": true, "window_applied": true, "alignment": "UTC hour grid, no clock shift"}, "sample_rates": {"upstairs_hz": 100.000095, "downstairs_hz": 100.000095, "common_hz": 100.000095, "resample_method": "numpy.interp / numpy.interp", "antialias_applied": false, "upsample_interpolated": false, "nyquist_hz": 50.000048, "fmax_safe_hz": 45.000043, "freq_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "note": "fs_common = min(fs_up, fs_down); spectral claims are limited to 45.00 Hz and nothing above it is reported as real content"}, "event_matching": {"tolerance_s": 1.5, "near_tolerance_s": 5.0, "n_a": 0, "n_b": 0, "n_matched": 0, "n_unmatched_up": 0, "n_unmatched_down": 0, "matched_up_indices": [], "matched_down_indices": [], "unmatched_up_indices": [], "unmatched_down_indices": [], "closest_pair_s": null, "offset_s_median": null, "offset_s_mad": null, "offset_s_quantiles": null, "note": "a match means both sites had an independent detection inside the tolerance window; unmatched detections are reported as such, and threshold differences make weak shared events look one-sided", "upstairs_events": 0, "downstairs_events": 0, "events_window": "only detections with onset inside the analysed window are matched", "matched_pairs": 0, "unmatched_upstairs": 0, "unmatched_downstairs": 0}, "matched_events": [], "unmatched_up_events": [], "unmatched_down_events": [], "channels": {"signed_channel_used": "aVert", "detection_channel_used": "aT (unsigned) for event detection only", "gravity_available_upstairs": true, "gravity_available_downstairs": true, "gravity_cos_deg": 2.86, "note": "signed vertical projection used for spectra/coherence/delay; the two phones sit in different body orientations, so only the gravity-aligned direction is physically common. the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"}, "clock": {"offset_s": -3.371819, "slope_s_per_s": 0.0, "drift_s": 0.0, "drift_ppm": 0.0, "method": "cross-correlation peak lag (no matched events)", "n_anchors": 0, "ci_s": null, "applied": false, "note": "estimate only - the UTC hour grid is the alignment, no shift was applied to the data", "estimated": true, "correction_form": "none applied (UTC hour grid is the alignment)", "corrected_overlap_s": 39600.0}, "correlation": {"channel": "aVert", "raw": {"delay_s": -3.371819, "r": 0.0282, "significant_threshold_approx": 0.00696, "significant": true, "method": "normalised linear cross-correlation on a common 100.000 Hz grid, +/-10 s", "wraparound_used": false}, "corrected": {"delay_s": -3.371819, "r": 0.0282, "significant_threshold_approx": 0.00696, "significant": true, "n_samples": 3960004, "note": "linear (non-circular) correlation on the shift+trimmed grid; residual lag after the clock fit is the part the clock model did not explain"}}, "coherence": {"curve": {"freqs_hz": [0.0, 0.0333, 0.0667, 0.1, 0.1333, 0.1667, 0.2, 0.2333, 0.2667, 0.3, 0.3333, 0.3667, 0.4, 0.4333, 0.4667, 0.5, 0.5333, 0.5667, 0.6, 0.6333, 0.6667, 0.7, 0.7333, 0.7667, 0.8, 0.8333, 0.8667, 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alpha^(1/(M-1)) for M Welch segments; coherence above it is unlikely to come from two independent signals, and coherence below it is not evidence of sharing", "fraction_above_significance": 0.0614, "band_summary": {"0.25-1 Hz": {"n_bins": 22, "median_coherence": 0.0003, "fraction_above_significance": 0.0}, "1-4 Hz": {"n_bins": 90, "median_coherence": 0.00032, "fraction_above_significance": 0.1111}, "4-12 Hz": {"n_bins": 240, "median_coherence": 0.00029, "fraction_above_significance": 0.075}, "12-32 Hz": {"n_bins": 600, "median_coherence": 0.00028, "fraction_above_significance": 0.0517}, "32-45 Hz": {"n_bins": 390, "median_coherence": 0.00025, "fraction_above_significance": 0.0615}}, "fmax_safe_hz": 45.0, "channel": "aVert", "method": "magnitude-squared coherence, 30 s Hann segments, 50% overlap, on the signed vertical channel", "multiplicity": {"available": true, "method": "Benjamini-Hochberg FDR on the per-bin null coherence distribution Beta(1, n_seg-1), p = (1 - c)**(n_seg-1)", "alpha": 0.05, "n_bins": 1351, "n_seg": 2639, "n_above_alpha_threshold": 83, "expected_false_positives": 67.5, "n_surviving_fdr": 0, "fraction_surviving_fdr": 0.0, "q_min": 0.16203, "median_p_value": 0.48549, "surviving_bins": [], "verdict": "no bin survives FDR: the bins above the single-bin threshold are consistent with multiplicity", "note": "with 1351 bins at alpha = 0.05, about 68 bins cross the threshold by chance alone; q-values account for that", "family_wise_test": {"observed_max_coh": 0.00331, "observed_max_coh_freq_hz": 19.8, "surrogate_max_p95": 0.00371, "p_value": 0.1791, "significant": false, "mode": "permute", "n_segments": 2639, "note": "the maximum-coherence test is family-wise: a single cherry-picked bin must beat the surrogate distribution of the maximum, not just the per-bin threshold"}, "combined_verdict": "no bin survives FDR control", "individual_bins_established": false, "candidate_feature": null, "summary_line": "median 0.0003, p90 0.0009, max 0.0033 over 1351 bins; no bin survives FDR"}, "headline_finding": "median 0.0003, p90 0.0009, max 0.0033 over 1351 bins; no bin survives FDR", "surrogate_test": {"available": true, "method": "segment-permutation surrogates", "mode": "permute", "n_segments": 2639, "nperseg": 3000, "median_coh": 0.00027, "surrogate_median": 0.00026, "surrogate_p95": 0.00028, "p_value": 0.22886, "n_surrogates": 200, "significant": false, "observed_max_coh": 0.00331, "observed_max_coh_freq_hz": 19.8, "surrogate_max_median": 0.00283, "surrogate_max_p95": 0.00371, "max_coh_p_value": 0.1791, "max_coh_significant": false, "max_test_note": "the maximum-coherence test is family-wise: a single cherry-picked bin must beat the surrogate distribution of the maximum, not just the per-bin threshold", "significance_note": "p is the fraction of segment-permuted surrogates whose median (or maximum) coherence is at least as large as observed", "fmax_safe_hz": 45.0}}, "spectral_ratio": {"curve": {"freqs_hz": [0.0, 0.0333, 0.0667, 0.1, 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{"window": 128, "class": "active", "start_s": 38399.964, "end_s": 38699.963, "rms_up_ms2": 0.010421686, "rms_down_ms2": 0.006271552, "activity_ms2": 0.008346619, "correlation": 0.00197}, {"window": 129, "class": "active", "start_s": 38699.963, "end_s": 38999.963, "rms_up_ms2": 0.010763135, "rms_down_ms2": 0.00644403, "activity_ms2": 0.008603583, "correlation": -0.00313}, {"window": 130, "class": "normal", "start_s": 38999.963, "end_s": 39299.963, "rms_up_ms2": 0.010393425, "rms_down_ms2": 0.006175912, "activity_ms2": 0.008284669, "correlation": 0.00953}, {"window": 131, "class": "active", "start_s": 39299.963, "end_s": 39599.962, "rms_up_ms2": 0.010294936, "rms_down_ms2": 0.006418829, "activity_ms2": 0.008356882, "correlation": -0.00215}], "quiet": {"n_windows": 26, "median_correlation": 0.00013, "mean_correlation": -0.00124, "p95_abs_correlation": 0.01282, "median_variance_explained": 0.0, "rms_range_ms2": [0.007083041, 0.007342196]}, "normal": {"n_windows": 80, "median_correlation": 0.00013, "mean_correlation": 0.00133, "p95_abs_correlation": 0.01306, "median_variance_explained": 0.0, "rms_range_ms2": [0.007343353, 0.008304341]}, "active": {"n_windows": 26, "median_correlation": 0.00132, "mean_correlation": 0.00042, "p95_abs_correlation": 0.00932, "median_variance_explained": 2e-06, "rms_range_ms2": [0.008325025, 0.010610496]}, "activity_contrast_db": 2.363, "activity_contrast_note": "quiet and active window RMS differ by 2.36 dB; a contrast below about 3 dB means the recording has no meaningful activity structure and the labels are only a ranking of a nearly constant noise floor"}, "amplification_summary": {"available": false, "n_pairs": 0, "verdict": "INSUFFICIENT MATCHED EVENTS", "verdict_reason": "fewer than 4 matched events carry a usable amplitude ratio, so the direction of amplification cannot be established", "decision_rule": "UPSTAIRS/DOWNSTAIRS SUPPORTED requires >=4 matched events, a bootstrap CI that excludes 1.0 and a median ratio outside 0.8-1.25; anything else is NO CLEAR DIRECTION", "note_no_excitation": "without a shared event there is no excitation to amplify, so all-time ratios measure the phones and their mounting, not the building"}, "axis_amplification": {"per_site_rms_ms2": {"upstairs": {"ax": 0.023906698, "ay": 0.028106796, "az": 0.039653176, "vertical_signed": 0.040582906, "horizontal": 0.036737308, "resultant": 0.054741229}, "downstairs": {"ax": 0.032926342, "ay": 0.016962163, "az": 0.025835878, "vertical_signed": 0.025923697, "horizontal": 0.037009586, "resultant": 0.045185701}}, "upstairs_over_downstairs": {"az": 1.5348, "horizontal": 0.9926, "resultant": 1.2115, "ax": 0.7261, "vertical_signed": 1.5655, "ay": 1.657}, "comparable_directions": ["vertical_signed", "horizontal", "resultant"], "note": "only gravity-aligned directions are physically comparable across the two phones; body-frame axes are reported per phone only", "spectral_ratio_median_gain_db": 0.5158}, "common_signal": {"verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR", "evidence": ["matched event pairs: 0 of 0 upstairs / 0 downstairs detections", "median coherence 0.0003 (significance level 0.0011), fraction of bins above significance 0.061", "surrogate test: p = 0.22886 over 200 circular time shifts (median surrogate coherence 0.00026)", "corrected correlation r = 0.0282 (approx. 95% threshold 0.007, variance explained 0.080%)", "clock model: not applied (estimate only - the UTC hour grid is the alignment, no shift was applied to the data)", "the correlation is statistically detectable only because of the sample count: |r| < 0.05, i.e. it explains less than 0.25% of the variance"], "criteria": {"coherence_above_significance": false, "three_or_more_matched_events": false, "correlation_significant": true, "correlation_exceeds_effect_size": false, "variance_explained": 0.000795, "min_effect_size_abs_r": 0.05, "surrogate_not_contradicting": false}, "note": "\"no shared signal above the noise floor\" is a statement about this measurement, not proof that the building does not vibrate"}, "limits": {"fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "freq_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "coverage_s": 39600.0, "sessions_analysed": 1}, "interpretation_limits": ["a single passive session cannot identify a source (HVAC, pump, fan, traffic, structural defect); that needs a labelled on/off or phone-swap experiment", "the phones are the same model but separate units: the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ", "anything above 45.00 Hz is interpolation or aliasing, not measurement", "pooling many hours of noise does not create a common signal; it only lowers the detectable level"]}],"cross_phone":{"session_id": "D2026-10-03", "upstairs_recording": "csv/multi_1791026911.329183 2.csv", "downstairs_recording": "csv/multi_1791027086.65238.csv", "upstairs_stem": "multi_1791026911.329183 2", "downstairs_stem": "multi_1791027086.65238", "overlap": {"available": true, "start_unix": 1790985600.0, "end_unix": 1791025200.0, "start_iso_utc": "2026-10-03T00:00:00.000Z", "end_iso_utc": "2026-10-03T11:00:00.000Z", "duration_s": 39600.0, "duration_h": 11.0, "both_clocks_absolute": true, "window_applied": true, "alignment": "UTC hour grid, no clock shift"}, "sample_rates": {"upstairs_hz": 100.000095, "downstairs_hz": 100.000095, "common_hz": 100.000095, "resample_method": "numpy.interp / numpy.interp", "antialias_applied": false, "upsample_interpolated": false, "nyquist_hz": 50.000048, "fmax_safe_hz": 45.000043, "freq_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "note": "fs_common = min(fs_up, fs_down); spectral claims are limited to 45.00 Hz and nothing above it is reported as real content"}, "event_matching": {"tolerance_s": 1.5, "near_tolerance_s": 5.0, "n_a": 0, "n_b": 0, "n_matched": 0, "n_unmatched_up": 0, "n_unmatched_down": 0, "matched_up_indices": [], "matched_down_indices": [], "unmatched_up_indices": [], "unmatched_down_indices": [], "closest_pair_s": null, "offset_s_median": null, "offset_s_mad": null, "offset_s_quantiles": null, "note": "a match means both sites had an independent detection inside the tolerance window; unmatched detections are reported as such, and threshold differences make weak shared events look one-sided", "upstairs_events": 0, "downstairs_events": 0, "events_window": "only detections with onset inside the analysed window are matched", "matched_pairs": 0, "unmatched_upstairs": 0, "unmatched_downstairs": 0}, "matched_events": [], "unmatched_up_events": [], "unmatched_down_events": [], "channels": {"signed_channel_used": "aVert", "detection_channel_used": "aT (unsigned) for event detection only", "gravity_available_upstairs": true, "gravity_available_downstairs": true, "gravity_cos_deg": 2.86, "note": "signed vertical projection used for spectra/coherence/delay; the two phones sit in different body orientations, so only the gravity-aligned direction is physically common. the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"}, "clock": {"offset_s": -3.371819, "slope_s_per_s": 0.0, "drift_s": 0.0, "drift_ppm": 0.0, "method": "cross-correlation peak lag (no matched events)", "n_anchors": 0, "ci_s": null, "applied": false, "note": "estimate only - the UTC hour grid is the alignment, no shift was applied to the data", "estimated": true, "correction_form": "none applied (UTC hour grid is the alignment)", "corrected_overlap_s": 39600.0}, "correlation": {"channel": "aVert", "raw": {"delay_s": -3.371819, "r": 0.0282, "significant_threshold_approx": 0.00696, "significant": true, "method": "normalised linear cross-correlation on a common 100.000 Hz grid, +/-10 s", "wraparound_used": false}, "corrected": {"delay_s": -3.371819, "r": 0.0282, "significant_threshold_approx": 0.00696, 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0.0517}, "32-45 Hz": {"n_bins": 390, "median_coherence": 0.00025, "fraction_above_significance": 0.0615}}, "fmax_safe_hz": 45.0, "channel": "aVert", "method": "magnitude-squared coherence, 30 s Hann segments, 50% overlap, on the signed vertical channel", "multiplicity": {"available": true, "method": "Benjamini-Hochberg FDR on the per-bin null coherence distribution Beta(1, n_seg-1), p = (1 - c)**(n_seg-1)", "alpha": 0.05, "n_bins": 1351, "n_seg": 2639, "n_above_alpha_threshold": 83, "expected_false_positives": 67.5, "n_surviving_fdr": 0, "fraction_surviving_fdr": 0.0, "q_min": 0.16203, "median_p_value": 0.48549, "surviving_bins": [], "verdict": "no bin survives FDR: the bins above the single-bin threshold are consistent with multiplicity", "note": "with 1351 bins at alpha = 0.05, about 68 bins cross the threshold by chance alone; q-values account for that", "family_wise_test": {"observed_max_coh": 0.00331, "observed_max_coh_freq_hz": 19.8, "surrogate_max_p95": 0.00371, "p_value": 0.1791, "significant": false, "mode": "permute", "n_segments": 2639, "note": "the maximum-coherence test is family-wise: a single cherry-picked bin must beat the surrogate distribution of the maximum, not just the per-bin threshold"}, "combined_verdict": "no bin survives FDR control", "individual_bins_established": false, "candidate_feature": null, "summary_line": "median 0.0003, p90 0.0009, max 0.0033 over 1351 bins; no bin survives FDR"}, "headline_finding": "median 0.0003, p90 0.0009, max 0.0033 over 1351 bins; no bin survives FDR", "surrogate_test": {"available": true, "method": "segment-permutation surrogates", "mode": "permute", "n_segments": 2639, "nperseg": 3000, "median_coh": 0.00027, "surrogate_median": 0.00026, "surrogate_p95": 0.00028, "p_value": 0.22886, "n_surrogates": 200, "significant": false, "observed_max_coh": 0.00331, "observed_max_coh_freq_hz": 19.8, "surrogate_max_median": 0.00283, "surrogate_max_p95": 0.00371, "max_coh_p_value": 0.1791, "max_coh_significant": 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nearly constant noise floor"}, "amplification_summary": {"available": false, "n_pairs": 0, "verdict": "INSUFFICIENT MATCHED EVENTS", "verdict_reason": "fewer than 4 matched events carry a usable amplitude ratio, so the direction of amplification cannot be established", "decision_rule": "UPSTAIRS/DOWNSTAIRS SUPPORTED requires >=4 matched events, a bootstrap CI that excludes 1.0 and a median ratio outside 0.8-1.25; anything else is NO CLEAR DIRECTION", "note_no_excitation": "without a shared event there is no excitation to amplify, so all-time ratios measure the phones and their mounting, not the building"}, "axis_amplification": {"per_site_rms_ms2": {"upstairs": {"ax": 0.023906698, "ay": 0.028106796, "az": 0.039653176, "vertical_signed": 0.040582906, "horizontal": 0.036737308, "resultant": 0.054741229}, "downstairs": {"ax": 0.032926342, "ay": 0.016962163, "az": 0.025835878, "vertical_signed": 0.025923697, "horizontal": 0.037009586, "resultant": 0.045185701}}, "upstairs_over_downstairs": {"az": 1.5348, "horizontal": 0.9926, "resultant": 1.2115, "ax": 0.7261, "vertical_signed": 1.5655, "ay": 1.657}, "comparable_directions": ["vertical_signed", "horizontal", "resultant"], "note": "only gravity-aligned directions are physically comparable across the two phones; body-frame axes are reported per phone only", "spectral_ratio_median_gain_db": 0.5158}, "common_signal": {"verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR", "evidence": ["matched event pairs: 0 of 0 upstairs / 0 downstairs detections", "median coherence 0.0003 (significance level 0.0011), fraction of bins above significance 0.061", "surrogate test: p = 0.22886 over 200 circular time shifts (median surrogate coherence 0.00026)", "corrected correlation r = 0.0282 (approx. 95% threshold 0.007, variance explained 0.080%)", "clock model: not applied (estimate only - the UTC hour grid is the alignment, no shift was applied to the data)", "the correlation is statistically detectable only because of the sample count: |r| < 0.05, i.e. it explains less than 0.25% of the variance"], "criteria": {"coherence_above_significance": false, "three_or_more_matched_events": false, "correlation_significant": true, "correlation_exceeds_effect_size": false, "variance_explained": 0.000795, "min_effect_size_abs_r": 0.05, "surrogate_not_contradicting": false}, "note": "\"no shared signal above the noise floor\" is a statement about this measurement, not proof that the building does not vibrate"}, "limits": {"fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "freq_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "coverage_s": 39600.0, "sessions_analysed": 1}, "interpretation_limits": ["a single passive session cannot identify a source (HVAC, pump, fan, traffic, structural defect); that needs a labelled on/off or phone-swap experiment", "the phones are the same model but separate units: the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ", "anything above 45.00 Hz is interpolation or aliasing, not measurement", "pooling many hours of noise does not create a common signal; it only lowers the detectable level"]},"cross_sensor":{"available": true, "note": "channel pairs are compared over the same overlapping window at the common sample rate; a significant acoustic correlation would be a positive control that the two phones really did share an environment", "acoustic": {"available": true, "channel_pair": "dB (microphone level)", "n_samples": 3960004, "lag_s": 0.48669, "r": 0.57533, "median_coherence": 0.00033, "coherence_significance": 0.00113, "coherence_significant": false, "method": "common 100.000 Hz grid, normalised cross-correlation, Welch coherence"}, "magnetic": {"available": true, "channel_pair": "|B|", "n_samples": 3960004, "lag_s": -3.57777, "r": 0.54784, "median_coherence": 0.00027, "coherence_significance": 0.00113, "coherence_significant": false, "method": "common 100.000 Hz grid, normalised cross-correlation, Welch coherence"}, "pressure": {"available": true, "channel_pair": "P(Pa)", "n_samples": 3960004, "lag_s": 0.00049, "r": 0.99999, "median_coherence": 0.00171, "coherence_significance": 0.00113, "coherence_significant": true, "method": "common 100.000 Hz grid, normalised cross-correlation, Welch coherence"}, "gyro": {"available": true, "channel_pair": "|w|", "n_samples": 3960004, "lag_s": -2.29229, "r": -0.00171, "median_coherence": 0.00029, "coherence_significance": 0.00113, "coherence_significant": false, "method": "common 100.000 Hz grid, normalised cross-correlation, Welch coherence"}, "sound_vs_vibration": {"upstairs": {"available": true, "r_dB_vs_aT": 0.01687, "lag_s": -0.1305, "lag_r": 0.01828, "loud_seconds": 0.0, "vibration_seconds": 6.74, "both_seconds": 0.0, "sound_without_vibration_seconds": 0.0, "vibration_without_sound_seconds": 6.74, "method": "excursions beyond median + 6 robust sigma in each channel"}, "downstairs": {"available": true, "r_dB_vs_aT": 0.01582, "lag_s": -0.056, "lag_r": 0.01695, "loud_seconds": 2.43, "vibration_seconds": 4.42, "both_seconds": 0.22, "sound_without_vibration_seconds": 2.21, "vibration_without_sound_seconds": 4.2, "method": "excursions beyond median + 6 robust sigma in each channel"}}, "n_matched_pairs": 4},"experiments":{"available": false, "file_present": false, "entries": [], "path": "B:\\Downs\\linear\\json\\answers\\experiments.json", "n": 0, "schema": "shake-atlas/experiments/v1", "updated_utc": null, "notes": [], "version": 1},"experiment_comparison":{"available": false, "n_experiments": 0, "by_type": {}, "swap_test": {"available": false, "runs": [], "n_legs": 0, "verdict": "INSUFFICIENT_DATA", "evidence": ["no phone_swap_a / phone_swap_b experiments are recorded"], "legs": {"a": [], "b": []}, "method": "Each leg must contain the pair of simultaneous recordings (one per phone). Levels are the site RMS (falling back to peak). With dA = leg A log-ratio (phone1 upstairs / phone2 downstairs) and dB = leg B log-ratio (phone1 downstairs / phone2 upstairs), floor_effect = (dA + dB)/2 does NOT reverse when the phones move and device_effect = (dA - dB)/2 DOES reverse. The larger of the two above the detection floor decides the verdict.", "notes": ["record both legs of the swap test to obtain any verdict at all"], "detect_db": 3.0, "caveats": ["2 legs (one A, one B) is weak evidence: there is no independent repeat of either leg.", "A difference at or below about 3 dB is treated as at the detection floor and is not ranked.", "Same model but separate units: case, mounting, surface coupling and orientation may differ."]}, "on_off_contrasts": [], "interpretation_limits": ["A labelled experiment establishes only that the recorded vibration changed between the two windows.", "A passive recording alone cannot identify HVAC, pumps, fans, fridges, washers, dryers or traffic: correlated bands are hypotheses, not equipment identities.", "A single run is not a controlled experiment. Without a repeat, run-to-run variation and drift in the source cannot be separated from the effect being tested.", "Two phones of the same model are separate physical units: accelerometer calibration, case, mounting, surface coupling and orientation can differ enough to mimic a real effect (see config.SAME_MODEL_CAVEAT).", "Nothing here proves an equipment fault, a structural defect, a code violation, or a health risk.", "Amplification measured between two sites in one house does not generalise to other rooms, other houses, or other times of year.", "The phone-swap test is the strongest test available here, but 2 legs (one A, one B) is weak evidence: it gives a single estimate of the floor effect with no independent repeat.", "Amplitude or event-count differences cannot decide the physical path (structure-borne vs air-borne) or the source location.", "Frequency statements cannot exceed fmax_safe_hz = 0.45 * fs_common of the recordings involved."], "notes": ["no labelled experiments in this bundle; record some with --experiment 'name=type@stem:start-end' and see experiment_protocol()"], "schema": "shake-atlas/experiments/v1", "updated_utc": null, "data_availability": {"sites": 2, "sessions": 1, "note": "sites/sessions are optional: with none, the comparison reports labels and windows only"}},"next_experiment":{"available": true, "summary": "no reproducible cross-floor vibration was found in the passive recording; next perform a labelled impulse test and the phone-swap test", "primary": {"experiment": "known impulse test (labelled tap/drop at known locations)", "type": "impulse", "why": "the passive recording holds no excitation above the sensor noise floor, so there is nothing for the structure to transmit; a known, repeated impulse is the cheapest way to create a signal both phones must record if they are mechanically coupled", "steps": ["lay both phones flat on their floors, screens still, not on carpet", "note the UTC time to the second immediately before each tap", "tap firmly on the floor next to the upstairs phone: 10 taps, 5 s apart", "repeat the 10 taps next to the downstairs phone", "repeat both series with a heavier impulse (dropped book)"], "duration": "10-15 min", "labels": "tap_up=impulse@<upstairs-stem>:<start>-<end>,tap_down=impulse@<downstairs-stem>:<start>-<end>", "success_criterion": "every impulse becomes a matched pair with a stable onset offset and SNR > 10 dB on both phones; upstairs taps that never reach the downstairs phone are themselves a strong negative result"}, "alternates": [{"experiment": "phone-swap test (same sequence, phones exchanged)", "type": "phone_swap_a", "why": "with a real excitation present, swapping the phones separates a floor response from a unit/coupling sensitivity difference - the single most valuable control for any amplification claim", "steps": ["run A: phone 1 upstairs, phone 2 downstairs, repeat the tap series", "run B: swap the phones and repeat the identical tap series", "keep cases, orientation and surface identical between legs"], "duration": "2 legs x 10-15 min", "labels": "swapA=phone_swap_a@<stem1>+<stem2>,swapB=phone_swap_b@<stem2>+<stem1>", "success_criterion": "the upstairs/downstairs ratio follows the FLOOR rather than the PHONE across the two legs"}, {"experiment": "quiet baseline, then HVAC on/off", "type": "hvac_on", "why": "establishes the noise floor of each unit and whether the largest ambient contribution in this band is equipment-driven", "steps": ["30 min quiet baseline with the HVAC off", "then 30 min with the HVAC forced on", "note the UTC switch times"], "duration": "2 x 30 min", "labels": "base=quiet_baseline@<stem>,hvac=hvac_on@<stem>:<start>-<end>", "success_criterion": "a reproducible difference in band RMS or event rate between the two labelled windows"}, {"experiment": "repeat a passive run without touching the phones", "type": "quiet_baseline", "why": "some recordings are dominated by rare samples (handling, start/stop artefacts), so their large plain-RMS values do not describe continuous vibration; a hands-off repeat confirms that", "steps": ["start the recording, lay the phone down flat, do not touch it again", "stop it only at the very end from the app"], "duration": "1 h", "labels": "baseline=quiet_baseline@<stem>", "success_criterion": "plain RMS and 99.9%-trimmed RMS agree within 1.5x, i.e. no handling spikes"}], "rationale_evidence": ["0 matched event pairs; median coherence 0.0003 against a 0.0011 significance level; |r| = 0.028; no bin survives FDR control", "5 single-site detection(s) (3 upstairs / 2 downstairs) with no counterpart inside the matching tolerance", "plain RMS is spike-dominated on: downstairs, upstairs"], "current_state": {"sessions_analysed": 1, "paired_labels": ["upstairs", "downstairs"], "matched_pairs": 0, "detections": {"upstairs": 3, "downstairs": 2}, "median_coherence": "0.0003", "coherence_significance": "0.0011", "bins_surviving_fdr": 0, "individual_bins_established": false, "coherence_verdict": "no bin survives FDR control", "corrected_correlation": "0.0282", "shared_signal_established": false, "median_spectral_gain_db": "0.52", "candidate_regions": 0, "spike_dominated_recordings": ["downstairs", "upstairs"]}, "reduces_uncertainty_about": "whether any vibration crosses between the floors at all (impulse test) and whether an observed difference belongs to the floor or to the phone (swap)", "protocol_path": "answers/experiment-protocol.md", "n_existing_experiments": 0, "note": "a recommendation ranked from the evidence of this run, not a result; each entry states its success criterion so the next analysis can settle it"},"outlier_profile":{"upstairs": "plain RMS is dominated by rare samples, not by continuous vibration: for aT the top 0.01% of samples carry 98.43% of the total energy, so the plain RMS 0.052956 m/s^2 collapses to 0.005635 m/s^2 once samples above the 99.9th percentile are removed (9.4x), while the robust sigma is 0.003336 m/s^2 and the 1 s background is the right measure of continuous motion", "downstairs": "plain RMS is dominated by rare samples, not by continuous vibration: for aT the top 0.01% of samples carry 98.85% of the total energy, so the plain RMS 0.043734 m/s^2 collapses to 0.004657 m/s^2 once samples above the 99.9th percentile are removed (9.4x), while the robust sigma is 0.002748 m/s^2 and the 1 s background is the right measure of continuous motion"},"self_tests":null,"status_counts":{"unsupported": 8, "insufficient_data": 8, "tentative": 30, "supported": 4},"spectral_limits":{"fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "fs_common_hz": 100.000095, "freq_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "coverage_s": 39600.0, "sessions": 1, "per_site_fmax_safe_hz": {"upstairs": [45.000043], "downstairs": [45.000043]}},"answer_order":[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50],"answers":{"1": {"question": "What vibration events occurred at essentially the same time on both phones?", "measured": "No matched event. The two phones overlapped for 11.000 h; 3 upstairs and 2 downstairs detections were found, and no upstairs detection had an independent downstairs detection within 1.5 s. Detections that do not pair up are reported as unmatched, not as shared events.", "interpretation": "There is no coincident set to interpret: no detection on one phone has a counterpart on the other inside the 1.5 s tolerance, so this run contains no evidence of a shared excitation. The correct reading is \"nothing matched\", not \"nothing was looked at\": 5 single-site detection(s) were examined and rejected as pairs.", "not_established": "Coincidence within 1.5 s does not identify a shared source, a room of origin or the equipment involved, and it does not by itself show that the two phones recorded the same physical event; that needs a labelled or triggered test.", "evidence": {"overlap": {"available": true, "start_unix": 1790985600.0, "end_unix": 1791025200.0, "start_iso_utc": "2026-10-03T00:00:00.000Z", "end_iso_utc": "2026-10-03T11:00:00.000Z", "duration_s": 39600.0, "duration_h": 11.0, "both_clocks_absolute": true, "window_applied": true, "alignment": "UTC hour grid, no clock shift"}, "event_matching": {"tolerance_s": 1.5, "near_tolerance_s": 5.0, "n_a": 0, "n_b": 0, "n_matched": 0, "n_unmatched_up": 0, "n_unmatched_down": 0, "matched_up_indices": [], "matched_down_indices": [], "unmatched_up_indices": [], "unmatched_down_indices": [], "closest_pair_s": null, "offset_s_median": null, "offset_s_mad": null, "offset_s_quantiles": null, "note": "a match means both sites had an independent detection inside the tolerance window; unmatched detections are reported as such, and threshold differences make weak shared events look one-sided", "upstairs_events": 0, "downstairs_events": 0, "events_window": "only detections with onset inside the analysed window are matched", "matched_pairs": 0, "unmatched_upstairs": 0, "unmatched_downstairs": 0}, "first_20_pairs": []}, "method": "per-phone envelope detection, then matching of real detection index sets across the common UTC overlap with a 1.5 s tolerance", "confidence": "high for the onset pairing; see caveats", "caveats": ["UTC clocks come from the two phones; the match tolerance absorbs any clock offset.", "A match means \"within 1.5 s\", not proof of a shared source."], "trust": {"status": "unsupported", "confidence": "high for the onset pairing; see caveats", "n_events": 5, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no matched event pairs within the tolerance", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: No matched event. The two phones overlapped for 11.000 h; 3 upstairs and 2 downstairs detections were found, and no upstairs detection had an independent downstairs detection within 1.5 s. Detections that do not pair up are reported as unmatched, not as shared events.\nINTERPRETATION: There is no coincident set to interpret: no detection on one phone has a counterpart on the other inside the 1.5 s tolerance, so this run contains no evidence of a shared excitation. The correct reading is \"nothing matched\", not \"nothing was looked at\": 5 single-site detection(s) were examined and rejected as pairs.\nNOT ESTABLISHED: Coincidence within 1.5 s does not identify a shared source, a room of origin or the equipment involved, and it does not by itself show that the two phones recorded the same physical event; that needs a labelled or triggered test.\nTRUST: unsupported (no matched event pairs within the tolerance)"}, "2": {"question": "Which events appeared only upstairs and which appeared only downstairs?", "measured": "Upstairs: 3 detections, 0 of them unpaired upstairs-only. Downstairs: 2 detections, 0 unpaired downstairs-only. 0 pairs matched within 1.5 s.", "interpretation": "The unmatched sets are the real set difference of the two match index sets, so an \"only\" event is one that rose above one phone's detector threshold and not above the other's at that moment.", "not_established": "An unmatched detection does not establish that the source was local to that floor; it can be a genuinely local source, a site-specific sensitivity difference, or a shared event that stayed below the other phone's detector threshold.", "evidence": {"unmatched_up_indices": [], "unmatched_down_indices": [], "upstairs_only_examples": [], "downstairs_only_examples": [], "match_tolerance_s": 1.5, "note": "the examples come from the unmatched index sets, never from a positional slice of the detection list"}, "method": "same detector configuration on both sites; unmatched detections are the complement of the matched index sets", "confidence": "medium", "caveats": ["Detection thresholds are per-site, so a weak shared event can look unpaired. Compare the per-pair ratios (Q4) before calling an event local."], "trust": {"status": "unsupported", "confidence": "medium", "n_events": 5, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no matched event pairs within the tolerance", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Upstairs: 3 detections, 0 of them unpaired upstairs-only. Downstairs: 2 detections, 0 unpaired downstairs-only. 0 pairs matched within 1.5 s.\nINTERPRETATION: The unmatched sets are the real set difference of the two match index sets, so an \"only\" event is one that rose above one phone's detector threshold and not above the other's at that moment.\nNOT ESTABLISHED: An unmatched detection does not establish that the source was local to that floor; it can be a genuinely local source, a site-specific sensitivity difference, or a shared event that stayed below the other phone's detector threshold.\nTRUST: unsupported (no matched event pairs within the tolerance)"}, "3": {"question": "For simultaneous events, which phone recorded the larger acceleration amplitude?", "measured": "No matched event pair carries a usable peak amplitude on both floors, so there is no simultaneous event to compare.", "interpretation": "Not applicable: there is no simultaneous pair, so no statement about the relative peak amplitude across the two floors can be made from this run. Reporting a \"direction\" here would require inventing a coincidence that the detector did not find.", "not_established": "A peak amplitude is set by a single sample, by each unit's calibration and mounting, and by the event window; the direction therefore does not establish that the floor itself amplifies, and a magnitude claim needs a labelled on/off test with the phones swapped.", "evidence": {"amplification_summary": {"available": false, "n_pairs": 0, "verdict": "INSUFFICIENT MATCHED EVENTS", "verdict_reason": "fewer than 4 matched events carry a usable amplitude ratio, so the direction of amplification cannot be established", "decision_rule": "UPSTAIRS/DOWNSTAIRS SUPPORTED requires >=4 matched events, a bootstrap CI that excludes 1.0 and a median ratio outside 0.8-1.25; anything else is NO CLEAR DIRECTION", "note_no_excitation": "without a shared event there is no excitation to amplify, so all-time ratios measure the phones and their mounting, not the building"}, "peak_ratio_stats": null, "pairs": []}, "method": "peak |a| of the resultant acceleration inside each matched event window", "confidence": null, "caveats": ["Peak amplitude is sensitive to a single sample; the RMS ratio in the same table is the more stable statistic.", "the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"], "trust": {"status": "unsupported", "confidence": "low", "n_events": null, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no matched event pairs", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: No matched event pair carries a usable peak amplitude on both floors, so there is no simultaneous event to compare.\nINTERPRETATION: Not applicable: there is no simultaneous pair, so no statement about the relative peak amplitude across the two floors can be made from this run. Reporting a \"direction\" here would require inventing a coincidence that the detector did not find.\nNOT ESTABLISHED: A peak amplitude is set by a single sample, by each unit's calibration and mounting, and by the event window; the direction therefore does not establish that the floor itself amplifies, and a magnitude claim needs a labelled on/off test with the phones swapped.\nTRUST: unsupported (no matched event pairs)"}, "4": {"question": "What is the upstairs/downstairs amplitude ratio for every significant event?", "measured": "Per-event ratios are tabulated for 0 matched pairs (peak and RMS upstairs/downstairs). Summary: median peak ratio not available, median RMS ratio not available, fraction above 1 not available.", "interpretation": "Each matched pair has its own ratio, so the answer is a distribution rather than a single number; the spread shows how consistent the floor-to-floor relationship is.", "not_established": "Ratios exist only for events that matched within 1.5 s and cleared both detectors, so events below either noise floor or outside the overlap are not represented; the ratios also carry each unit's calibration and mounting.", "evidence": {"pairs": [], "summary": {"peak": null, "rms": null}, "onset_offsets_available": false}, "method": "peak_aT and rms_aT inside each matched event window, ratio taken as upstairs / downstairs", "confidence": null, "caveats": ["the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"], "trust": {"status": "unsupported", "confidence": "low", "n_events": null, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no matched event pairs", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Per-event ratios are tabulated for 0 matched pairs (peak and RMS upstairs/downstairs). Summary: median peak ratio not available, median RMS ratio not available, fraction above 1 not available.\nINTERPRETATION: Each matched pair has its own ratio, so the answer is a distribution rather than a single number; the spread shows how consistent the floor-to-floor relationship is.\nNOT ESTABLISHED: Ratios exist only for events that matched within 1.5 s and cleared both detectors, so events below either noise floor or outside the overlap are not represented; the ratios also carry each unit's calibration and mounting.\nTRUST: unsupported (no matched event pairs)"}, "5": {"question": "Does the upper floor consistently amplify vibration relative to the first floor?", "measured": "Verdict: INSUFFICIENT MATCHED EVENTS. Only 0 matched event pairs carry an amplitude ratio on both floors; the decision rule needs at least 4.", "interpretation": "The conclusion is taken from statistics only: the median peak and RMS ratios, the fraction of pairs above 1, the bootstrap confidence interval of the median and the two-sided sign test. \"INSUFFICIENT MATCHED EVENTS\" means the evidence is not strong enough to claim a direction, not that the floors are identical.", "not_established": "Even a supported direction does not establish the magnitude of structural amplification, because the two phones are separate physical units; a magnitude claim needs a labelled on/off test (and ideally a phone swap) so unit sensitivity can be separated from the floor.", "evidence": {"verdict": "INSUFFICIENT MATCHED EVENTS", "session_verdict": "INSUFFICIENT MATCHED EVENTS", "questions_recomputed_verdict": "INSUFFICIENT MATCHED EVENTS", "peak_ratio_stats": null, "rms_ratio_stats": null, "amplification_summary": {"available": false, "n_pairs": 0, "verdict": "INSUFFICIENT MATCHED EVENTS", "verdict_reason": "fewer than 4 matched events carry a usable amplitude ratio, so the direction of amplification cannot be established", "decision_rule": "UPSTAIRS/DOWNSTAIRS SUPPORTED requires >=4 matched events, a bootstrap CI that excludes 1.0 and a median ratio outside 0.8-1.25; anything else is NO CLEAR DIRECTION", "note_no_excitation": "without a shared event there is no excitation to amplify, so all-time ratios measure the phones and their mounting, not the building"}, "axis_amplification": {"per_site_rms_ms2": {"upstairs": {"ax": 0.023906698, "ay": 0.028106796, "az": 0.039653176, "vertical_signed": 0.040582906, "horizontal": 0.036737308, "resultant": 0.054741229}, "downstairs": {"ax": 0.032926342, "ay": 0.016962163, "az": 0.025835878, "vertical_signed": 0.025923697, "horizontal": 0.037009586, "resultant": 0.045185701}}, "upstairs_over_downstairs": {"az": 1.5348, "horizontal": 0.9926, "resultant": 1.2115, "ax": 0.7261, "vertical_signed": 1.5655, "ay": 1.657}, "comparable_directions": ["vertical_signed", "horizontal", "resultant"], "note": "only gravity-aligned directions are physically comparable across the two phones; body-frame axes are reported per phone only", "spectral_ratio_median_gain_db": 0.5158}, "spectral_ratio_median": 1.12611}, "method": "matched-pair ratios only: median peak and RMS ratios, fraction above 1, bootstrap 95% CI of the median (util.bootstrap_ci) and two-sided sign test (util.sign_test_p); fewer than 4 pairs returns INSUFFICIENT MATCHED EVENTS", "confidence": "medium", "caveats": ["the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ", "Without a shared event there is no excitation to amplify, so all-time ratios would measure the phones rather than the building."], "trust": {"status": "insufficient_data", "confidence": "medium", "n_events": null, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "fewer than 4 matched pairs", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Verdict: INSUFFICIENT MATCHED EVENTS. Only 0 matched event pairs carry an amplitude ratio on both floors; the decision rule needs at least 4.\nINTERPRETATION: The conclusion is taken from statistics only: the median peak and RMS ratios, the fraction of pairs above 1, the bootstrap confidence interval of the median and the two-sided sign test. \"INSUFFICIENT MATCHED EVENTS\" means the evidence is not strong enough to claim a direction, not that the floors are identical.\nNOT ESTABLISHED: Even a supported direction does not establish the magnitude of structural amplification, because the two phones are separate physical units; a magnitude claim needs a labelled on/off test (and ideally a phone swap) so unit sensitivity can be separated from the floor.\nTRUST: insufficient_data (fewer than 4 matched pairs)"}, "6": {"question": "Are there particular vibration frequencies that are substantially stronger upstairs?", "measured": "Median upstairs/downstairs PSD ratio 1.126 (0.52 dB). Strongest upstairs bins (gated on both sites being above their own floor): 3.67 Hz (x1.31); 4.9 Hz (x1.28); 1.87 Hz (x1.26); 3.23 Hz (x1.26); 9.7 Hz (x1.25); 0.93 Hz (x1.25); 6.07 Hz (x1.25); 14.53 Hz (x1.25); 5.2 Hz (x1.25); 4.87 Hz (x1.24). Strongest downstairs bins for contrast: not available. Gated regions with |median gain| > 3 dB: not available.", "interpretation": "The continuous comparison is the useful part: the upstairs channel carries about 1.13x the downstairs power across the whole usable band (0.52 dB), and the strongest upstairs-dominant bin reaches only about 1.31x. A bin a few percent above equality is a candidate frequency-dependent difference; with 0 gated region(s) above 3 dB it is not a structural amplification signature.", "not_established": "A bin ratio above 1 does not establish that the upper floor responds more strongly at that frequency: a flat ratio offset is a unit sensitivity and mounting difference, and a genuine structural peak cannot be separated from a phone/surface coupling resonance without a swap test or a labelled source.", "evidence": {"spectral_ratio": {"curve": {"freqs_hz": [0.0, 0.0333, 0.0667, 0.1, 0.1333, 0.1667, 0.2, 0.2333, 0.2667, 0.3, 0.3333, 0.3667, 0.4, 0.4333, 0.4667, 0.5, 0.5333, 0.5667, 0.6, 0.6333, 0.6667, 0.7, 0.7333, 0.7667, 0.8, 0.8333, 0.8667, 0.9, 0.9333, 0.9667, 1.0, 1.0333, 1.0667, 1.1, 1.1333, 1.1667, 1.2, 1.2333, 1.2667, 1.3, 1.3333, 1.3667, 1.4, 1.4333, 1.4667, 1.5, 1.5333, 1.5667, 1.6, 1.6333, 1.6667, 1.7, 1.7333, 1.7667, 1.8, 1.8333, 1.8667, 1.9, 1.9333, 1.9667, 2.0, 2.0333, 2.0667, 2.1, 2.1333, 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false, false]}, "direction": "P_upstairs / P_downstairs", "median_ratio": 1.12611, "median_gain_db": 0.5158, "upstairs_noise_floor_psd": 8.2331136e-07, "downstairs_noise_floor_psd": 7.2517593e-07, "gated_bin_fraction": 0.4907, "regions": [], "regions_note": "frequency regions are only reported where BOTH sites are above their own noise floor; a large ratio against a near-zero denominator is not evidence of anything", "method": "Welch PSD of the signed vertical channel over the shared window, 30 s segments; ratio computed bin by bin and gated on both sites being above their own median PSD", "upstairs_psd_median": 8.2331136e-07, "downstairs_psd_median": 7.2517593e-07}, "regions": null, "upstairs_lines": {"available": true, "lines": [], "noise_floor_median_psd": 1.208563e-06, "noise_floor_sigma_psd": 1.22807e-07, "detection_threshold_psd": 2.191017e-06, "interpretation_caveat": "these are band-based hypotheses for equipment classes, not identifications of specific devices; a definitive call needs a labelled on/off test"}, "downstairs_lines": {"available": true, "lines": [], "noise_floor_median_psd": 1.059216e-06, "noise_floor_sigma_psd": 7.4031e-08, "detection_threshold_psd": 1.651462e-06, "interpretation_caveat": "these are band-based hypotheses for equipment classes, not identifications of specific devices; a definitive call needs a labelled on/off test"}, "noise_floor_gated": 0.4907}, "method": "Welch PSD of the signed/derived channels on the common grid over the overlap, ratio of medians per frequency bin where both sites are above their noise floor", "confidence": "medium-high", "caveats": ["the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ", "A ratio computed at a bin where either site is at its noise floor is not a measurement."], "trust": {"status": "tentative", "confidence": "medium-high", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "frequency resolution", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"noise_floor_gating": null, "n_segments": 2639.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "spectral_ratio_median", "value_hz": 1.1261}, {"claim": "upstairs_strong_bin_1", "value_hz": 3.6667}, {"claim": "upstairs_strong_bin_2", "value_hz": 4.9}, {"claim": "upstairs_strong_bin_3", "value_hz": 1.8667}, {"claim": "upstairs_strong_bin_4", "value_hz": 3.2333}, {"claim": "upstairs_strong_bin_5", "value_hz": 9.7}], "violations": []}}, "short_answer": "MEASURED: Median upstairs/downstairs PSD ratio 1.126 (0.52 dB). Strongest upstairs bins (gated on both sites being above their own floor): 3.67 Hz (x1.31); 4.9 Hz (x1.28); 1.87 Hz (x1.26); 3.23 Hz (x1.26); 9.7 Hz (x1.25); 0.93 Hz (x1.25); 6.07 Hz (x1.25); 14.53 Hz (x1.25); 5.2 Hz (x1.25); 4.87 Hz (x1.24). Strongest downstairs bins for contrast: not available. Gated regions with |median gain| > 3 dB: not available.\nINTERPRETATION: The continuous comparison is the useful part: the upstairs channel carries about 1.13x the downstairs power across the whole usable band (0.52 dB), and the strongest upstairs-dominant bin reaches only about 1.31x. A bin a few percent above equality is a candidate frequency-dependent difference; with 0 gated region(s) above 3 dB it is not a structural amplification signature.\nNOT ESTABLISHED: A bin ratio above 1 does not establish that the upper floor responds more strongly at that frequency: a flat ratio offset is a unit sensitivity and mounting difference, and a genuine structural peak cannot be separated from a phone/surface coupling resonance without a swap test or a labelled source."}, "7": {"question": "What are the dominant resonant frequencies measured at each location?", "measured": "upstairs: dominant not available (source csv/multi_1791026911.329183 2.csv; top peaks not available) downstairs: dominant not available (source csv/multi_1791027086.65238.csv; top peaks not available)", "interpretation": "The dominant frequency is the strongest PSD peak of each site's own recording; it is the frequency that carries most energy at that location.", "not_established": "The dominant peak is often a phone/surface contact resonance rather than a building mode, so the measurement does not establish a structural resonant frequency at either location.", "evidence": {"upstairs": {"spectrum": {"n_blocks": 74, "channel": "aVert", "peaks": [], "centroid_hz": 21.22, "strongest_bins": [{"freq_hz": 41.0, "psd": 2.199605e-06, "prominence": 1.33495e-06, "ratio_to_median": 1.82}, {"freq_hz": 37.8667, "psd": 2.020476e-06, "prominence": 1.070345e-06, "ratio_to_median": 1.672}, {"freq_hz": 42.1334, "psd": 1.549819e-06, "prominence": 7.0347e-07, "ratio_to_median": 1.282}], "peak_gate_ratio_to_median": 3.0, "peak_gate_note": "a peak must exceed 3x the median PSD of its own recording; a smaller maximum is simply the highest bin of the noise floor and is reported under strongest_bins instead of as a dominant frequency", "total_rms_ms2": 0.007209853, "method": "Welch PSD averaged over 600 s blocks, 30 s segments, 50% overlap", "note": "spectrum of the signed gravity-aligned vertical channel; content above 45.0 Hz is not usable at this sample rate"}, "bands": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 2.68727e-07, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.000518389, "fraction": 0.00519}, "0.5-1 Hz": {"power": 6.23567e-07, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.000789662, "fraction": 0.01205}, "1-2 Hz": {"power": 1.281386e-06, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.001131983, "fraction": 0.02477}, "2-4 Hz": {"power": 2.547237e-06, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.001596006, "fraction": 0.04924}, "4-8 Hz": {"power": 5.135895e-06, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002266251, "fraction": 0.09928}, "8-16 Hz": {"power": 1.0158585e-05, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.003187253, "fraction": 0.19638}, "16-32 Hz": {"power": 1.8966732e-05, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.004355081, "fraction": 0.36665}, "32-64 Hz": {"power": 1.2747203e-05, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.003570323, "fraction": 0.24642}}, "total_power": 5.1729332e-05, "total_rms_ms2": 0.007192311, "fmax_hz": 45.0}, "dominant_hz": null, "events": 3, "source_file": "csv/multi_1791026911.329183 2.csv"}, "downstairs": {"spectrum": {"n_blocks": 74, "channel": "aVert", "peaks": [], "centroid_hz": 21.2, "strongest_bins": [], "peak_gate_ratio_to_median": 3.0, "peak_gate_note": "a peak must exceed 3x the median PSD of its own recording; a smaller maximum is simply the highest bin of the noise floor and is reported under strongest_bins instead of as a dominant frequency", "total_rms_ms2": 0.006732347, "method": "Welch PSD averaged over 600 s blocks, 30 s segments, 50% overlap", "note": "spectrum of the signed gravity-aligned vertical channel; content above 45.0 Hz is not usable at this sample rate"}, "bands": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 2.46252e-07, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.000496238, "fraction": 0.00546}, "0.5-1 Hz": {"power": 5.59767e-07, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.000748176, "fraction": 0.01241}, "1-2 Hz": {"power": 1.161331e-06, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.00107765, "fraction": 0.02575}, "2-4 Hz": {"power": 2.183987e-06, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.001477832, "fraction": 0.04842}, "4-8 Hz": {"power": 4.405378e-06, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002098899, "fraction": 0.09767}, "8-16 Hz": {"power": 8.759576e-06, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002959658, "fraction": 0.19421}, "16-32 Hz": {"power": 1.6834269e-05, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.004102959, "fraction": 0.37324}, "32-64 Hz": {"power": 1.095284e-05, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.003309507, "fraction": 0.24284}}, "total_power": 4.5103399e-05, "total_rms_ms2": 0.006715906, "fmax_hz": 45.0}, "dominant_hz": null, "events": 2, "source_file": "csv/multi_1791027086.65238.csv"}}, "method": "Welch PSD of the resultant acceleration with the recorded sample rate; peaks ranked by power, restricted to the usable band", "confidence": null, "caveats": ["With a phone lying on a surface, the dominant peak is often a phone/surface contact resonance rather than a building mode.", "the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"], "trust": {"status": "tentative", "confidence": "medium", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no analysed upstairs/downstairs session", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "evidence.upstairs.spectrum.centroid_hz", "value_hz": 21.22}, {"claim": "evidence.upstairs.spectrum.strongest_bins[0].freq_hz", "value_hz": 41.0}, {"claim": "evidence.upstairs.spectrum.strongest_bins[1].freq_hz", "value_hz": 37.8667}, {"claim": "evidence.upstairs.spectrum.strongest_bins[2].freq_hz", "value_hz": 42.1334}, {"claim": "evidence.upstairs.bands.bands.0.25-0.5 Hz.f_lo_hz", "value_hz": 0.25}, {"claim": "evidence.upstairs.bands.bands.0.25-0.5 Hz.f_hi_hz", "value_hz": 0.5}, {"claim": "evidence.upstairs.bands.bands.0.5-1 Hz.f_lo_hz", "value_hz": 0.5}, {"claim": "evidence.upstairs.bands.bands.0.5-1 Hz.f_hi_hz", "value_hz": 1.0}, {"claim": "evidence.upstairs.bands.bands.1-2 Hz.f_lo_hz", "value_hz": 1.0}, {"claim": "evidence.upstairs.bands.bands.1-2 Hz.f_hi_hz", "value_hz": 2.0}, {"claim": "evidence.upstairs.bands.bands.2-4 Hz.f_lo_hz", "value_hz": 2.0}, {"claim": "evidence.upstairs.bands.bands.2-4 Hz.f_hi_hz", "value_hz": 4.0}, {"claim": "evidence.upstairs.bands.bands.4-8 Hz.f_lo_hz", "value_hz": 4.0}, {"claim": "evidence.upstairs.bands.bands.4-8 Hz.f_hi_hz", "value_hz": 8.0}, {"claim": "evidence.upstairs.bands.bands.8-16 Hz.f_lo_hz", "value_hz": 8.0}, {"claim": "evidence.upstairs.bands.bands.8-16 Hz.f_hi_hz", "value_hz": 16.0}, {"claim": "evidence.upstairs.bands.bands.16-32 Hz.f_lo_hz", "value_hz": 16.0}, {"claim": "evidence.upstairs.bands.bands.16-32 Hz.f_hi_hz", "value_hz": 32.0}, {"claim": "evidence.upstairs.bands.bands.32-64 Hz.f_lo_hz", "value_hz": 32.0}, {"claim": "evidence.upstairs.bands.bands.32-64 Hz.f_hi_hz", "value_hz": 45.0}, {"claim": "evidence.downstairs.spectrum.centroid_hz", "value_hz": 21.2}, {"claim": "evidence.downstairs.bands.bands.0.25-0.5 Hz.f_lo_hz", "value_hz": 0.25}, {"claim": "evidence.downstairs.bands.bands.0.25-0.5 Hz.f_hi_hz", "value_hz": 0.5}, {"claim": "evidence.downstairs.bands.bands.0.5-1 Hz.f_lo_hz", "value_hz": 0.5}, {"claim": "evidence.downstairs.bands.bands.0.5-1 Hz.f_hi_hz", "value_hz": 1.0}, {"claim": "evidence.downstairs.bands.bands.1-2 Hz.f_lo_hz", "value_hz": 1.0}, {"claim": "evidence.downstairs.bands.bands.1-2 Hz.f_hi_hz", "value_hz": 2.0}, {"claim": "evidence.downstairs.bands.bands.2-4 Hz.f_lo_hz", "value_hz": 2.0}, {"claim": "evidence.downstairs.bands.bands.2-4 Hz.f_hi_hz", "value_hz": 4.0}, {"claim": "evidence.downstairs.bands.bands.4-8 Hz.f_lo_hz", "value_hz": 4.0}, {"claim": "evidence.downstairs.bands.bands.4-8 Hz.f_hi_hz", "value_hz": 8.0}, {"claim": "evidence.downstairs.bands.bands.8-16 Hz.f_lo_hz", "value_hz": 8.0}, {"claim": "evidence.downstairs.bands.bands.8-16 Hz.f_hi_hz", "value_hz": 16.0}, {"claim": "evidence.downstairs.bands.bands.16-32 Hz.f_lo_hz", "value_hz": 16.0}, {"claim": "evidence.downstairs.bands.bands.16-32 Hz.f_hi_hz", "value_hz": 32.0}, {"claim": "evidence.downstairs.bands.bands.32-64 Hz.f_lo_hz", "value_hz": 32.0}, {"claim": "evidence.downstairs.bands.bands.32-64 Hz.f_hi_hz", "value_hz": 45.0}, {"claim": "evidence.upstairs.spectrum.centroid_hz", "value_hz": 21.22}, {"claim": "evidence.upstairs.spectrum.strongest_bins[0].freq_hz", "value_hz": 41.0}, {"claim": "evidence.upstairs.spectrum.strongest_bins[1].freq_hz", "value_hz": 37.8667}], "violations": []}}, "short_answer": "MEASURED: upstairs: dominant not available (source csv/multi_1791026911.329183 2.csv; top peaks not available) downstairs: dominant not available (source csv/multi_1791027086.65238.csv; top peaks not available)\nINTERPRETATION: The dominant frequency is the strongest PSD peak of each site's own recording; it is the frequency that carries most energy at that location.\nNOT ESTABLISHED: The dominant peak is often a phone/surface contact resonance rather than a building mode, so the measurement does not establish a structural resonant frequency at either location."}, "8": {"question": "Are the dominant frequencies the same upstairs and downstairs?", "measured": "Dominant frequency unavailable at one or both locations (upstairs not available, downstairs not available).", "interpretation": "Comparing the ranked peak lists says whether the two floors peak at the same frequency bin or at different frequencies; agreement in one bin is weak evidence for a shared mode.", "not_established": "A shared physical mode can appear at slightly different bins because the two units have separate calibration and sensor bandwidth, and a single dominant bin cannot establish that a common structural mode exists.", "evidence": {"upstairs_peaks": [], "downstairs_peaks": [], "upstairs_dominant_hz": null, "downstairs_dominant_hz": null, "bin_hz": 0.033333}, "method": "comparison of the ranked PSD peak lists (Q7) at the common frequency resolution", "confidence": null, "caveats": ["the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"], "trust": {"status": "tentative", "confidence": "medium", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no analysed upstairs/downstairs session", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Dominant frequency unavailable at one or both locations (upstairs not available, downstairs not available).\nINTERPRETATION: Comparing the ranked peak lists says whether the two floors peak at the same frequency bin or at different frequencies; agreement in one bin is weak evidence for a shared mode.\nNOT ESTABLISHED: A shared physical mode can appear at slightly different bins because the two units have separate calibration and sensor bandwidth, and a single dominant bin cannot establish that a common structural mode exists."}, "9": {"question": "Are there frequencies that appear downstairs but disappear upstairs?", "measured": "Downstairs-dominant bins (upstairs/downstairs < 1): not available. Median ratio 1.126; 5th-95th percentile of the ratio 1.04 to 1.22.", "interpretation": "Bins where the downstairs PSD exceeds the upstairs one are candidate downstairs-dominant frequencies; the median ratio (1.13) and the percentile spread are the robust part of this comparison, while individual bins scatter by a factor of several on a noise floor and are not \"frequencies that disappear upstairs\".", "not_established": "\"Disappear\" here only means \"weaker at the same bin\", which is within the sensitivity spread of two separate units; a shared band can fall below one unit's noise floor, so a downstairs-only source is not established.", "evidence": {"spectral_ratio_down": [], "band_ratio": null, "median_ratio": 1.12611, "noise_floor_gated": null}, "method": "ratio of the two Welch PSDs on the common grid; bins where downstairs exceeds upstairs", "confidence": "medium", "caveats": ["the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ", "A ratio at the noise floor is not a measurement."], "trust": {"status": "tentative", "confidence": "medium", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "sensor noise floor", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"noise_floor_gated": null}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Downstairs-dominant bins (upstairs/downstairs < 1): not available. Median ratio 1.126; 5th-95th percentile of the ratio 1.04 to 1.22.\nINTERPRETATION: Bins where the downstairs PSD exceeds the upstairs one are candidate downstairs-dominant frequencies; the median ratio (1.13) and the percentile spread are the robust part of this comparison, while individual bins scatter by a factor of several on a noise floor and are not \"frequencies that disappear upstairs\".\nNOT ESTABLISHED: \"Disappear\" here only means \"weaker at the same bin\", which is within the sensitivity spread of two separate units; a shared band can fall below one unit's noise floor, so a downstairs-only source is not established."}, "10": {"question": "Are there frequencies that are weak downstairs but become strong upstairs?", "measured": "Upstairs-dominant bins (upstairs/downstairs > 1, both sites above their floor): 3.67 Hz (x1.31); 4.9 Hz (x1.28); 1.87 Hz (x1.26); 3.23 Hz (x1.26); 9.7 Hz (x1.25); 0.93 Hz (x1.25); 6.07 Hz (x1.25); 14.53 Hz (x1.25); 5.2 Hz (x1.25); 4.87 Hz (x1.24). Median ratio 1.126 (0.52 dB). Gated regions above 3 dB: not available.", "interpretation": "A frequency that is weak downstairs and strong upstairs would be the pattern expected from transmission up through the structure plus a floor-level response, so these bins are candidate frequency-dependent differences. Individual-bin verdict for this run: no bin survives FDR control. Even so, none of these bins is established as a transmission path until a controlled experiment (labelled source or phone swap) reproduces it.", "not_established": "The same bin pattern can be produced by phone coupling, mounting or unit calibration rather than the structure, so a structural transmission path is not established from the ratio alone.", "evidence": {"spectral_ratio_up": [{"freq_hz": 3.6667, "ratio": 1.305216}, {"freq_hz": 4.9, "ratio": 1.281026}, {"freq_hz": 1.8667, "ratio": 1.258162}, {"freq_hz": 3.2333, "ratio": 1.257395}, {"freq_hz": 9.7, "ratio": 1.253317}, {"freq_hz": 0.9333, "ratio": 1.250833}, {"freq_hz": 6.0667, "ratio": 1.249061}, {"freq_hz": 14.5333, "ratio": 1.247996}, {"freq_hz": 5.2, "ratio": 1.245446}, {"freq_hz": 4.8667, "ratio": 1.24454}], "regions": null, "median_gain_db": 0.5158, "gated_bin_fraction": 0.4907}, "method": "same ratio analysis as Q6/Q9, ranked from the upstairs-dominant side", "confidence": "medium", "caveats": ["the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"], "trust": {"status": "tentative", "confidence": "medium", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "frequency resolution", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "upstairs_strong_bin_1", "value_hz": 3.6667}, {"claim": "upstairs_strong_bin_2", "value_hz": 4.9}, {"claim": "upstairs_strong_bin_3", "value_hz": 1.8667}, {"claim": "upstairs_strong_bin_4", "value_hz": 3.2333}, {"claim": "upstairs_strong_bin_5", "value_hz": 9.7}, {"claim": "evidence.spectral_ratio_up[0].freq_hz", "value_hz": 3.6667}, {"claim": "evidence.spectral_ratio_up[1].freq_hz", "value_hz": 4.9}, {"claim": "evidence.spectral_ratio_up[2].freq_hz", "value_hz": 1.8667}, {"claim": "evidence.spectral_ratio_up[3].freq_hz", "value_hz": 3.2333}, {"claim": "evidence.spectral_ratio_up[4].freq_hz", "value_hz": 9.7}, {"claim": "evidence.spectral_ratio_up[5].freq_hz", "value_hz": 0.9333}, {"claim": "evidence.spectral_ratio_up[6].freq_hz", "value_hz": 6.0667}, {"claim": "evidence.spectral_ratio_up[7].freq_hz", "value_hz": 14.5333}, {"claim": "evidence.spectral_ratio_up[8].freq_hz", "value_hz": 5.2}, {"claim": "evidence.spectral_ratio_up[9].freq_hz", "value_hz": 4.8667}, {"claim": "evidence.spectral_ratio_up[0].freq_hz", "value_hz": 3.6667}, {"claim": "evidence.spectral_ratio_up[1].freq_hz", "value_hz": 4.9}, {"claim": "evidence.spectral_ratio_up[2].freq_hz", "value_hz": 1.8667}, {"claim": "evidence.spectral_ratio_up[3].freq_hz", "value_hz": 3.2333}, {"claim": "evidence.spectral_ratio_up[4].freq_hz", "value_hz": 9.7}, {"claim": "evidence.spectral_ratio_up[5].freq_hz", "value_hz": 0.9333}, {"claim": "evidence.spectral_ratio_up[6].freq_hz", "value_hz": 6.0667}, {"claim": "evidence.spectral_ratio_up[7].freq_hz", "value_hz": 14.5333}, {"claim": "evidence.spectral_ratio_up[8].freq_hz", "value_hz": 5.2}, {"claim": "evidence.spectral_ratio_up[9].freq_hz", "value_hz": 4.8667}], "violations": []}}, "short_answer": "MEASURED: Upstairs-dominant bins (upstairs/downstairs > 1, both sites above their floor): 3.67 Hz (x1.31); 4.9 Hz (x1.28); 1.87 Hz (x1.26); 3.23 Hz (x1.26); 9.7 Hz (x1.25); 0.93 Hz (x1.25); 6.07 Hz (x1.25); 14.53 Hz (x1.25); 5.2 Hz (x1.25); 4.87 Hz (x1.24). Median ratio 1.126 (0.52 dB). Gated regions above 3 dB: not available.\nINTERPRETATION: A frequency that is weak downstairs and strong upstairs would be the pattern expected from transmission up through the structure plus a floor-level response, so these bins are candidate frequency-dependent differences. Individual-bin verdict for this run: no bin survives FDR control. Even so, none of these bins is established as a transmission path until a controlled experiment (labelled source or phone swap) reproduces it.\nNOT ESTABLISHED: The same bin pattern can be produced by phone coupling, mounting or unit calibration rather than the structure, so a structural transmission path is not established from the ratio alone."}, "11": {"question": "Can the time delay between corresponding vibration peaks at the two phones be measured?", "measured": "Not available: no matched event pair and no resolvable cross-spectrum phase slope, so no delay estimate exists.", "interpretation": "A time difference between corresponding peaks is measurable whenever matched events exist and the shared timing resolution is finer than the offset; it is the difference of the two phone clocks plus any propagation delay.", "not_established": "The measured delay cannot be attributed to vibration propagation through the structure because the two phone clocks are not synchronised: clock offset and propagation delay cannot be separated without a common clock or trigger.", "evidence": {"propagation": {"available": false, "method": "linear fit of unwrapped cross-spectrum phase inside one contiguous coherent band", "note": "no contiguous band reached the coherence threshold", "coh_min": 0.5, "measured_before_clock_correction": false, "raw_uncorrected": {"available": false, "delay_s": null, "delay_ms": null, "f_lo_hz": null, "f_hi_hz": null, "n_bins": null, "r2": null, "band_coherence_median": null, "note": "no contiguous band reached the coherence threshold"}, "clock_correction_applied": false, "delay_meaning": "delay_s is the cross-spectrum phase delay measured on the UNCORRECTED grid, so it includes any clock offset and is only a propagation time if the clocks are independently known; delay_after_clock_fit_s is the residual left by the clock model", "resolvable": false}, "per_event_delay": [], "per_event_delay_summary": null, "clock": {"offset_s": -3.371819, "slope_s_per_s": 0.0, "drift_s": 0.0, "drift_ppm": 0.0, "method": "cross-correlation peak lag (no matched events)", "n_anchors": 0, "ci_s": null, "applied": false, "note": "estimate only - the UTC hour grid is the alignment, no shift was applied to the data", "estimated": true, "correction_form": "none applied (UTC hour grid is the alignment)", "corrected_overlap_s": 39600.0}, "correlation": {"channel": "aVert", "raw": {"delay_s": -3.371819, "r": 0.0282, "significant_threshold_approx": 0.00696, "significant": true, "method": "normalised linear cross-correlation on a common 100.000 Hz grid, +/-10 s", "wraparound_used": false}, "corrected": {"delay_s": -3.371819, "r": 0.0282, "significant_threshold_approx": 0.00696, "significant": true, "n_samples": 3960004, "note": "linear (non-circular) correlation on the shift+trimmed grid; residual lag after the clock fit is the part the clock model did not explain"}}}, "method": "matched-event waveform cross-correlation and the cross-spectrum phase slope inside the coherent band, both on the common grid", "confidence": "medium-high for \"measurable\"; low for \"propagation\"", "caveats": ["The resolution is set by the common sample rate and the segment length, not assumed."], "trust": {"status": "insufficient_data", "confidence": "medium-high for \"measurable\"; low for \"propagation\"", "n_events": null, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no matched events and no coherent phase", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"resolution_s": 0.01, "coh_min": 0.5}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Not available: no matched event pair and no resolvable cross-spectrum phase slope, so no delay estimate exists.\nINTERPRETATION: A time difference between corresponding peaks is measurable whenever matched events exist and the shared timing resolution is finer than the offset; it is the difference of the two phone clocks plus any propagation delay.\nNOT ESTABLISHED: The measured delay cannot be attributed to vibration propagation through the structure because the two phone clocks are not synchronised: clock offset and propagation delay cannot be separated without a common clock or trigger.\nTRUST: insufficient_data (no matched events and no coherent phase)"}, "12": {"question": "Is that delay consistent enough to suggest vibration propagation through the structure?", "measured": "Not available: no matched events and no coherent band, so the consistency of the delay cannot be assessed.", "interpretation": "A tight delay distribution across independent events is what a single physical transmission path would produce, whereas a wide or unresolvable spread argues against reading the delay as propagation.", "not_established": "Consistency of the delay does not establish propagation through the structure: a common clock offset alone would produce a consistent delay, so propagation needs a synchronised or triggered recording.", "evidence": {"propagation": {"available": false, "method": "linear fit of unwrapped cross-spectrum phase inside one contiguous coherent band", "note": "no contiguous band reached the coherence threshold", "coh_min": 0.5, "measured_before_clock_correction": false, "raw_uncorrected": {"available": false, "delay_s": null, "delay_ms": null, "f_lo_hz": null, "f_hi_hz": null, "n_bins": null, "r2": null, "band_coherence_median": null, "note": "no contiguous band reached the coherence threshold"}, "clock_correction_applied": false, "delay_meaning": "delay_s is the cross-spectrum phase delay measured on the UNCORRECTED grid, so it includes any clock offset and is only a propagation time if the clocks are independently known; delay_after_clock_fit_s is the residual left by the clock model", "resolvable": false}, "per_event_delay_summary": null, "clock": {"offset_s": -3.371819, "slope_s_per_s": 0.0, "drift_s": 0.0, "drift_ppm": 0.0, "method": "cross-correlation peak lag (no matched events)", "n_anchors": 0, "ci_s": null, "applied": false, "note": "estimate only - the UTC hour grid is the alignment, no shift was applied to the data", "estimated": true, "correction_form": "none applied (UTC hour grid is the alignment)", "corrected_overlap_s": 39600.0}, "method_note": "no contiguous band reached the coherence threshold"}, "method": "dispersion of the per-event delay estimates plus the cross-spectrum phase-slope confidence interval", "confidence": null, "caveats": ["A single-house delay is far below one sample at the common rate; the claim is bounded by the timing resolution, not measured below it."], "trust": {"status": "insufficient_data", "confidence": "low", "n_events": null, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no matched events and no coherent band", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"resolution_s": 0.01}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Not available: no matched events and no coherent band, so the consistency of the delay cannot be assessed.\nINTERPRETATION: A tight delay distribution across independent events is what a single physical transmission path would produce, whereas a wide or unresolvable spread argues against reading the delay as propagation.\nNOT ESTABLISHED: Consistency of the delay does not establish propagation through the structure: a common clock offset alone would produce a consistent delay, so propagation needs a synchronised or triggered recording.\nTRUST: insufficient_data (no matched events and no coherent band)"}, "13": {"question": "Does the apparent delay change depending on vibration frequency?", "measured": "Not available: too few events carry both a delay estimate and a dominant frequency. Phase-slope result: {\"available\": false, \"clock_correction_applied\": false, \"coh_min\": 0.5, \"delay_meaning\": \"delay_s is the cross-spectrum phase delay measured on the UNCORRECTED grid, so it includes any clock offset and is only a propagation time if the clocks are independently known; delay_after_clock_fit_s is the residual left by the clock model\", \"measured_before_clock_correction\": false, \"method\": \"linear fit of unwrapped cross-spectrum phase inside one contiguous coherent band\", \"note\": \"no contiguous band reached the coherence threshold\", \"raw_uncorrected\": {\"available\": false, \"band_coherence_median\": null, \"delay_ms\": null, \"delay_s\": null, \"f_hi_hz\": null, \"f_lo_hz\": null, \"n_bins\": null, \"note\": \"no contiguous band reached the coherence threshold\", \"r2\": null}, \"resolvable\": false}", "interpretation": "Splitting the per-event delay by the event dominant frequency tests whether the delay is frequency dependent, which is what dispersive propagation would look like.", "not_established": "With only a handful of usable events, any trend is weakly constrained and no dispersion curve can be established; the phase slope is fitted only inside the coherent band.", "evidence": {"delay_vs_frequency": null, "propagation": {"available": false, "method": "linear fit of unwrapped cross-spectrum phase inside one contiguous coherent band", "note": "no contiguous band reached the coherence threshold", "coh_min": 0.5, "measured_before_clock_correction": false, "raw_uncorrected": {"available": false, "delay_s": null, "delay_ms": null, "f_lo_hz": null, "f_hi_hz": null, "n_bins": null, "r2": null, "band_coherence_median": null, "note": "no contiguous band reached the coherence threshold"}, "clock_correction_applied": false, "delay_meaning": "delay_s is the cross-spectrum phase delay measured on the UNCORRECTED grid, so it includes any clock offset and is only a propagation time if the clocks are independently known; delay_after_clock_fit_s is the residual left by the clock model", "resolvable": false}}, "method": "per-event delay split at the median dominant frequency, plus the cross-spectrum phase slope", "confidence": null, "caveats": ["Frequency dependence needs many more events than this dataset provides."], "trust": {"status": "insufficient_data", "confidence": "low", "n_events": null, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "too few events with both delay and dominant frequency", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Not available: too few events carry both a delay estimate and a dominant frequency. Phase-slope result: {\"available\": false, \"clock_correction_applied\": false, \"coh_min\": 0.5, \"delay_meaning\": \"delay_s is the cross-spectrum phase delay measured on the UNCORRECTED grid, so it includes any clock offset and is only a propagation time if the clocks are independently known; delay_after_clock_fit_s is the residual left by the clock model\", \"measured_before_clock_correction\": false, \"method\": \"linear fit of unwrapped cross-spectrum phase inside one contiguous coherent band\", \"note\": \"no contiguous band reached the coherence threshold\", \"raw_uncorrected\": {\"available\": false, \"band_coherence_median\": null, \"delay_ms\": null, \"delay_s\": null, \"f_hi_hz\": null, \"f_lo_hz\": null, \"n_bins\": null, \"note\": \"no contiguous band reached the coherence threshold\", \"r2\": null}, \"resolvable\": false}\nINTERPRETATION: Splitting the per-event delay by the event dominant frequency tests whether the delay is frequency dependent, which is what dispersive propagation would look like.\nNOT ESTABLISHED: With only a handful of usable events, any trend is weakly constrained and no dispersion curve can be established; the phase slope is fitted only inside the coherent band.\nTRUST: insufficient_data (too few events with both delay and dominant frequency)"}, "14": {"question": "Does one axis—X, Y, or Z—consistently respond more strongly than the others?", "measured": "upstairs: body-frame RMS ax 0.02391, ay 0.02811, az 0.03965 (shares ax 0.195, ay 0.269, az 0.536; largest az, spread 0.01575); gravity-aligned vertical_signed 0.04058 m/s^2, horizontal 0.03674 m/s^2, resultant 0.05474 m/s^2 downstairs: body-frame RMS ax 0.03293, ay 0.01696, az 0.02584 (shares ax 0.532, ay 0.141, az 0.327; largest ax, spread 0.01596); gravity-aligned vertical_signed 0.02592 m/s^2, horizontal 0.03701 m/s^2, resultant 0.04519 m/s^2 - Only the gravity-aligned vertical projection, the horizontal energy and the resultant are physically comparable between the two phones; the body-frame x/y/z axes point in different directions on the two units and are reported per phone only. Near-equal body-frame shares are what isotropic sensor noise looks like, while a real vibration source would usually make the gravity-aligned vertical stand out.", "interpretation": "Comparing the gravity-aligned vertical projection, the horizontal energy and the resultant says how the vibration is distributed; the body-frame x/y/z shares are reported per phone because those axes point in different physical directions on the two units.", "not_established": "Axis names follow the phone body, not the building, and the two units were not mounted in a known common frame, so the axis split cannot be attributed to structural directions.", "evidence": {"upstairs": {"axes": {"axes": {"ax": {"rms_ms2": 0.023906698, "std_ms2": 0.023906698, "p99_abs_ms2": 0.017752701, "share_of_energy": 0.1948}, "ay": {"rms_ms2": 0.028106796, "std_ms2": 0.028106796, "p99_abs_ms2": 0.017414232, "share_of_energy": 0.26926}, "az": {"rms_ms2": 0.039653176, "std_ms2": 0.039653176, "p99_abs_ms2": 0.019694702, "share_of_energy": 0.53593}, "vertical_signed": {"rms_ms2": 0.040582906, "std_ms2": 0.039848324}, "horizontal": {"rms_ms2": 0.036737308, "std_ms2": 0.035608333}, "resultant": {"rms_ms2": 0.054741229, "std_ms2": 0.052948417}}, "gravity_available": true, "gravity_unit_body_frame": [0.044466, -0.018885, -0.998832], "comparable_across_phones": ["vertical_signed", "horizontal", "resultant"], "not_comparable_across_phones": ["ax", "ay", "az"], "note": "body-frame x/y/z axes point in different physical directions on the two phones, so only the gravity-aligned vertical, the horizontal energy and the resultant may be compared between them; the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ", "robustness_note": "plain RMS is dominated by rare samples, not by continuous vibration: for aT the top 0.01% of samples carry 98.43% of the total energy, so the plain RMS 0.052956 m/s^2 collapses to 0.005635 m/s^2 once samples above the 99.9th percentile are removed (9.4x), while the robust sigma is 0.003336 m/s^2 and the 1 s background is the right measure of continuous motion"}, "axis_map": {"ax": {"rms_ms2": 0.023906698, "std_ms2": 0.023906698, "p99_abs_ms2": 0.017752701, "share_of_energy": 0.1948}, "ay": {"rms_ms2": 0.028106796, "std_ms2": 0.028106796, "p99_abs_ms2": 0.017414232, "share_of_energy": 0.26926}, "az": {"rms_ms2": 0.039653176, "std_ms2": 0.039653176, "p99_abs_ms2": 0.019694702, "share_of_energy": 0.53593}, "vertical_signed": {"rms_ms2": 0.040582906, "std_ms2": 0.039848324}, "horizontal": {"rms_ms2": 0.036737308, "std_ms2": 0.035608333}, "resultant": {"rms_ms2": 0.054741229, "std_ms2": 0.052948417}}, "gravity_aligned_comparable": ["vertical_signed", "horizontal", "resultant"]}, "downstairs": {"axes": {"axes": {"ax": {"rms_ms2": 0.032926342, "std_ms2": 0.032926342, "p99_abs_ms2": 0.017506562, "share_of_energy": 0.53161}, "ay": {"rms_ms2": 0.016962163, "std_ms2": 0.016962163, "p99_abs_ms2": 0.017222989, "share_of_energy": 0.14108}, "az": {"rms_ms2": 0.025835878, "std_ms2": 0.025835878, "p99_abs_ms2": 0.018382241, "share_of_energy": 0.32731}, "vertical_signed": {"rms_ms2": 0.025923697, "std_ms2": 0.025879712}, "horizontal": {"rms_ms2": 0.037009586, "std_ms2": 0.035970286}, "resultant": {"rms_ms2": 0.045185701, "std_ms2": 0.043728779}}, "gravity_available": true, "gravity_unit_body_frame": [-0.004099, -0.030095, -0.999539], "comparable_across_phones": ["vertical_signed", "horizontal", "resultant"], "not_comparable_across_phones": ["ax", "ay", "az"], "note": "body-frame x/y/z axes point in different physical directions on the two phones, so only the gravity-aligned vertical, the horizontal energy and the resultant may be compared between them; the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ", "robustness_note": "plain RMS is dominated by rare samples, not by continuous vibration: for aT the top 0.01% of samples carry 98.85% of the total energy, so the plain RMS 0.043734 m/s^2 collapses to 0.004657 m/s^2 once samples above the 99.9th percentile are removed (9.4x), while the robust sigma is 0.002748 m/s^2 and the 1 s background is the right measure of continuous motion"}, "axis_map": {"ax": {"rms_ms2": 0.032926342, "std_ms2": 0.032926342, "p99_abs_ms2": 0.017506562, "share_of_energy": 0.53161}, "ay": {"rms_ms2": 0.016962163, "std_ms2": 0.016962163, "p99_abs_ms2": 0.017222989, "share_of_energy": 0.14108}, "az": {"rms_ms2": 0.025835878, "std_ms2": 0.025835878, "p99_abs_ms2": 0.018382241, "share_of_energy": 0.32731}, "vertical_signed": {"rms_ms2": 0.025923697, "std_ms2": 0.025879712}, "horizontal": {"rms_ms2": 0.037009586, "std_ms2": 0.035970286}, "resultant": {"rms_ms2": 0.045185701, "std_ms2": 0.043728779}}, "gravity_aligned_comparable": ["vertical_signed", "horizontal", "resultant"]}}, "method": "per-axis AC RMS and its share of total AC energy with gravity removed, plus the gravity-aligned products (aVert, aHoriz, aT) that are comparable across the two phones", "confidence": "medium-high", "caveats": ["Axis naming follows the phone body, not the building; the two phones were not mounted in the same orientation, so a cross-phone body-axis comparison is not physically meaningful.", "Near-equal shares (about 0.33 each) mean no body axis stands out; that is the expected result for isotropic sensor noise.", "the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"], "trust": {"status": "tentative", "confidence": "medium-high", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "single recording per site (first recording used)", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: upstairs: body-frame RMS ax 0.02391, ay 0.02811, az 0.03965 (shares ax 0.195, ay 0.269, az 0.536; largest az, spread 0.01575); gravity-aligned vertical_signed 0.04058 m/s^2, horizontal 0.03674 m/s^2, resultant 0.05474 m/s^2 downstairs: body-frame RMS ax 0.03293, ay 0.01696, az 0.02584 (shares ax 0.532, ay 0.141, az 0.327; largest ax, spread 0.01596); gravity-aligned vertical_signed 0.02592 m/s^2, horizontal 0.03701 m/s^2, resultant 0.04519 m/s^2 - Only the gravity-aligned vertical projection, the horizontal energy and the resultant are physically comparable between the two phones; the body-frame x/y/z axes point in different directions on the two units and are reported per phone only. Near-equal body-frame shares are what isotropic sensor noise looks like, while a real vibration source would usually make the gravity-aligned vertical stand out.\nINTERPRETATION: Comparing the gravity-aligned vertical projection, the horizontal energy and the resultant says how the vibration is distributed; the body-frame x/y/z shares are reported per phone because those axes point in different physical directions on the two units.\nNOT ESTABLISHED: Axis names follow the phone body, not the building, and the two units were not mounted in a known common frame, so the axis split cannot be attributed to structural directions."}, "15": {"question": "Are upstairs/downstairs differences predominantly vertical vibration or horizontal vibration?", "measured": "Upstairs/downstairs RMS ratio by direction: {\"ax\": 0.7261, \"ay\": 1.657, \"az\": 1.5348, \"horizontal\": 0.9926, \"resultant\": 1.2115, \"vertical_signed\": 1.5655}. Comparable directions: [\"vertical_signed\", \"horizontal\", \"resultant\"].", "interpretation": "The per-direction ratios show whether the floor-to-floor difference is carried mainly by the gravity-aligned vertical projection or by the horizontal/resultant energy.", "not_established": "The vertical/horizontal attribution is only physically meaningful for the gravity-aligned products; the body-frame axes point in different directions on the two units, so a vertical-versus-horizontal split beyond those products is not established.", "evidence": {"axis_amplification": {"per_site_rms_ms2": {"upstairs": {"ax": 0.023906698, "ay": 0.028106796, "az": 0.039653176, "vertical_signed": 0.040582906, "horizontal": 0.036737308, "resultant": 0.054741229}, "downstairs": {"ax": 0.032926342, "ay": 0.016962163, "az": 0.025835878, "vertical_signed": 0.025923697, "horizontal": 0.037009586, "resultant": 0.045185701}}, "upstairs_over_downstairs": {"az": 1.5348, "horizontal": 0.9926, "resultant": 1.2115, "ax": 0.7261, "vertical_signed": 1.5655, "ay": 1.657}, "comparable_directions": ["vertical_signed", "horizontal", "resultant"], "note": "only gravity-aligned directions are physically comparable across the two phones; body-frame axes are reported per phone only", "spectral_ratio_median_gain_db": 0.5158}, "channels": {"signed_channel_used": "aVert", "detection_channel_used": "aT (unsigned) for event detection only", "gravity_available_upstairs": true, "gravity_available_downstairs": true, "gravity_cos_deg": 2.86, "note": "signed vertical projection used for spectra/coherence/delay; the two phones sit in different body orientations, so only the gravity-aligned direction is physically common. the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"}}, "method": "AC RMS ratio per axis on the common grid, plus the same ratio restricted to the loudest windows", "confidence": "medium", "caveats": ["Check the orientation comparison (Q49) before trusting the axis split.", "the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"], "trust": {"status": "tentative", "confidence": "medium", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "unknown relative orientation of the two units", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Upstairs/downstairs RMS ratio by direction: {\"ax\": 0.7261, \"ay\": 1.657, \"az\": 1.5348, \"horizontal\": 0.9926, \"resultant\": 1.2115, \"vertical_signed\": 1.5655}. Comparable directions: [\"vertical_signed\", \"horizontal\", \"resultant\"].\nINTERPRETATION: The per-direction ratios show whether the floor-to-floor difference is carried mainly by the gravity-aligned vertical projection or by the horizontal/resultant energy.\nNOT ESTABLISHED: The vertical/horizontal attribution is only physically meaningful for the gravity-aligned products; the body-frame axes point in different directions on the two units, so a vertical-versus-horizontal split beyond those products is not established."}, "16": {"question": "What is the resultant 3-axis acceleration magnitude during each event rather than looking at individual axes?", "measured": "The resultant |a| = sqrt(ax^2+ay^2+az^2) is the primary detection channel on both phones: 3 upstairs and 2 downstairs events carry peak_aT, rms_aT and duration. Upstairs median event duration 1.2 s, downstairs 1.265 s; upstairs median SNR 15.58 dB, downstairs 32.56 dB.", "interpretation": "Using the resultant magnitude removes the orientation problem for detection and for event amplitude, because it is invariant to how the phone is lying on the surface.", "not_established": "The resultant carries no direction, so it cannot establish which axis or which direction the vibration came from, nor whether an event was translational.", "evidence": {"upstairs_catalog": [{"t_iso_utc": "2026-10-02T23:16:53.310Z", "peak_ms2": 0.02496636779632753, "rms_ms2": 0.015059367609300305, "duration_s": 1.2000000476837158, "snr_db": 15.577, "dominant_hz": 18.75}, {"t_iso_utc": "2026-10-02T23:17:05.770Z", "peak_ms2": 0.044014514293025525, "rms_ms2": 0.013522379875066931, "duration_s": 0.2799999713897705, "snr_db": 10.133, "dominant_hz": 15.625}, {"t_iso_utc": "2026-10-03T11:28:26.312Z", "peak_ms2": 0.6112587417110886, "rms_ms2": 0.3047453870815819, "duration_s": 1.2899999618530273, "snr_db": 42.735, "dominant_hz": 12.5}], "downstairs_catalog": [{"t_iso_utc": "2026-10-02T23:18:16.110Z", "peak_ms2": 0.10372308602560641, "rms_ms2": 0.052702532858634625, "duration_s": 1.2599999904632568, "snr_db": 28.61, "dominant_hz": 3.125}, {"t_iso_utc": "2026-10-03T11:31:21.616Z", "peak_ms2": 0.2413482688890116, "rms_ms2": 0.125115243853013, "duration_s": 1.2699999809265137, "snr_db": 36.511, "dominant_hz": 29.6875}], "note": "aT is a derived channel stored for every recording"}, "method": "derived resultant channel used throughout detection and event metrics", "confidence": "high", "caveats": ["The resultant mixes axes, so it is not a substitute for the signed channels in spectral work."], "trust": {"status": "supported", "confidence": "high", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "event detector threshold", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "evidence.upstairs_catalog[0].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.upstairs_catalog[1].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.upstairs_catalog[2].dominant_hz", "value_hz": 12.5}, {"claim": "evidence.downstairs_catalog[0].dominant_hz", "value_hz": 3.125}, {"claim": "evidence.downstairs_catalog[1].dominant_hz", "value_hz": 29.6875}, {"claim": "evidence.upstairs_catalog[0].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.upstairs_catalog[1].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.upstairs_catalog[2].dominant_hz", "value_hz": 12.5}, {"claim": "evidence.downstairs_catalog[0].dominant_hz", "value_hz": 3.125}, {"claim": "evidence.downstairs_catalog[1].dominant_hz", "value_hz": 29.6875}], "violations": []}}, "short_answer": "MEASURED: The resultant |a| = sqrt(ax^2+ay^2+az^2) is the primary detection channel on both phones: 3 upstairs and 2 downstairs events carry peak_aT, rms_aT and duration. Upstairs median event duration 1.2 s, downstairs 1.265 s; upstairs median SNR 15.58 dB, downstairs 32.56 dB.\nINTERPRETATION: Using the resultant magnitude removes the orientation problem for detection and for event amplitude, because it is invariant to how the phone is lying on the surface.\nNOT ESTABLISHED: The resultant carries no direction, so it cannot establish which axis or which direction the vibration came from, nor whether an event was translational."}, "17": {"question": "What is the normal background vibration level at each phone?", "measured": "upstairs: envelope median 0.00436 m/s^2, quiet 1 s RMS p10 0.00487 m/s^2, active p90 0.00605, AC sigma 0.01039 m/s^2, axis shares {\"ax\": {\"p99_abs_ms2\": 0.017752701, \"rms_ms2\": 0.023906698, \"share_of_energy\": 0.1948, \"std_ms2\": 0.023906698}, \"ay\": {\"p99_abs_ms2\": 0.017414232, \"rms_ms2\": 0.028106796, \"share_of_energy\": 0.26926, \"std_ms2\": 0.028106796}, \"az\": {\"p99_abs_ms2\": 0.019694702, \"rms_ms2\": 0.039653176, \"share_of_energy\": 0.53593, \"std_ms2\": 0.039653176}, \"horizontal\": {\"rms_ms2\": 0.036737308, \"std_ms2\": 0.035608333}, \"resultant\": {\"rms_ms2\": 0.054741229, \"std_ms2\": 0.052948417}, \"vertical_signed\": {\"rms_ms2\": 0.040582906, \"std_ms2\": 0.039848324}} downstairs: envelope median 0.00364 m/s^2, quiet 1 s RMS p10 0.00408 m/s^2, active p90 0.00503, AC sigma 0.02965 m/s^2, axis shares {\"ax\": {\"p99_abs_ms2\": 0.017506562, \"rms_ms2\": 0.032926342, \"share_of_energy\": 0.53161, \"std_ms2\": 0.032926342}, \"ay\": {\"p99_abs_ms2\": 0.017222989, \"rms_ms2\": 0.016962163, \"share_of_energy\": 0.14108, \"std_ms2\": 0.016962163}, \"az\": {\"p99_abs_ms2\": 0.018382241, \"rms_ms2\": 0.025835878, \"share_of_energy\": 0.32731, \"std_ms2\": 0.025835878}, \"horizontal\": {\"rms_ms2\": 0.037009586, \"std_ms2\": 0.035970286}, \"resultant\": {\"rms_ms2\": 0.045185701, \"std_ms2\": 0.043728779}, \"vertical_signed\": {\"rms_ms2\": 0.025923697, \"std_ms2\": 0.025879712}} Watch the difference between the plain RMS and the robust background - upstairs: plain RMS is dominated by rare samples, not by continuous vibration: for aT the top 0.01% of samples carry 98.43% of the total energy, so the plain RMS 0.052956 m/s^2 collapses to 0.005635 m/s^2 once samples above the 99.9th percentile are removed (9.4x), while the robust sigma is 0.003336 m/s^2 and the 1 s background is the right measure of continuous motion | downstairs: plain RMS is dominated by rare samples, not by continuous vibration: for aT the top 0.01% of samples carry 98.85% of the total energy, so the plain RMS 0.043734 m/s^2 collapses to 0.004657 m/s^2 once samples above the 99.9th percentile are removed (9.4x), while the robust sigma is 0.002748 m/s^2 and the 1 s background is the right measure of continuous motion", "interpretation": "These are single-site measurements: each number is the quiet floor of that one phone in that one recording, which is the baseline every event at that phone is measured against. Where a plain full-record RMS is much larger than this background it is set by a few rare samples (handling, start/stop artefacts), not by continuous vibration: the trimmed RMS and the robust sigma in the evidence are the right comparison.", "not_established": "A single-site background does not establish how quiet the other floor is, nor how much of the floor is unit self-noise; the two separate physical units have their own noise floors and calibration.", "evidence": {"upstairs": {"background": {"noise_floor_rms_p50_ms2": 0.005432343, "quiet_rms_p10_ms2": 0.00487121, "active_rms_p90_ms2": 0.006047913, "quiet_sigma_ms2": 0.010389668, "ac_std_ms2": 0.033583131, "rms_1s_quantiles": {"p0": 0.003735, "p1": 0.004446, "p5": 0.004718, "p25": 0.005133, "p50": 0.005432, "p75": 0.005748, "p95": 0.006244, "p99": 0.006694, "p100": 5.214226}, "rms_60s_quantiles": {"p0": 0.004898, "p1": 0.005078, "p5": 0.005184, "p25": 0.005324, "p50": 0.005462, "p75": 0.005574, "p95": 0.005765, "p99": 0.006446, "p100": 0.163121}, "envelope_median_ms2": 0.004364014, "envelope_p999_ms2": 0.007123169, "envelope_robust_sigma_ms2": 0.000702605, "method": "single-pole 0.2 Hz high-pass, 0.25 s envelope, 1 s RMS blocks", "note": "sensor noise level: this is the scale of the quietest vibration this phone can report"}, "detection": {"available": true, "stem": "multi_1791026911.329183 2", "label": "upstairs", "source_file": "csv/multi_1791026911.329183 2.csv", "signal_used_for_detection": "aT = |a| (unsigned resultant)", "signal_used_for_spectra": "aVert (signed projection on the median gravity vector)", "tiers": {"high": {"events": [{"index": 1, "tier": "high", "t_onset": 1790983013.31, "t_peak": 1790983013.31, "t_end": 1790983014.51, "duration_s": 1.2000000476837158, "peak_env": 0.026226201148804192, "peak_aT": 0.02496636779632753, "baseline_ms2": 0.004363833, "detector_threshold_ms2": 0.007028708, "snr_db": 15.577, "rms_aT": 0.015059367609300305, "rms_vert": 0.008350151071012026, "peak_vert": 0.02706688088689154, "peak_w": 0.004860041197389364, "g_change": 0.004057943820953369, "decay_tau_s": 0.8499991925007672, "t_iso_utc": "2026-10-02T23:16:53.310Z", "handling_flag": false, "dominant_hz": 18.75, "spectral_peaks": [{"freq_hz": 18.75, "psd": 0.001883226314, "prominence": 0.001871006095, "ratio_to_median": 13.397}], "centroid_hz": 19.648, "band_power": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 0.0, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "0.5-1 Hz": {"power": 0.0, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "1-2 Hz": {"power": 0.0, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "2-4 Hz": {"power": 0.0, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "4-8 Hz": {"power": 0.000448947228, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.021188375, "fraction": 0.03532}, "8-16 Hz": {"power": 0.002443225249, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.049428992, "fraction": 0.1922}, "16-32 Hz": {"power": 0.009240332138, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.096126646, "fraction": 0.72692}, "32-64 Hz": {"power": 0.000579076863, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.024064016, "fraction": 0.04556}}, "total_power": 0.012711581479, "total_rms_ms2": 0.112745649, "fmax_hz": 45.0}, "spectrum_unavailable": null, "zeta": 0.009412, "damping": {"available": true, "method": "log-linear fit of the envelope decay after the peak", "formula": "zeta = 1 / sqrt(1 + (2*pi*f*tau)^2)", "tau_s": 0.901797, "zeta": 0.009412, "f_hz": 18.75, "r2": 0.9558, "n_points": 136, "monotone_fraction": 0.652, "quality": "medium", "baseline_ms2": 0.004363833, "peak_env_ms2": 0.026226201, "note": "decay fit is medium; a single impulse-like event is needed before this damping ratio means anything"}}, {"index": 2, "tier": "high", "t_onset": 1790983025.641, "t_peak": 1790983025.77, "t_end": 1790983025.921, "duration_s": 0.2799999713897705, "peak_env": 0.014012943289433224, "peak_aT": 0.044014514293025525, "baseline_ms2": 0.004363833, "detector_threshold_ms2": 0.007028708, "snr_db": 10.133, "rms_aT": 0.013522379875066931, "rms_vert": 0.014406365929013886, "peak_vert": 0.06090895714016631, "peak_w": 0.005537147168070078, "g_change": 0.01197504997253418, "decay_tau_s": 0.399999620000361, "t_iso_utc": "2026-10-02T23:17:05.770Z", "handling_flag": false, "dominant_hz": 15.625, "spectral_peaks": [{"freq_hz": 15.625, "psd": 3.581966e-06, "prominence": 3.462292e-06, "ratio_to_median": 5.602}, {"freq_hz": 29.6875, "psd": 3.179773e-06, "prominence": 3.056243e-06, "ratio_to_median": 4.973}, {"freq_hz": 23.4375, "psd": 2.41977e-06, "prominence": 2.249151e-06, "ratio_to_median": 3.784}], "centroid_hz": 21.324, "band_power": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 0.0, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "0.5-1 Hz": {"power": 0.0, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "1-2 Hz": {"power": 0.0, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "2-4 Hz": {"power": 0.0, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "4-8 Hz": {"power": 5.636725e-06, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002374179, "fraction": 0.15117}, "8-16 Hz": {"power": 6.25951e-06, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002501901, "fraction": 0.16787}, "16-32 Hz": {"power": 1.8872929e-05, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.004344298, "fraction": 0.50613}, "32-64 Hz": {"power": 6.519347e-06, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.002553301, "fraction": 0.17484}}, "total_power": 3.7288512e-05, "total_rms_ms2": 0.006106432, "fmax_hz": 45.0}, "spectrum_unavailable": null, "zeta": 0.012875, "damping": {"available": true, "method": "log-linear fit of the envelope decay after the peak", "formula": "zeta = 1 / sqrt(1 + (2*pi*f*tau)^2)", "tau_s": 0.79108, "zeta": 0.012875, "f_hz": 15.625, "r2": 0.5592, "n_points": 71, "monotone_fraction": 0.614, "quality": "low", "baseline_ms2": 0.004363833, "peak_env_ms2": 0.014012943, "note": "decay fit is low; a single impulse-like event is needed before this damping ratio means anything"}}, {"index": 3, "tier": "high", "t_onset": 1791026905.022, "t_peak": 1791026906.312, "t_end": 1791026906.312, "duration_s": 1.2899999618530273, "peak_env": 0.5978831341784098, "peak_aT": 0.6112587417110886, "baseline_ms2": 0.004363833, "detector_threshold_ms2": 0.007028708, "snr_db": 42.735, "rms_aT": 0.3047453870815819, "rms_vert": 0.019010181393646616, "peak_vert": 0.0674729786970445, "peak_w": 0.007176349870860577, "g_change": 0.010625660419464111, "decay_tau_s": null, "t_iso_utc": "2026-10-03T11:28:26.312Z", "handling_flag": false, "dominant_hz": 12.5, "spectral_peaks": [{"freq_hz": 12.5, "psd": 3.57146e-06, "prominence": 3.086664e-06, "ratio_to_median": 2.812}, {"freq_hz": 31.25, "psd": 3.003245e-06, "prominence": 2.447982e-06, "ratio_to_median": 2.365}, {"freq_hz": 35.9375, "psd": 2.499675e-06, "prominence": 1.200847e-06, "ratio_to_median": 1.968}], "centroid_hz": 25.094, "band_power": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 0.0, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "0.5-1 Hz": {"power": 0.0, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "1-2 Hz": {"power": 0.0, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "2-4 Hz": {"power": 0.0, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "4-8 Hz": {"power": 2.298779e-06, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.001516172, "fraction": 0.04216}, "8-16 Hz": {"power": 1.443313e-05, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.003799096, "fraction": 0.26469}, "16-32 Hz": {"power": 1.682605e-05, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.004101957, "fraction": 0.30857}, "32-64 Hz": {"power": 2.0970649e-05, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.004579372, "fraction": 0.38458}}, "total_power": 5.4528608e-05, "total_rms_ms2": 0.007384349, "fmax_hz": 45.0}, "spectrum_unavailable": null, "zeta": null, "damping": {"available": false, "method": "log-linear fit of the envelope decay after the peak", "formula": "zeta = 1 / sqrt(1 + (2*pi*f*tau)^2)", "note": "decay too short or already at the baseline", "tau_s": null}}], "event_count": 3, "meta": {"tier": "high", "envelope_s": 0.25, "min_duration_s": 0.25, "merge_gap_s": 0.5, "trim": {"start_index": 498, "end_index": 4389843, "trim_s": 5.0, "filter_applied_before_trim": true, "note": "the 0.2 Hz high-pass is applied to the whole recording before trimming, so the trim boundary cannot create an artefact"}, "threshold_rule": "percentile 99.9 of the site envelope, capped at median + 20 robust sigma", "events": 3, "threshold_percentile": 99.9, "threshold_ms2": 0.007028708, "threshold_percentile_ms2": 0.007028708, "threshold_capped_by_noise_floor": false, "noise_floor_cap_ms2": 0.018412212, "threshold_over_median": 1.611, "peak_min_multiple": 2.0, "envelope_median_ms2": 0.004363833, "envelope_robust_sigma_ms2": 0.000702419, "samples_above_threshold": 4390, "candidate_groups": 706, "groups_passing_duration": 37, "sub_threshold_candidates": 3, "sub_threshold_examples": [{"t_onset": 1790983017.501, "t_peak": 1790983017.67, "duration_s": 0.2390000820159912, "peak_env_ms2": 0.01092299, "snr_db": 7.969, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791016433.111, "t_peak": 1791016433.401, "duration_s": 0.869999885559082, "peak_env_ms2": 0.013042269, "snr_db": 9.51, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018496.649, "t_peak": 1791018496.799, "duration_s": 0.4810001850128174, "peak_env_ms2": 0.008921577, "snr_db": 6.211, "reason": "SNR below the 10 dB high-confidence floor"}], "sub_threshold_note": "excursions that cleared the amplitude threshold but were not separable from the noise floor; 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Conclusions are only trustworthy if they survive both."}, "axis_share": {}, "source_file": "csv/multi_1791026911.329183 2.csv"}, "downstairs": {"background": {"noise_floor_rms_p50_ms2": 0.004526903, "quiet_rms_p10_ms2": 0.004083349, "active_rms_p90_ms2": 0.005030887, "quiet_sigma_ms2": 0.02965233, "ac_std_ms2": 0.029170073, "rms_1s_quantiles": {"p0": 0.003107, "p1": 0.003743, "p5": 0.003964, "p25": 0.00429, "p50": 0.004527, "p75": 0.004778, "p95": 0.005199, "p99": 0.00559, "p100": 3.734345}, "rms_60s_quantiles": {"p0": 0.004342, "p1": 0.004379, "p5": 0.004416, "p25": 0.004475, "p50": 0.004532, "p75": 0.004599, "p95": 0.004758, "p99": 0.00539, "p100": 0.535113}, "envelope_median_ms2": 0.003635746, "envelope_p999_ms2": 0.005869159, "envelope_robust_sigma_ms2": 0.000570086, "method": "single-pole 0.2 Hz high-pass, 0.25 s envelope, 1 s RMS blocks", "note": "sensor noise level: this is the scale of the quietest vibration this phone can report"}, "detection": {"available": true, "stem": "multi_1791027086.65238", "label": "downstairs", "source_file": "csv/multi_1791027086.65238.csv", "signal_used_for_detection": "aT = |a| (unsigned resultant)", "signal_used_for_spectra": "aVert (signed projection on the median gravity vector)", "tiers": {"high": {"events": [{"index": 1, "tier": "high", "t_onset": 1790983096.11, "t_peak": 1790983096.11, "t_end": 1790983097.37, "duration_s": 1.2599999904632568, "peak_env": 0.09796136698553255, "peak_aT": 0.10372308602560641, "baseline_ms2": 0.003635622, "detector_threshold_ms2": 0.005813564, "snr_db": 28.61, "rms_aT": 0.052702532858634625, "rms_vert": 0.012092174485180835, "peak_vert": 0.030079090431286017, "peak_w": 0.006667833309620619, "g_change": 0.0033844709396362305, "decay_tau_s": 0.809999230500731, "t_iso_utc": "2026-10-02T23:18:16.110Z", "handling_flag": false, "dominant_hz": 3.125, "spectral_peaks": [{"freq_hz": 3.125, "psd": 0.86845533275, "prominence": 0.293917208347, "ratio_to_median": 201.603}], "centroid_hz": 5.797, "band_power": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 0.0, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "0.5-1 Hz": {"power": 0.0, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "1-2 Hz": {"power": 0.0, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "2-4 Hz": {"power": 0.0, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "4-8 Hz": {"power": 1.769167856128, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 1.330100694, "fraction": 0.74848}, "8-16 Hz": {"power": 0.527783348139, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.726486991, "fraction": 0.22329}, "16-32 Hz": {"power": 0.062562047731, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.250124065, "fraction": 0.02647}, "32-64 Hz": {"power": 0.004166750422, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.064550371, "fraction": 0.00176}}, "total_power": 2.363680002421, "total_rms_ms2": 1.537426422, "fmax_hz": 45.0}, "spectrum_unavailable": null, "zeta": 0.048281, "damping": {"available": true, "method": "log-linear fit of the envelope decay after the peak", "formula": "zeta = 1 / sqrt(1 + (2*pi*f*tau)^2)", "tau_s": 1.053629, "zeta": 0.048281, "f_hz": 3.125, "r2": 0.9528, "n_points": 355, "monotone_fraction": 0.709, "quality": "medium", "baseline_ms2": 0.003635622, "peak_env_ms2": 0.097961367, "note": "decay fit is medium; a single impulse-like event is needed before this damping ratio means anything"}}, {"index": 2, "tier": "high", "t_onset": 1791027080.346, "t_peak": 1791027081.616, "t_end": 1791027081.616, "duration_s": 1.2699999809265137, "peak_env": 0.24328613724253956, "peak_aT": 0.2413482688890116, "baseline_ms2": 0.003635622, "detector_threshold_ms2": 0.005813564, "snr_db": 36.511, "rms_aT": 0.125115243853013, "rms_vert": 0.021668177774908266, "peak_vert": 0.04768231358291647, "peak_w": 0.007368853315711021, "g_change": 0.0030549168586730957, "decay_tau_s": null, "t_iso_utc": "2026-10-03T11:31:21.616Z", "handling_flag": false, "dominant_hz": 29.6875, "spectral_peaks": [{"freq_hz": 29.6875, "psd": 2.327017e-06, "prominence": 1.783059e-06, "ratio_to_median": 2.835}, {"freq_hz": 12.5, "psd": 1.372819e-06, "prominence": 8.53292e-07, "ratio_to_median": 1.672}], "centroid_hz": 25.193, "band_power": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 0.0, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "0.5-1 Hz": {"power": 0.0, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "1-2 Hz": {"power": 0.0, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "2-4 Hz": {"power": 0.0, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "4-8 Hz": {"power": 9.80261e-07, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.000990081, "fraction": 0.03026}, "8-16 Hz": {"power": 5.907943e-06, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002430626, "fraction": 0.18235}, "16-32 Hz": {"power": 1.6210597e-05, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.004026239, "fraction": 0.50034}, "32-64 Hz": {"power": 9.30009e-06, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.003049605, "fraction": 0.28705}}, "total_power": 3.239889e-05, "total_rms_ms2": 0.005692002, "fmax_hz": 45.0}, "spectrum_unavailable": null, "zeta": null, "damping": {"available": false, "method": "log-linear fit of the envelope decay after the peak", "formula": "zeta = 1 / sqrt(1 + (2*pi*f*tau)^2)", "note": "decay too short or already at the baseline", "tau_s": null}}], "event_count": 2, "meta": {"tier": "high", "envelope_s": 0.25, "min_duration_s": 0.25, "merge_gap_s": 0.5, "trim": {"start_index": 500, "end_index": 4399154, "trim_s": 5.0, "filter_applied_before_trim": true, "note": "the 0.2 Hz high-pass is applied to the whole recording before trimming, so the trim boundary cannot create an artefact"}, "threshold_rule": "percentile 99.9 of the site envelope, capped at median + 20 robust sigma", "events": 2, "threshold_percentile": 99.9, "threshold_ms2": 0.005813564, "threshold_percentile_ms2": 0.005813564, "threshold_capped_by_noise_floor": false, "noise_floor_cap_ms2": 0.015035133, "threshold_over_median": 1.599, "peak_min_multiple": 2.0, "envelope_median_ms2": 0.003635622, "envelope_robust_sigma_ms2": 0.000569976, "samples_above_threshold": 4399, "candidate_groups": 667, "groups_passing_duration": 31, "sub_threshold_candidates": 4, "sub_threshold_examples": [{"t_onset": 1790983107.33, "t_peak": 1790983107.499, "duration_s": 0.24100017547607422, "peak_env_ms2": 0.007453218, "snr_db": 6.235, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018317.333, "t_peak": 1791018317.484, "duration_s": 0.6800000667572021, "peak_env_ms2": 0.00729361, "snr_db": 6.047, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018401.591, "t_peak": 1791018401.651, "duration_s": 0.2389998435974121, "peak_env_ms2": 0.007404088, "snr_db": 6.178, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018595.077, "t_peak": 1791018595.227, "duration_s": 0.3000001907348633, "peak_env_ms2": 0.007728569, "snr_db": 6.55, "reason": "SNR below the 10 dB high-confidence floor"}], "sub_threshold_note": "excursions that cleared the amplitude threshold but were not separable from the noise floor; they are reported so the reader can see what was rejected"}, "sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}], "env_summary": {"median_ms2": 0.003635622, "p999_ms2": 0.005813564, "robust_sigma_ms2": 0.000569976}, "enriched_count": 2}, "sensitive": {"events": [{"index": 1, "tier": "sensitive", "t_onset": 1790983096.11, "t_peak": 1790983096.11, "t_end": 1790983097.37, "duration_s": 1.2599999904632568, "peak_env": 0.09796136698553255, "peak_aT": 0.10372308602560641, "baseline_ms2": 0.004582981, "detector_threshold_ms2": 0.010476669, "snr_db": 26.598, "rms_aT": 0.052702532858634625, "rms_vert": 0.012092174485180835, "peak_vert": 0.030079090431286017, "peak_w": 0.006667833309620619, "g_change": 0.0033844709396362305, "decay_tau_s": 0.809999230500731, "t_iso_utc": "2026-10-02T23:18:16.110Z", "handling_flag": false, "dominant_hz": 3.125, "spectral_peaks": [{"freq_hz": 3.125, "psd": 0.86845533275, "prominence": 0.293917208347, "ratio_to_median": 201.603}], "centroid_hz": 5.797, "band_power": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 0.0, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "0.5-1 Hz": {"power": 0.0, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "1-2 Hz": {"power": 0.0, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "2-4 Hz": {"power": 0.0, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "4-8 Hz": {"power": 1.769167856128, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 1.330100694, "fraction": 0.74848}, "8-16 Hz": {"power": 0.527783348139, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.726486991, "fraction": 0.22329}, "16-32 Hz": {"power": 0.062562047731, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.250124065, "fraction": 0.02647}, "32-64 Hz": {"power": 0.004166750422, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.064550371, "fraction": 0.00176}}, "total_power": 2.363680002421, "total_rms_ms2": 1.537426422, "fmax_hz": 45.0}, "spectrum_unavailable": null, "zeta": 0.048281, "damping": {"available": true, "method": "log-linear fit of the envelope decay after the peak", "formula": "zeta = 1 / sqrt(1 + (2*pi*f*tau)^2)", "tau_s": 1.053629, "zeta": 0.048281, "f_hz": 3.125, "r2": 0.9528, "n_points": 355, "monotone_fraction": 0.709, "quality": "medium", "baseline_ms2": 0.003635622, "peak_env_ms2": 0.097961367, "note": "decay fit is medium; a single impulse-like event is needed before this damping ratio means anything"}}, {"index": 2, "tier": "sensitive", "t_onset": 1791027080.346, "t_peak": 1791027081.616, "t_end": 1791027081.616, "duration_s": 1.2699999809265137, "peak_env": 0.24328613724253956, "peak_aT": 0.2413482688890116, "baseline_ms2": 0.003590188, "detector_threshold_ms2": 0.007355376, "snr_db": 36.62, "rms_aT": 0.125115243853013, "rms_vert": 0.021668177774908266, "peak_vert": 0.04768231358291647, "peak_w": 0.007368853315711021, "g_change": 0.0030549168586730957, "decay_tau_s": null, "t_iso_utc": "2026-10-03T11:31:21.616Z", "handling_flag": false, "dominant_hz": 29.6875, "spectral_peaks": [{"freq_hz": 29.6875, "psd": 2.327017e-06, "prominence": 1.783059e-06, "ratio_to_median": 2.835}, {"freq_hz": 12.5, "psd": 1.372819e-06, "prominence": 8.53292e-07, "ratio_to_median": 1.672}], "centroid_hz": 25.193, "band_power": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 0.0, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "0.5-1 Hz": {"power": 0.0, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "1-2 Hz": {"power": 0.0, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "2-4 Hz": {"power": 0.0, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "4-8 Hz": {"power": 9.80261e-07, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.000990081, "fraction": 0.03026}, "8-16 Hz": {"power": 5.907943e-06, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002430626, "fraction": 0.18235}, "16-32 Hz": {"power": 1.6210597e-05, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.004026239, "fraction": 0.50034}, "32-64 Hz": {"power": 9.30009e-06, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.003049605, "fraction": 0.28705}}, "total_power": 3.239889e-05, "total_rms_ms2": 0.005692002, "fmax_hz": 45.0}, "spectrum_unavailable": null, "zeta": null, "damping": {"available": false, "method": "log-linear fit of the envelope decay after the peak", "formula": "zeta = 1 / sqrt(1 + (2*pi*f*tau)^2)", "note": "decay too short or already at the baseline", "tau_s": null}}], "event_count": 2, "meta": {"tier": "sensitive", "envelope_s": 0.25, "min_duration_s": 0.25, "merge_gap_s": 0.5, "trim": {"start_index": 500, "end_index": 4399154, "trim_s": 5.0, "filter_applied_before_trim": true, "note": "the 0.2 Hz high-pass is applied to the whole recording before trimming, so the trim boundary cannot create an artefact"}, "threshold_rule": "rolling baseline + 6 * robust sigma", "events": 2, "baseline_window_s": 600.0, "threshold_median_ms2": 0.006905942, "baseline_median_ms2": 0.003619911, "sigma_median_ms2": 0.000547435, "envelope_median_ms2": 0.003635622, "envelope_robust_sigma_ms2": 0.000569976, "samples_above_threshold": 488, "candidate_groups": 8, "groups_passing_duration": 2, "sub_threshold_candidates": 0, "sub_threshold_examples": [], "sub_threshold_note": "excursions that cleared the amplitude threshold but were not separable from the noise floor; they are reported so the reader can see what was rejected"}, "sweep": [], "env_summary": {"median_ms2": 0.003635622, "p999_ms2": null, "robust_sigma_ms2": 0.000569976}, "enriched_count": 2}}, "event_count": 2, "sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}], "sub_threshold_candidates": {"n": 4, "examples": [{"t_onset": 1790983107.33, "t_peak": 1790983107.499, "duration_s": 0.24100017547607422, "peak_env_ms2": 0.007453218, "snr_db": 6.235, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018317.333, "t_peak": 1791018317.484, "duration_s": 0.6800000667572021, "peak_env_ms2": 0.00729361, "snr_db": 6.047, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018401.591, "t_peak": 1791018401.651, "duration_s": 0.2389998435974121, "peak_env_ms2": 0.007404088, "snr_db": 6.178, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018595.077, "t_peak": 1791018595.227, "duration_s": 0.3000001907348633, "peak_env_ms2": 0.007728569, "snr_db": 6.55, "reason": "SNR below the 10 dB high-confidence floor"}], "note": "excursions that cleared the amplitude threshold but were not separable from the noise floor; they are reported so the reader can see what was rejected", "threshold_rule": "percentile 99.9 of the site envelope, capped at median + 20 robust sigma", "snr_floor_db": 10.0}, "envelope": {"median_ms2": 0.003635622, "robust_sigma_ms2": 0.000569976, "threshold_ms2": 0.005813564, "samples_above_threshold": 4399}, "threshold_conclusion_shift": [{"tier": "high", "events": 2, "threshold_rule": "percentile 99.9 of the site envelope, capped at median + 20 robust sigma"}, {"tier": "sensitive", "events": 2, "threshold_rule": "rolling baseline + 6 * robust sigma"}], "detector_limits": "the HIGH tier threshold is a percentile of this recording, so it adapts to how active the recording itself was; the SENSITIVE tier follows a rolling baseline instead.  Conclusions are only trustworthy if they survive both."}, "axis_share": {}, "source_file": "csv/multi_1791027086.65238.csv"}}, "method": "moving-average envelope of the high-passed resultant; the p10 of the 1 s RMS is the quiet floor", "confidence": "high", "caveats": ["the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"], "trust": {"status": "supported", "confidence": "high", "n_events": 5, "n_pairs": null, "time_coverage_s": 43903.002, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "single recording per site (first recording used)", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "evidence.upstairs.detection.tiers.high.events[0].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].spectral_peaks[0].freq_hz", "value_hz": 18.75}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].centroid_hz", "value_hz": 19.648}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.0.25-0.5 Hz.f_lo_hz", "value_hz": 0.25}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.0.25-0.5 Hz.f_hi_hz", "value_hz": 0.5}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.0.5-1 Hz.f_lo_hz", "value_hz": 0.5}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.0.5-1 Hz.f_hi_hz", "value_hz": 1.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.1-2 Hz.f_lo_hz", "value_hz": 1.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.1-2 Hz.f_hi_hz", "value_hz": 2.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.2-4 Hz.f_lo_hz", "value_hz": 2.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.2-4 Hz.f_hi_hz", "value_hz": 4.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.4-8 Hz.f_lo_hz", "value_hz": 4.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.4-8 Hz.f_hi_hz", "value_hz": 8.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.8-16 Hz.f_lo_hz", "value_hz": 8.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.8-16 Hz.f_hi_hz", "value_hz": 16.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.16-32 Hz.f_lo_hz", "value_hz": 16.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.16-32 Hz.f_hi_hz", "value_hz": 32.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.32-64 Hz.f_lo_hz", "value_hz": 32.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].band_power.bands.32-64 Hz.f_hi_hz", "value_hz": 45.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[0].damping.f_hz", "value_hz": 18.75}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].spectral_peaks[0].freq_hz", "value_hz": 15.625}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].spectral_peaks[1].freq_hz", "value_hz": 29.6875}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].spectral_peaks[2].freq_hz", "value_hz": 23.4375}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].centroid_hz", "value_hz": 21.324}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.0.25-0.5 Hz.f_lo_hz", "value_hz": 0.25}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.0.25-0.5 Hz.f_hi_hz", "value_hz": 0.5}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.0.5-1 Hz.f_lo_hz", "value_hz": 0.5}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.0.5-1 Hz.f_hi_hz", "value_hz": 1.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.1-2 Hz.f_lo_hz", "value_hz": 1.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.1-2 Hz.f_hi_hz", "value_hz": 2.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.2-4 Hz.f_lo_hz", "value_hz": 2.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.2-4 Hz.f_hi_hz", "value_hz": 4.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.4-8 Hz.f_lo_hz", "value_hz": 4.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.4-8 Hz.f_hi_hz", "value_hz": 8.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.8-16 Hz.f_lo_hz", "value_hz": 8.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.8-16 Hz.f_hi_hz", "value_hz": 16.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.16-32 Hz.f_lo_hz", "value_hz": 16.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.16-32 Hz.f_hi_hz", "value_hz": 32.0}, {"claim": "evidence.upstairs.detection.tiers.high.events[1].band_power.bands.32-64 Hz.f_lo_hz", "value_hz": 32.0}], "violations": []}}, "short_answer": "MEASURED: upstairs: envelope median 0.00436 m/s^2, quiet 1 s RMS p10 0.00487 m/s^2, active p90 0.00605, AC sigma 0.01039 m/s^2, axis shares {\"ax\": {\"p99_abs_ms2\": 0.017752701, \"rms_ms2\": 0.023906698, \"share_of_energy\": 0.1948, \"std_ms2\": 0.023906698}, \"ay\": {\"p99_abs_ms2\": 0.017414232, \"rms_ms2\": 0.028106796, \"share_of_energy\": 0.26926, \"std_ms2\": 0.028106796}, \"az\": {\"p99_abs_ms2\": 0.019694702, \"rms_ms2\": 0.039653176, \"share_of_energy\": 0.53593, \"std_ms2\": 0.039653176}, \"horizontal\": {\"rms_ms2\": 0.036737308, \"std_ms2\": 0.035608333}, \"resultant\": {\"rms_ms2\": 0.054741229, \"std_ms2\": 0.052948417}, \"vertical_signed\": {\"rms_ms2\": 0.040582906, \"std_ms2\": 0.039848324}} downstairs: envelope median 0.00364 m/s^2, quiet 1 s RMS p10 0.00408 m/s^2, active p90 0.00503, AC sigma 0.02965 m/s^2, axis shares {\"ax\": {\"p99_abs_ms2\": 0.017506562, \"rms_ms2\": 0.032926342, \"share_of_energy\": 0.53161, \"std_ms2\": 0.032926342}, \"ay\": {\"p99_abs_ms2\": 0.017222989, \"rms_ms2\": 0.016962163, \"share_of_energy\": 0.14108, \"std_ms2\": 0.016962163}, \"az\": {\"p99_abs_ms2\": 0.018382241, \"rms_ms2\": 0.025835878, \"share_of_energy\": 0.32731, \"std_ms2\": 0.025835878}, \"horizontal\": {\"rms_ms2\": 0.037009586, \"std_ms2\": 0.035970286}, \"resultant\": {\"rms_ms2\": 0.045185701, \"std_ms2\": 0.043728779}, \"vertical_signed\": {\"rms_ms2\": 0.025923697, \"std_ms2\": 0.025879712}} Watch the difference between the plain RMS and the robust background - upstairs: plain RMS is dominated by rare samples, not by continuous vibration: for aT the top 0.01% of samples carry 98.43% of the total energy, so the plain RMS 0.052956 m/s^2 collapses to 0.005635 m/s^2 once samples above the 99.9th percentile are removed (9.4x), while the robust sigma is 0.003336 m/s^2 and the 1 s background is the right measure of continuous motion | downstairs: plain RMS is dominated by rare samples, not by continuous vibration: for aT the top 0.01% of samples carry 98.85% of the total energy, so the plain RMS 0.043734 m/s^2 collapses to 0.004657 m/s^2 once samples above the 99.9th percentile are removed (9.4x), while the robust sigma is 0.002748 m/s^2 and the 1 s background is the right measure of continuous motion\nINTERPRETATION: These are single-site measurements: each number is the quiet floor of that one phone in that one recording, which is the baseline every event at that phone is measured against. Where a plain full-record RMS is much larger than this background it is set by a few rare samples (handling, start/stop artefacts), not by continuous vibration: the trimmed RMS and the robust sigma in the evidence are the right comparison.\nNOT ESTABLISHED: A single-site background does not establish how quiet the other floor is, nor how much of the floor is unit self-noise; the two separate physical units have their own noise floors and calibration."}, "18": {"question": "How far above background noise is each detected event?", "measured": "Each catalog entry carries snr_db: upstairs median 15.58 dB (p10 not available, p90 not available, n=3); downstairs median 32.56 dB (p10 not available, p90 not available, n=2).", "interpretation": "SNR is the event peak envelope divided by that same site's quiet floor, so it says how far each event stands above its own measurement noise.", "not_established": "SNR is relative to each site's own floor, so a higher SNR on one phone does not mean a physically stronger event there; it can reflect a lower unit noise floor.", "evidence": {"upstairs_snr_quantiles": {"p0": 10.133, "p1": 10.24188, "p5": 10.6774, "p25": 12.855, "p50": 15.577, "p75": 29.156, "p95": 40.0192, "p99": 42.19184, "p100": 42.735}, "downstairs_snr_quantiles": {"p0": 28.61, "p1": 28.68901, "p5": 29.00505, "p25": 30.58525, "p50": 32.5605, "p75": 34.53575, "p95": 36.11595, "p99": 36.43199, "p100": 36.511}, "example": [{"t_iso_utc": "2026-10-02T23:16:53.310Z", "peak_ms2": 0.02496636779632753, "rms_ms2": 0.015059367609300305, "duration_s": 1.2000000476837158, "snr_db": 15.577, "dominant_hz": 18.75}, {"t_iso_utc": "2026-10-02T23:17:05.770Z", "peak_ms2": 0.044014514293025525, "rms_ms2": 0.013522379875066931, "duration_s": 0.2799999713897705, "snr_db": 10.133, "dominant_hz": 15.625}, {"t_iso_utc": "2026-10-03T11:28:26.312Z", "peak_ms2": 0.6112587417110886, "rms_ms2": 0.3047453870815819, "duration_s": 1.2899999618530273, "snr_db": 42.735, "dominant_hz": 12.5}], "snr_definition": "20*log10(peak envelope / median quiet RMS) at the same site"}, "method": "event peak envelope divided by the median quiet RMS at the same site", "confidence": "high", "caveats": ["the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ", "The SNR floor is set by the envelope smoothing and the quiet-window definition."], "trust": {"status": "supported", "confidence": "high", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "sensor noise floor", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "evidence.example[0].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.example[1].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.example[2].dominant_hz", "value_hz": 12.5}, {"claim": "evidence.example[0].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.example[1].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.example[2].dominant_hz", "value_hz": 12.5}], "violations": []}}, "short_answer": "MEASURED: Each catalog entry carries snr_db: upstairs median 15.58 dB (p10 not available, p90 not available, n=3); downstairs median 32.56 dB (p10 not available, p90 not available, n=2).\nINTERPRETATION: SNR is the event peak envelope divided by that same site's quiet floor, so it says how far each event stands above its own measurement noise.\nNOT ESTABLISHED: SNR is relative to each site's own floor, so a higher SNR on one phone does not mean a physically stronger event there; it can reflect a lower unit noise floor."}, "19": {"question": "How does background vibration change by hour of the day?", "measured": "Median 1 s RMS per elapsed hour: {\"downstairs\": {\"h00\": {\"n_s\": 3601, \"rms_max_ms2\": 3.134699976, \"rms_median_ms2\": 0.003686886}, \"h01\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004731294, \"rms_median_ms2\": 0.003635153}, \"h02\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004648543, \"rms_median_ms2\": 0.003632841}, \"h03\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004999891, \"rms_median_ms2\": 0.003633653}, \"h04\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004751516, \"rms_median_ms2\": 0.003625931}, \"h05\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004923874, \"rms_median_ms2\": 0.003647449}, \"h06\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004682514, \"rms_median_ms2\": 0.003629714}, \"h07\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004822731, \"rms_median_ms2\": 0.00367822}, \"h08\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004723084, \"rms_median_ms2\": 0.003689368}, \"h09\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005490438, \"rms_median_ms2\": 0.003874811}, \"h10\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005175542, \"rms_median_ms2\": 0.003726731}, \"h11\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005047052, \"rms_median_ms2\": 0.003731125}, \"h12\": {\"n_s\": 792, \"rms_max_ms2\": 0.943956697, \"rms_median_ms2\": 0.003712475}}, \"upstairs\": {\"h00\": {\"n_s\": 3601, \"rms_max_ms2\": 0.740786948, \"rms_median_ms2\": 0.004263314}, \"h01\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005670455, \"rms_median_ms2\": 0.004224109}, \"h02\": {\"n_s\": 3600, \"rms_max_ms2\": 0.00553424, \"rms_median_ms2\": 0.004283033}, \"h03\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005825979, \"rms_median_ms2\": 0.004314242}, \"h04\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005864806, \"rms_median_ms2\": 0.004355518}, \"h05\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005819813, \"rms_median_ms2\": 0.004380282}, \"h06\": {\"n_s\": 3600, \"rms_max_ms2\": 0.006224608, \"rms_median_ms2\": 0.004471088}, \"h07\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005986498, \"rms_median_ms2\": 0.004489303}, \"h08\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005809051, \"rms_median_ms2\": 0.004520264}, \"h09\": {\"n_s\": 3600, \"rms_max_ms2\": 0.009037511, \"rms_median_ms2\": 0.004531644}, \"h10\": {\"n_s\": 3600, \"rms_max_ms2\": 0.006298082, \"rms_median_ms2\": 0.004551327}, \"h11\": {\"n_s\": 3600, \"rms_max_ms2\": 0.006267865, \"rms_median_ms2\": 0.004587492}, \"h12\": {\"n_s\": 701, \"rms_max_ms2\": 2.718195152, \"rms_median_ms2\": 0.005185396}}}. dB-channel hourly medians: not available.", "interpretation": "The hourly profile shows how the quiet/standing level moves during each recording, which is the background against which events stand out.", "not_established": "The two recordings do not cover the same absolute hours and the hour indices are elapsed from each recording's own start, so a shared occupancy or equipment schedule is not established.", "evidence": {"hourly_rms": {"upstairs": {"h00": {"rms_median_ms2": 0.004263314, "rms_max_ms2": 0.740786948, "n_s": 3601}, "h01": {"rms_median_ms2": 0.004224109, "rms_max_ms2": 0.005670455, "n_s": 3600}, "h02": {"rms_median_ms2": 0.004283033, "rms_max_ms2": 0.00553424, "n_s": 3600}, "h03": {"rms_median_ms2": 0.004314242, "rms_max_ms2": 0.005825979, "n_s": 3600}, "h04": {"rms_median_ms2": 0.004355518, "rms_max_ms2": 0.005864806, "n_s": 3600}, "h05": {"rms_median_ms2": 0.004380282, "rms_max_ms2": 0.005819813, "n_s": 3600}, "h06": {"rms_median_ms2": 0.004471088, "rms_max_ms2": 0.006224608, "n_s": 3600}, "h07": {"rms_median_ms2": 0.004489303, "rms_max_ms2": 0.005986498, "n_s": 3600}, "h08": {"rms_median_ms2": 0.004520264, "rms_max_ms2": 0.005809051, "n_s": 3600}, "h09": {"rms_median_ms2": 0.004531644, "rms_max_ms2": 0.009037511, "n_s": 3600}, "h10": {"rms_median_ms2": 0.004551327, "rms_max_ms2": 0.006298082, "n_s": 3600}, "h11": {"rms_median_ms2": 0.004587492, "rms_max_ms2": 0.006267865, "n_s": 3600}, "h12": {"rms_median_ms2": 0.005185396, "rms_max_ms2": 2.718195152, "n_s": 701}}, "downstairs": {"h00": {"rms_median_ms2": 0.003686886, "rms_max_ms2": 3.134699976, "n_s": 3601}, "h01": {"rms_median_ms2": 0.003635153, "rms_max_ms2": 0.004731294, "n_s": 3600}, "h02": {"rms_median_ms2": 0.003632841, "rms_max_ms2": 0.004648543, "n_s": 3600}, "h03": {"rms_median_ms2": 0.003633653, "rms_max_ms2": 0.004999891, "n_s": 3600}, "h04": {"rms_median_ms2": 0.003625931, "rms_max_ms2": 0.004751516, "n_s": 3600}, "h05": {"rms_median_ms2": 0.003647449, "rms_max_ms2": 0.004923874, "n_s": 3600}, "h06": {"rms_median_ms2": 0.003629714, "rms_max_ms2": 0.004682514, "n_s": 3600}, "h07": {"rms_median_ms2": 0.00367822, "rms_max_ms2": 0.004822731, "n_s": 3600}, "h08": {"rms_median_ms2": 0.003689368, "rms_max_ms2": 0.004723084, "n_s": 3600}, "h09": {"rms_median_ms2": 0.003874811, "rms_max_ms2": 0.005490438, "n_s": 3600}, "h10": {"rms_median_ms2": 0.003726731, "rms_max_ms2": 0.005175542, "n_s": 3600}, "h11": {"rms_median_ms2": 0.003731125, "rms_max_ms2": 0.005047052, "n_s": 3600}, "h12": {"rms_median_ms2": 0.003712475, "rms_max_ms2": 0.943956697, "n_s": 792}}}, "hourly_db": {"upstairs": {}, "downstairs": {}}, "note": "hours are counted from each recording's own start, not from a shared wall clock"}, "method": "median 1 s RMS per elapsed hour at each site (site analysis when present, otherwise computed from the recording)", "confidence": "medium", "caveats": ["Elapsed hours, not wall-clock hours; the profiles are not directly comparable between the two recordings."], "trust": {"status": "tentative", "confidence": "medium", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "elapsed-hour indexing, no shared wall clock", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Median 1 s RMS per elapsed hour: {\"downstairs\": {\"h00\": {\"n_s\": 3601, \"rms_max_ms2\": 3.134699976, \"rms_median_ms2\": 0.003686886}, \"h01\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004731294, \"rms_median_ms2\": 0.003635153}, \"h02\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004648543, \"rms_median_ms2\": 0.003632841}, \"h03\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004999891, \"rms_median_ms2\": 0.003633653}, \"h04\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004751516, \"rms_median_ms2\": 0.003625931}, \"h05\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004923874, \"rms_median_ms2\": 0.003647449}, \"h06\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004682514, \"rms_median_ms2\": 0.003629714}, \"h07\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004822731, \"rms_median_ms2\": 0.00367822}, \"h08\": {\"n_s\": 3600, \"rms_max_ms2\": 0.004723084, \"rms_median_ms2\": 0.003689368}, \"h09\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005490438, \"rms_median_ms2\": 0.003874811}, \"h10\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005175542, \"rms_median_ms2\": 0.003726731}, \"h11\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005047052, \"rms_median_ms2\": 0.003731125}, \"h12\": {\"n_s\": 792, \"rms_max_ms2\": 0.943956697, \"rms_median_ms2\": 0.003712475}}, \"upstairs\": {\"h00\": {\"n_s\": 3601, \"rms_max_ms2\": 0.740786948, \"rms_median_ms2\": 0.004263314}, \"h01\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005670455, \"rms_median_ms2\": 0.004224109}, \"h02\": {\"n_s\": 3600, \"rms_max_ms2\": 0.00553424, \"rms_median_ms2\": 0.004283033}, \"h03\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005825979, \"rms_median_ms2\": 0.004314242}, \"h04\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005864806, \"rms_median_ms2\": 0.004355518}, \"h05\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005819813, \"rms_median_ms2\": 0.004380282}, \"h06\": {\"n_s\": 3600, \"rms_max_ms2\": 0.006224608, \"rms_median_ms2\": 0.004471088}, \"h07\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005986498, \"rms_median_ms2\": 0.004489303}, \"h08\": {\"n_s\": 3600, \"rms_max_ms2\": 0.005809051, \"rms_median_ms2\": 0.004520264}, \"h09\": {\"n_s\": 3600, \"rms_max_ms2\": 0.009037511, \"rms_median_ms2\": 0.004531644}, \"h10\": {\"n_s\": 3600, \"rms_max_ms2\": 0.006298082, \"rms_median_ms2\": 0.004551327}, \"h11\": {\"n_s\": 3600, \"rms_max_ms2\": 0.006267865, \"rms_median_ms2\": 0.004587492}, \"h12\": {\"n_s\": 701, \"rms_max_ms2\": 2.718195152, \"rms_median_ms2\": 0.005185396}}}. dB-channel hourly medians: not available.\nINTERPRETATION: The hourly profile shows how the quiet/standing level moves during each recording, which is the background against which events stand out.\nNOT ESTABLISHED: The two recordings do not cover the same absolute hours and the hour indices are elapsed from each recording's own start, so a shared occupancy or equipment schedule is not established."}, "20": {"question": "Are there repeating vibration patterns at regular intervals such as every few seconds, minutes, or hours?", "measured": "Candidate repetition intervals from the envelope autocorrelation: {\"downstairs\": [], \"upstairs\": []}", "interpretation": "Peaks in the envelope autocorrelation mark lags at which the vibration level tends to repeat, which is the signature of a cyclic machine or a repeating activity.", "not_established": "An autocorrelation peak is a candidate period, not proof of a machine cycle, and it cannot establish which equipment (if any) is running on that period.", "evidence": {"periodicity": {"upstairs": {"available": true, "method": "autocorrelation of the smoothed |a| envelope, decimated to 4.0 Hz with a mean-removed FFT", "env_rate_hz": 4.0, "max_lag_s": 3600.0, "candidates": [], "interpretation": "an autocorrelation peak at lag L means the envelope repeats roughly every L seconds; peaks below ~0.2 are weak and are not evidence of a periodic machine"}, "downstairs": {"available": true, "method": "autocorrelation of the smoothed |a| envelope, decimated to 4.0 Hz with a mean-removed FFT", "env_rate_hz": 4.0, "max_lag_s": 3600.0, "candidates": [], "interpretation": "an autocorrelation peak at lag L means the envelope repeats roughly every L seconds; peaks below ~0.2 are weak and are not evidence of a periodic machine"}}, "candidates": {"upstairs": [], "downstairs": []}}, "method": "autocorrelation of the RMS envelope with the mean removed; peaks at lag L indicate repetition every L seconds", "confidence": "medium", "caveats": ["The candidate list is capped at the strongest few lags; a weak but real period can be missed."], "trust": {"status": "tentative", "confidence": "medium", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "autocorrelation of a finite envelope", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Candidate repetition intervals from the envelope autocorrelation: {\"downstairs\": [], \"upstairs\": []}\nINTERPRETATION: Peaks in the envelope autocorrelation mark lags at which the vibration level tends to repeat, which is the signature of a cyclic machine or a repeating activity.\nNOT ESTABLISHED: An autocorrelation peak is a candidate period, not proof of a machine cycle, and it cannot establish which equipment (if any) is running on that period."}, "21": {"question": "Are any periodic signatures consistent with HVAC equipment, compressors, pumps, fans, appliances, traffic, or other machinery?", "measured": "Persistent narrowband lines above the local noise floor: upstairs: {\"available\": true, \"detection_threshold_psd\": 2.191017e-06, \"fmax_safe_hz\": 45.0, \"interpretation_caveat\": \"these are band-based hypotheses for equipment classes, not identifications of specific devices; a definitive call needs a labelled on/off test\", \"lines\": [], \"noise_floor_median_psd\": 1.208563e-06, \"noise_floor_sigma_psd\": 1.22807e-07} | downstairs: {\"available\": true, \"detection_threshold_psd\": 1.651462e-06, \"fmax_safe_hz\": 45.0, \"interpretation_caveat\": \"these are band-based hypotheses for equipment classes, not identifications of specific devices; a definitive call needs a labelled on/off test\", \"lines\": [], \"noise_floor_median_psd\": 1.059216e-06, \"noise_floor_sigma_psd\": 7.4031e-08}", "interpretation": "Mapping persistent lines onto equipment frequency bands gives hypotheses about the class of machine (fan, compressor, pump, appliance, traffic) that could produce them.", "not_established": "These are band-based hypotheses for equipment classes, not identifications of specific devices, and a definitive call needs a labelled on/off test of each candidate.", "evidence": {"upstairs": {"available": true, "lines": [], "noise_floor_median_psd": 1.208563e-06, "noise_floor_sigma_psd": 1.22807e-07, "detection_threshold_psd": 2.191017e-06, "interpretation_caveat": "these are band-based hypotheses for equipment classes, not identifications of specific devices; a definitive call needs a labelled on/off test"}, "downstairs": {"available": true, "lines": [], "noise_floor_median_psd": 1.059216e-06, "noise_floor_sigma_psd": 7.4031e-08, "detection_threshold_psd": 1.651462e-06, "interpretation_caveat": "these are band-based hypotheses for equipment classes, not identifications of specific devices; a definitive call needs a labelled on/off test"}}, "method": "persistent narrowband PSD lines above the local noise floor, mapped to equipment frequency bands", "confidence": "low (hypothesis)", "caveats": ["This is a band-based hypothesis, not an identification. A labelled on/off test of each appliance is the only way to confirm."], "trust": {"status": "tentative", "confidence": "low (hypothesis)", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "sensor noise floor", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Persistent narrowband lines above the local noise floor: upstairs: {\"available\": true, \"detection_threshold_psd\": 2.191017e-06, \"fmax_safe_hz\": 45.0, \"interpretation_caveat\": \"these are band-based hypotheses for equipment classes, not identifications of specific devices; a definitive call needs a labelled on/off test\", \"lines\": [], \"noise_floor_median_psd\": 1.208563e-06, \"noise_floor_sigma_psd\": 1.22807e-07} | downstairs: {\"available\": true, \"detection_threshold_psd\": 1.651462e-06, \"fmax_safe_hz\": 45.0, \"interpretation_caveat\": \"these are band-based hypotheses for equipment classes, not identifications of specific devices; a definitive call needs a labelled on/off test\", \"lines\": [], \"noise_floor_median_psd\": 1.059216e-06, \"noise_floor_sigma_psd\": 7.4031e-08}\nINTERPRETATION: Mapping persistent lines onto equipment frequency bands gives hypotheses about the class of machine (fan, compressor, pump, appliance, traffic) that could produce them.\nNOT ESTABLISHED: These are band-based hypotheses for equipment classes, not identifications of specific devices, and a definitive call needs a labelled on/off test of each candidate."}, "22": {"question": "Can individual vibration events be clustered automatically into recurring \"event types\" based on their waveform and frequency spectrum?", "measured": "upstairs: k=not available silhouette=not available over 0 events downstairs: k=not available silhouette=not available over 0 events", "interpretation": "Unsupervised clustering of the per-event band profile groups events with similar spectral shape, which is the practical way to define recurring event types without hand labelling.", "not_established": "Cluster labels are descriptive, not physical: the analysis does not establish that a cluster corresponds to one piece of equipment, and overlapping clusters leave individual events ambiguous.", "evidence": {"upstairs": {"k_search": null, "chosen_k": null, "silhouette": null, "n_events_used": null}, "downstairs": {"k_search": null, "chosen_k": null, "silhouette": null, "n_events_used": null}}, "method": "k-means on the band profile of every detected event; k chosen by silhouette", "confidence": "medium where silhouette > 0.25, otherwise weak", "caveats": ["Cluster labels are descriptive, not physical. Overlapping distributions mean some events are genuinely ambiguous."], "trust": {"status": "insufficient_data", "confidence": "medium where silhouette > 0.25, otherwise weak", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "few events per site", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: upstairs: k=not available silhouette=not available over 0 events downstairs: k=not available silhouette=not available over 0 events\nINTERPRETATION: Unsupervised clustering of the per-event band profile groups events with similar spectral shape, which is the practical way to define recurring event types without hand labelling.\nNOT ESTABLISHED: Cluster labels are descriptive, not physical: the analysis does not establish that a cluster corresponds to one piece of equipment, and overlapping clusters leave individual events ambiguous.\nTRUST: insufficient_data (few events per site)"}, "23": {"question": "How many distinct recurring event signatures exist in the dataset?", "measured": "upstairs: not attempted (0 scored events; at least 10 are needed for a meaningful k-means split) downstairs: not attempted (0 scored events; at least 10 are needed for a meaningful k-means split)", "interpretation": "The count is the number of silhouette-selected groups in the per-event band-profile clustering, which is the dataset's best estimate of how many recurring signatures exist.", "not_established": "The number is a model choice constrained by the k search, not a physical count of sources, and it cannot establish what any signature is.", "evidence": {"upstairs": null, "downstairs": null}, "method": "silhouette-selected k per site over the searched range", "confidence": "medium", "caveats": ["The k-search table shows how flat the objective is; a flat objective means the count is not sharp.", "With only a handful of detections no clustering is attempted."], "trust": {"status": "tentative", "confidence": "medium", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "few events per site", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: upstairs: not attempted (0 scored events; at least 10 are needed for a meaningful k-means split) downstairs: not attempted (0 scored events; at least 10 are needed for a meaningful k-means split)\nINTERPRETATION: The count is the number of silhouette-selected groups in the per-event band-profile clustering, which is the dataset's best estimate of how many recurring signatures exist.\nNOT ESTABLISHED: The number is a model choice constrained by the k search, not a physical count of sources, and it cannot establish what any signature is."}, "24": {"question": "At what times do each of those event types normally occur?", "measured": "No event types were derived, so there are no type times to report. Individual detection times are in Q2/Q16.", "interpretation": "The per-cluster hour histogram shows when each recurring signature tends to occur, which is the first step towards tying a signature to a schedule.", "not_established": "Elapsed hours are not wall-clock hours, and with few events per cluster the time-of-day pattern of any type is not established.", "evidence": {"upstairs": null, "downstairs": null}, "method": "hour-of-elapsed-recording histogram per cluster", "confidence": null, "caveats": ["Elapsed hours, not wall-clock hours."], "trust": {"status": "insufficient_data", "confidence": "low", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no event types derived", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: No event types were derived, so there are no type times to report. Individual detection times are in Q2/Q16.\nINTERPRETATION: The per-cluster hour histogram shows when each recurring signature tends to occur, which is the first step towards tying a signature to a schedule.\nNOT ESTABLISHED: Elapsed hours are not wall-clock hours, and with few events per cluster the time-of-day pattern of any type is not established.\nTRUST: insufficient_data (no event types derived)"}, "25": {"question": "Which recurring event types are detected by both phones?", "measured": "None: no event pairs matched across the phones (Q1), so by construction no event type is detected by both. Upstairs produced 3 detections and downstairs 2, none of them sharing an onset within 1.5 s.", "interpretation": "Event types are compared only through events that matched across the phones, so a type seen on both floors means matched physical detections, not merely similar-looking spectra.", "not_established": "Cluster identities are derived independently at each site, so a shared type is not established unless matched events carry the same signatures, and it still would not identify the source.", "evidence": {"cluster_pairing": null, "event_matching": {"tolerance_s": 1.5, "near_tolerance_s": 5.0, "n_a": 0, "n_b": 0, "n_matched": 0, "n_unmatched_up": 0, "n_unmatched_down": 0, "matched_up_indices": [], "matched_down_indices": [], "unmatched_up_indices": [], "unmatched_down_indices": [], "closest_pair_s": null, "offset_s_median": null, "offset_s_mad": null, "offset_s_quantiles": null, "note": "a match means both sites had an independent detection inside the tolerance window; unmatched detections are reported as such, and threshold differences make weak shared events look one-sided", "upstairs_events": 0, "downstairs_events": 0, "events_window": "only detections with onset inside the analysed window are matched", "matched_pairs": 0, "unmatched_upstairs": 0, "unmatched_downstairs": 0}, "upstairs_chosen_k": null, "downstairs_chosen_k": null}, "method": "matched events attached to their cluster ids at both sites", "confidence": null, "caveats": ["Cluster ids are site-local; only matched onsets justify comparing them."], "trust": {"status": "insufficient_data", "confidence": "low", "n_events": 5, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no matched event pairs", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: None: no event pairs matched across the phones (Q1), so by construction no event type is detected by both. Upstairs produced 3 detections and downstairs 2, none of them sharing an onset within 1.5 s.\nINTERPRETATION: Event types are compared only through events that matched across the phones, so a type seen on both floors means matched physical detections, not merely similar-looking spectra.\nNOT ESTABLISHED: Cluster identities are derived independently at each site, so a shared type is not established unless matched events carry the same signatures, and it still would not identify the source.\nTRUST: insufficient_data (no matched event pairs)"}, "26": {"question": "Does the waveform of the same event change between downstairs and upstairs?", "measured": "Not answerable: zero event pairs matched across the phones (Q1), so there is no shared event whose waveform could be compared.", "interpretation": "For a matched event the peak, RMS and dominant frequency can be compared between the two floors, which is how the observed waveform changes when the same excitation is seen upstairs and downstairs.", "not_established": "A change in the observed waveform does not establish a change in the structure's response: the two units have separate calibration, sensor bandwidth and mounting, any of which changes the recorded waveform for an identical input.", "evidence": {"pairs": [], "strongest_waveform": null, "per_event_delay": []}, "method": "both sites on the common grid inside each matched window, comparing peak, RMS and dominant frequency", "confidence": null, "caveats": ["the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"], "trust": {"status": "insufficient_data", "confidence": "low", "n_events": null, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no matched event pairs", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Not answerable: zero event pairs matched across the phones (Q1), so there is no shared event whose waveform could be compared.\nINTERPRETATION: For a matched event the peak, RMS and dominant frequency can be compared between the two floors, which is how the observed waveform changes when the same excitation is seen upstairs and downstairs.\nNOT ESTABLISHED: A change in the observed waveform does not establish a change in the structure's response: the two units have separate calibration, sensor bandwidth and mounting, any of which changes the recorded waveform for an identical input.\nTRUST: insufficient_data (no matched event pairs)"}, "27": {"question": "How correlated are the two phones' acceleration signals during quiet periods?", "measured": "Median cross-phone correlation in the quiet windows: 0.0001. Window classification: \"windows sorted by combined acceleration RMS; quiet = lowest 20 %, active = highest 20 %, normal = the rest\"; quiet window count 26.", "interpretation": "Quiet windows are selected by vibration energy of the common grid (lowest band of the RMS distribution), never by correlation, so the reported correlation is an independent measurement of whether the two floors share a signal when nothing is happening.", "not_established": "A correlation near zero in quiet windows does not prove the absence of a shared source; it only shows no shared signal above the two noise floors, and the result depends on the chosen window length.", "evidence": {"quiet": {"r": 0.00013, "n_windows": 26.0, "node": {"n_windows": 26, "median_correlation": 0.00013, "mean_correlation": -0.00124, "p95_abs_correlation": 0.01282, "median_variance_explained": 0.0, "rms_range_ms2": [0.007083041, 0.007342196]}}, "windows_classification": "windows sorted by combined acceleration RMS; quiet = lowest 20 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"corrected": {"delay_s": -3.371819, "r": 0.0282, "significant_threshold_approx": 0.00696, "significant": true, "n_samples": 3960004, "note": "linear (non-circular) correlation on the shift+trimmed grid; residual lag after the clock fit is the part the clock model did not explain"}}}, "method": "Pearson correlation of the high-passed channels on the common grid in windows whose class comes from the vibration-energy distribution", "confidence": "high for the number; the window definition is a caveat", "caveats": ["The quiet class is defined by an energy threshold, so a very quiet recording could have too few quiet windows to be representative."], "trust": {"status": "tentative", "confidence": "high for the number; the window definition is a caveat", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "sensor noise floor", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"window_classification": "windows sorted by combined acceleration RMS; quiet = lowest 20 %, active = highest 20 %, normal = the rest"}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Median cross-phone correlation in the quiet windows: 0.0001. Window classification: \"windows sorted by combined acceleration RMS; quiet = lowest 20 %, active = highest 20 %, normal = the rest\"; quiet window count 26.\nINTERPRETATION: Quiet windows are selected by vibration energy of the common grid (lowest band of the RMS distribution), never by correlation, so the reported correlation is an independent measurement of whether the two floors share a signal when nothing is happening.\nNOT ESTABLISHED: A correlation near zero in quiet windows does not prove the absence of a shared source; it only shows no shared signal above the two noise floors, and the result depends on the chosen window length."}, "28": {"question": "How correlated are they during major vibration events?", "measured": "Median cross-phone correlation in the active windows: 0.0013; event window correlation: not available; active window count 26.", "interpretation": "The active class is the highest-energy band of the common-grid RMS distribution; rising correlation there, relative to the quiet windows, is the positive control for a shared signal.", "not_established": "Correlation during loud windows is bounded by clock alignment, the noise floor and the resampling, so it does not establish that the loud energy came from one shared source.", "evidence": {"active": {"r": 0.00132, "n_windows": 26.0, "node": {"n_windows": 26, "median_correlation": 0.00132, "mean_correlation": 0.00042, "p95_abs_correlation": 0.00932, "median_variance_explained": 2e-06, "rms_range_ms2": [0.008325025, 0.010610496]}}, "event_window": null, "windows_classification": "windows sorted by combined acceleration RMS; quiet = lowest 20 %, active = highest 20 %, normal = the rest", "per_event_r": []}, "method": "same windowed correlation as Q27; the active class is the highest-energy band, plus peak cross-correlation per matched event", "confidence": "medium-high", "caveats": ["The active class mixes genuine vibration with non-stationary transients."], "trust": {"status": "tentative", "confidence": "medium-high", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "sensor noise floor", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"window_classification": "windows sorted by combined acceleration RMS; quiet = lowest 20 %, active = highest 20 %, normal = the rest"}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Median cross-phone correlation in the active windows: 0.0013; event window correlation: not available; active window count 26.\nINTERPRETATION: The active class is the highest-energy band of the common-grid RMS distribution; rising correlation there, relative to the quiet windows, is the positive control for a shared signal.\nNOT ESTABLISHED: Correlation during loud windows is bounded by clock alignment, the noise floor and the resampling, so it does not establish that the loud energy came from one shared source."}, "29": {"question": "At what time offset is cross-correlation between the phones maximized?", "measured": "Raw cross-correlation peak at lag -3.37182 s with r=0.0282 (variance explained 0.080%). No clock correction was applied: the offset between the two phones could not be estimated from this data, so the raw lag stands as-is and is not a propagation time. The peak is not physically meaningful: |r| < 0.05 means the alignment explains less than 0.25% of the variance, and any lag can win on a noise floor.", "interpretation": "The lag at which the whole-record cross-correlation peaks is the best global alignment of the two signals; removing the clock offset estimated from the shared timeline shows how much of that lag was clock rather than signal.", "not_established": "The peak lag is dominated by the phone clock offset and by the non-stationary nature of the signal, so it is not a propagation time and the residual is not established as a source delay.", "evidence": {"correlation": {"channel": "aVert", "raw": {"delay_s": -3.371819, "r": 0.0282, "significant_threshold_approx": 0.00696, "significant": true, "method": "normalised linear cross-correlation on a common 100.000 Hz grid, +/-10 s", "wraparound_used": false}, "corrected": {"delay_s": -3.371819, "r": 0.0282, "significant_threshold_approx": 0.00696, "significant": true, "n_samples": 3960004, "note": "linear (non-circular) correlation on the shift+trimmed grid; residual lag after the clock fit is the part the clock model did not explain"}}, "clock": {"offset_s": -3.371819, "slope_s_per_s": 0.0, "drift_s": 0.0, "drift_ppm": 0.0, "method": "cross-correlation peak lag (no matched events)", "n_anchors": 0, "ci_s": null, "applied": false, "note": "estimate only - the UTC hour grid is the alignment, no shift was applied to the data", "estimated": true, "correction_form": "none applied (UTC hour grid is the alignment)", "corrected_overlap_s": 39600.0}, "window_correlation": null}, "method": "whole-record cross-correlation before and after applying the timeline-derived clock offset", "confidence": "high for the estimate; low for attributing it to propagation", "caveats": ["The peak lag is dominated by the phone clock offset (tens of ms) and by the non-stationary nature of the signal.", "A correlation peak on a noise floor has no physical meaning unless the coefficient is large enough to explain a useful share of the variance."], "trust": {"status": "unsupported", "confidence": "high for the estimate; low for attributing it to propagation", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "timing resolution", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Raw cross-correlation peak at lag -3.37182 s with r=0.0282 (variance explained 0.080%). No clock correction was applied: the offset between the two phones could not be estimated from this data, so the raw lag stands as-is and is not a propagation time. The peak is not physically meaningful: |r| < 0.05 means the alignment explains less than 0.25% of the variance, and any lag can win on a noise floor.\nINTERPRETATION: The lag at which the whole-record cross-correlation peaks is the best global alignment of the two signals; removing the clock offset estimated from the shared timeline shows how much of that lag was clock rather than signal.\nNOT ESTABLISHED: The peak lag is dominated by the phone clock offset and by the non-stationary nature of the signal, so it is not a propagation time and the residual is not established as a source delay.\nTRUST: unsupported (timing resolution)"}, "30": {"question": "Does that optimal time offset remain stable throughout the recording?", "measured": "Clock model: offset -3.37182 s, slope 0 s/s, drift 0 s (0 ppm), method not available, anchors 0, CI not available, applied=False. Window correlation by third: \"not available\".", "interpretation": "Estimating both an offset and a slope from the shared timeline shows whether a single constant offset is enough or whether the two clocks also drift apart during the recording.", "not_established": "Residual variation between the halves of the recording could come from clock drift or from event clustering, and without a common reference clock the drift model itself is not established.", "evidence": {"clock": {"offset_s": -3.371819, "slope_s_per_s": 0.0, "drift_s": 0.0, "drift_ppm": 0.0, "method": "cross-correlation peak lag (no matched events)", "n_anchors": 0, "ci_s": null, "applied": false, "note": "estimate only - the UTC hour grid is the alignment, no shift was applied to the data", "estimated": true, "correction_form": "none applied (UTC hour grid is the alignment)", "corrected_overlap_s": 39600.0}, "window_correlation": null, "windows": {"available": true, "window_s": 300.0, "n_windows": 132, 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"mean_correlation": 0.00133, "p95_abs_correlation": 0.01306, "median_variance_explained": 0.0, "rms_range_ms2": [0.007343353, 0.008304341]}, "active": {"n_windows": 26, "median_correlation": 0.00132, "mean_correlation": 0.00042, "p95_abs_correlation": 0.00932, "median_variance_explained": 2e-06, "rms_range_ms2": [0.008325025, 0.010610496]}, "activity_contrast_db": 2.363, "activity_contrast_note": "quiet and active window RMS differ by 2.36 dB; a contrast below about 3 dB means the recording has no meaningful activity structure and the labels are only a ranking of a nearly constant noise floor"}}, "method": "shift-and-trim clock correction with a robust offset/slope fit over the shared timeline; stability checked by the per-third correlation", "confidence": "medium", "caveats": ["The correction uses shift and trim, never a wraparound shift, so no samples from the far end of a recording reappear at the other end."], "trust": {"status": "tentative", "confidence": "medium", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "timing resolution", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"n_anchors": 0, "method": "cross-correlation peak lag (no matched events)"}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Clock model: offset -3.37182 s, slope 0 s/s, drift 0 s (0 ppm), method not available, anchors 0, CI not available, applied=False. Window correlation by third: \"not available\".\nINTERPRETATION: Estimating both an offset and a slope from the shared timeline shows whether a single constant offset is enough or whether the two clocks also drift apart during the recording.\nNOT ESTABLISHED: Residual variation between the halves of the recording could come from clock drift or from event clustering, and without a common reference clock the drift model itself is not established."}, "31": {"question": "Can spectral coherence show frequencies where both phones are responding to the same physical source?", "measured": "Over 2639 Welch segments the robust result is the central tendency: median coherence 0.0003 and 90th percentile 0.0009, with only 6.14% of bins above the single-bin 0.0011 significance threshold. Those 83 bins are a multiple-comparison artefact: with 1351 bins tested, about 67.5 exceed the threshold by chance alone, and after Benjamini-Hochberg FDR control 0 bin(s) pass (q_min 0.162). The maximum coherence 0.0033 (19.8 Hz) is then checked family-wise: the segment-permutation surrogate p for the maximum is 0.179. Combined verdict on individual bins: no bin survives FDR control.", "interpretation": "Magnitude-squared coherence is the standard test for a linear shared source between two channels. The defensible reading is the one that does not cherry-pick a bin: with 1351 bins tested, individual crossings of the per-bin threshold are expected by chance, so the headline is median coherence 0.0003 against a 0.0011 significance level - and, where that holds, individual bins may only be highlighted after FDR control or a family-wise surrogate test on the maximum.", "not_established": "Coherence at the significance level does not establish that no shared source exists: a shared source below either noise floor is invisible to this test, and high coherence with low PSD is not physically meaningful.", "evidence": {"coherence": {"curve": {"freqs_hz": [0.0, 0.0333, 0.0667, 0.1, 0.1333, 0.1667, 0.2, 0.2333, 0.2667, 0.3, 0.3333, 0.3667, 0.4, 0.4333, 0.4667, 0.5, 0.5333, 0.5667, 0.6, 0.6333, 0.6667, 0.7, 0.7333, 0.7667, 0.8, 0.8333, 0.8667, 0.9, 0.9333, 0.9667, 1.0, 1.0333, 1.0667, 1.1, 1.1333, 1.1667, 1.2, 1.2333, 1.2667, 1.3, 1.3333, 1.3667, 1.4, 1.4333, 1.4667, 1.5, 1.5333, 1.5667, 1.6, 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"fraction_above_significance": 0.0614, "band_summary": {"0.25-1 Hz": {"n_bins": 22, "median_coherence": 0.0003, "fraction_above_significance": 0.0}, "1-4 Hz": {"n_bins": 90, "median_coherence": 0.00032, "fraction_above_significance": 0.1111}, "4-12 Hz": {"n_bins": 240, "median_coherence": 0.00029, "fraction_above_significance": 0.075}, "12-32 Hz": {"n_bins": 600, "median_coherence": 0.00028, "fraction_above_significance": 0.0517}, "32-45 Hz": {"n_bins": 390, "median_coherence": 0.00025, "fraction_above_significance": 0.0615}}, "channel": "aVert", "method": "magnitude-squared coherence, 30 s Hann segments, 50% overlap, on the signed vertical channel", "multiplicity": {"available": true, "method": "Benjamini-Hochberg FDR on the per-bin null coherence distribution Beta(1, n_seg-1), p = (1 - c)**(n_seg-1)", "alpha": 0.05, "n_bins": 1351, "n_seg": 2639, "n_above_alpha_threshold": 83, "expected_false_positives": 67.5, "n_surviving_fdr": 0, "fraction_surviving_fdr": 0.0, "q_min": 0.16203, "median_p_value": 0.48549, "surviving_bins": [], "verdict": "no bin survives FDR: the bins above the single-bin threshold are consistent with multiplicity", "note": "with 1351 bins at alpha = 0.05, about 68 bins cross the threshold by chance alone; q-values account for that", "family_wise_test": {"observed_max_coh": 0.00331, "observed_max_coh_freq_hz": 19.8, "surrogate_max_p95": 0.00371, "p_value": 0.1791, "significant": false, "mode": "permute", "n_segments": 2639, "note": "the maximum-coherence test is family-wise: a single cherry-picked bin must beat the surrogate distribution of the maximum, not just the per-bin threshold"}, "combined_verdict": "no bin survives FDR control", "individual_bins_established": false, "candidate_feature": null, "summary_line": "median 0.0003, p90 0.0009, max 0.0033 over 1351 bins; no bin survives FDR"}, "headline_finding": "median 0.0003, p90 0.0009, max 0.0033 over 1351 bins; no bin survives FDR", "surrogate_test": {"available": true, "method": 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0.00029, "fraction_above_significance": 0.075}, "12-32 Hz": {"n_bins": 600, "median_coherence": 0.00028, "fraction_above_significance": 0.0517}, "32-45 Hz": {"n_bins": 390, "median_coherence": 0.00025, "fraction_above_significance": 0.0615}}}, "method": "magnitude-squared coherence from Welch segments with 50% overlap, restricted to the usable band", "confidence": "medium-high", "caveats": ["Coherence needs both signals to carry energy at that frequency."], "trust": {"status": "tentative", "confidence": "medium-high", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "sensor noise floor", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"significance_threshold": 0.00113, "n_segs": 2639.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "coherence_max", "value_hz": 19.8}], "violations": []}}, "short_answer": "MEASURED: Over 2639 Welch segments the robust result is the central tendency: median coherence 0.0003 and 90th percentile 0.0009, with only 6.14% of bins above the single-bin 0.0011 significance threshold. Those 83 bins are a multiple-comparison artefact: with 1351 bins tested, about 67.5 exceed the threshold by chance alone, and after Benjamini-Hochberg FDR control 0 bin(s) pass (q_min 0.162). The maximum coherence 0.0033 (19.8 Hz) is then checked family-wise: the segment-permutation surrogate p for the maximum is 0.179. Combined verdict on individual bins: no bin survives FDR control.\nINTERPRETATION: Magnitude-squared coherence is the standard test for a linear shared source between two channels. The defensible reading is the one that does not cherry-pick a bin: with 1351 bins tested, individual crossings of the per-bin threshold are expected by chance, so the headline is median coherence 0.0003 against a 0.0011 significance level - and, where that holds, individual bins may only be highlighted after FDR control or a family-wise surrogate test on the maximum.\nNOT ESTABLISHED: Coherence at the significance level does not establish that no shared source exists: a shared source below either noise floor is invisible to this test, and high coherence with low PSD is not physically meaningful."}, "32": {"question": "At which frequencies is coherence between upstairs and downstairs highest?", "measured": "Robust view first: median coherence 0.0003, p90 0.0009, and per-band mean coherence {\"0.25-1 Hz\": {\"fraction_above_significance\": 0.0, \"median_coherence\": 0.0003, \"n_bins\": 22}, \"1-4 Hz\": {\"fraction_above_significance\": 0.1111, \"median_coherence\": 0.00032, \"n_bins\": 90}, \"12-32 Hz\": {\"fraction_above_significance\": 0.0517, \"median_coherence\": 0.00028, \"n_bins\": 600}, \"32-45 Hz\": {\"fraction_above_significance\": 0.0615, \"median_coherence\": 0.00025, \"n_bins\": 390}, \"4-12 Hz\": {\"fraction_above_significance\": 0.075, \"median_coherence\": 0.00029, \"n_bins\": 240}}. The individually highest bins are 19.8 Hz; 1.43 Hz; 7.57 Hz; 31.5 Hz; 44.43 Hz; 8.3 Hz; 39.37 Hz; 3.77 Hz - but none of them is established: no bin survives FDR control", "interpretation": "Ranking the coherence curve shows where the two phones are most tightly related, but ranked bins are adjacent, correlated and drawn from a thousand-bin search, so the band means and the median are the defensible view. A bin may only be called a shared frequency if it survives multiple-comparison control or the family-wise surrogate test on the maximum coherence.", "not_established": "A high coherence value alone does not establish that a physical source exists there, and a bin that does not survive FDR control is not evidence at all: the band means are the robust view.", "evidence": {"top_bins": [{"freq_hz": 19.8, "coherence": 0.00331}, {"freq_hz": 1.4333, "coherence": 0.00315}, {"freq_hz": 7.5667, "coherence": 0.00284}, {"freq_hz": 31.5, "coherence": 0.00277}, {"freq_hz": 44.4334, "coherence": 0.00265}, {"freq_hz": 8.3, "coherence": 0.00237}, {"freq_hz": 39.3667, "coherence": 0.00235}, {"freq_hz": 3.7667, "coherence": 0.00228}], "band_mean_coherence": {"0.25-1 Hz": {"n_bins": 22, "median_coherence": 0.0003, "fraction_above_significance": 0.0}, "1-4 Hz": {"n_bins": 90, "median_coherence": 0.00032, "fraction_above_significance": 0.1111}, "4-12 Hz": {"n_bins": 240, "median_coherence": 0.00029, "fraction_above_significance": 0.075}, "12-32 Hz": {"n_bins": 600, "median_coherence": 0.00028, "fraction_above_significance": 0.0517}, "32-45 Hz": {"n_bins": 390, "median_coherence": 0.00025, "fraction_above_significance": 0.0615}}, "significance_threshold": 0.00113}, "method": "rank coherence by frequency bin inside the usable band", "confidence": "medium", "caveats": ["Read the band means for a robust view rather than single bins."], "trust": {"status": "tentative", "confidence": "medium", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "frequency resolution", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"significance_threshold": 0.00113, "n_segs": 2639.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "coherence_bin_1", "value_hz": 19.8}, {"claim": "coherence_bin_2", "value_hz": 1.4333}, {"claim": "coherence_bin_3", "value_hz": 7.5667}, {"claim": "coherence_bin_4", "value_hz": 31.5}, {"claim": "coherence_bin_5", "value_hz": 44.4334}, {"claim": "coherence_bin_6", "value_hz": 8.3}, {"claim": "coherence_bin_7", "value_hz": 39.3667}, {"claim": "coherence_bin_8", "value_hz": 3.7667}, {"claim": "evidence.top_bins[0].freq_hz", "value_hz": 19.8}, {"claim": "evidence.top_bins[1].freq_hz", "value_hz": 1.4333}, {"claim": "evidence.top_bins[2].freq_hz", "value_hz": 7.5667}, {"claim": "evidence.top_bins[3].freq_hz", "value_hz": 31.5}, {"claim": "evidence.top_bins[4].freq_hz", "value_hz": 44.4334}, {"claim": "evidence.top_bins[5].freq_hz", "value_hz": 8.3}, {"claim": "evidence.top_bins[6].freq_hz", "value_hz": 39.3667}, {"claim": "evidence.top_bins[7].freq_hz", "value_hz": 3.7667}, {"claim": "evidence.top_bins[0].freq_hz", "value_hz": 19.8}, {"claim": "evidence.top_bins[1].freq_hz", "value_hz": 1.4333}, {"claim": "evidence.top_bins[2].freq_hz", "value_hz": 7.5667}, {"claim": "evidence.top_bins[3].freq_hz", "value_hz": 31.5}, {"claim": "evidence.top_bins[4].freq_hz", "value_hz": 44.4334}, {"claim": "evidence.top_bins[5].freq_hz", "value_hz": 8.3}, {"claim": "evidence.top_bins[6].freq_hz", "value_hz": 39.3667}, {"claim": "evidence.top_bins[7].freq_hz", "value_hz": 3.7667}], "violations": []}}, "short_answer": "MEASURED: Robust view first: median coherence 0.0003, p90 0.0009, and per-band mean coherence {\"0.25-1 Hz\": {\"fraction_above_significance\": 0.0, \"median_coherence\": 0.0003, \"n_bins\": 22}, \"1-4 Hz\": {\"fraction_above_significance\": 0.1111, \"median_coherence\": 0.00032, \"n_bins\": 90}, \"12-32 Hz\": {\"fraction_above_significance\": 0.0517, \"median_coherence\": 0.00028, \"n_bins\": 600}, \"32-45 Hz\": {\"fraction_above_significance\": 0.0615, \"median_coherence\": 0.00025, \"n_bins\": 390}, \"4-12 Hz\": {\"fraction_above_significance\": 0.075, \"median_coherence\": 0.00029, \"n_bins\": 240}}. The individually highest bins are 19.8 Hz; 1.43 Hz; 7.57 Hz; 31.5 Hz; 44.43 Hz; 8.3 Hz; 39.37 Hz; 3.77 Hz - but none of them is established: no bin survives FDR control\nINTERPRETATION: Ranking the coherence curve shows where the two phones are most tightly related, but ranked bins are adjacent, correlated and drawn from a thousand-bin search, so the band means and the median are the defensible view. A bin may only be called a shared frequency if it survives multiple-comparison control or the family-wise surrogate test on the maximum coherence.\nNOT ESTABLISHED: A high coherence value alone does not establish that a physical source exists there, and a bin that does not survive FDR control is not evidence at all: the band means are the robust view."}, "33": {"question": "Are there frequencies with strong energy but very low cross-phone coherence, suggesting highly localized vibration?", "measured": "12 low-coherence bins above 1 Hz (coherence < 0.2) with energy at both sites. Upstairs/downstairs PSD ratio median 1.126 (5th-95th percentile 1.04 to 1.22), i.e. almost flat.", "interpretation": "A frequency with strong local energy but very low cross-phone coherence would be the signature of vibration that does not reach the other phone - a localized source.", "not_established": "Low coherence can also mean the signal is below the coherent detection floor, so a single low-coherence bin does not establish that the vibration is localized.", "evidence": {"localized_bins": [{"freq_hz": 1.0, "coherence": 3e-05}, {"freq_hz": 1.0333, "coherence": 0.00014}, {"freq_hz": 1.0667, "coherence": 0.00069}, {"freq_hz": 1.1, "coherence": 0.00092}, {"freq_hz": 1.1333, "coherence": 0.00045}, {"freq_hz": 1.1667, "coherence": 0.00083}, {"freq_hz": 1.2, "coherence": 3e-05}, {"freq_hz": 1.2333, "coherence": 0.00036}, {"freq_hz": 1.2667, "coherence": 0.00056}, {"freq_hz": 1.3, "coherence": 0.0003}, {"freq_hz": 1.3333, "coherence": 8e-05}, {"freq_hz": 1.3667, "coherence": 0.00085}], 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"method": "Welch PSD of the signed vertical channel over the shared window, 30 s segments; ratio computed bin by bin and gated on both sites being above their own median PSD", "upstairs_psd_median": 8.2331136e-07, "downstairs_psd_median": 7.2517593e-07}, "coherence_bins": 12}, "method": "combine each site PSD with the cross coherence on the same frequency grid", "confidence": "medium", "caveats": ["Pair this with the SNR check (Q18): low coherence at low energy is not evidence of localization."], "trust": {"status": "tentative", "confidence": "medium", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "sensor noise floor", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"significance_threshold": 0.00113, "n_segs": 2639.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "localized_bin_1", "value_hz": 1.0}, {"claim": "localized_bin_2", "value_hz": 1.0333}, {"claim": "localized_bin_3", "value_hz": 1.0667}, {"claim": "localized_bin_4", "value_hz": 1.1}, {"claim": "localized_bin_5", "value_hz": 1.1333}, {"claim": "localized_bin_6", "value_hz": 1.1667}, {"claim": "localized_bin_7", "value_hz": 1.2}, {"claim": "localized_bin_8", "value_hz": 1.2333}, {"claim": "localized_bin_9", "value_hz": 1.2667}, {"claim": "localized_bin_10", "value_hz": 1.3}, {"claim": "localized_bin_11", "value_hz": 1.3333}, {"claim": "localized_bin_12", "value_hz": 1.3667}, {"claim": "evidence.localized_bins[0].freq_hz", "value_hz": 1.0}, {"claim": "evidence.localized_bins[1].freq_hz", "value_hz": 1.0333}, {"claim": "evidence.localized_bins[2].freq_hz", "value_hz": 1.0667}, {"claim": "evidence.localized_bins[3].freq_hz", "value_hz": 1.1}, {"claim": "evidence.localized_bins[4].freq_hz", "value_hz": 1.1333}, {"claim": "evidence.localized_bins[5].freq_hz", "value_hz": 1.1667}, {"claim": "evidence.localized_bins[6].freq_hz", "value_hz": 1.2}, {"claim": "evidence.localized_bins[7].freq_hz", "value_hz": 1.2333}, {"claim": "evidence.localized_bins[8].freq_hz", "value_hz": 1.2667}, {"claim": "evidence.localized_bins[9].freq_hz", "value_hz": 1.3}, {"claim": "evidence.localized_bins[10].freq_hz", "value_hz": 1.3333}, {"claim": "evidence.localized_bins[11].freq_hz", "value_hz": 1.3667}, {"claim": "evidence.localized_bins[0].freq_hz", "value_hz": 1.0}, {"claim": "evidence.localized_bins[1].freq_hz", "value_hz": 1.0333}, {"claim": "evidence.localized_bins[2].freq_hz", "value_hz": 1.0667}, {"claim": "evidence.localized_bins[3].freq_hz", "value_hz": 1.1}, {"claim": "evidence.localized_bins[4].freq_hz", "value_hz": 1.1333}, {"claim": "evidence.localized_bins[5].freq_hz", "value_hz": 1.1667}, {"claim": "evidence.localized_bins[6].freq_hz", "value_hz": 1.2}, {"claim": "evidence.localized_bins[7].freq_hz", "value_hz": 1.2333}, {"claim": "evidence.localized_bins[8].freq_hz", "value_hz": 1.2667}, {"claim": "evidence.localized_bins[9].freq_hz", "value_hz": 1.3}, {"claim": "evidence.localized_bins[10].freq_hz", "value_hz": 1.3333}, {"claim": "evidence.localized_bins[11].freq_hz", "value_hz": 1.3667}], "violations": []}}, "short_answer": "MEASURED: 12 low-coherence bins above 1 Hz (coherence < 0.2) with energy at both sites. Upstairs/downstairs PSD ratio median 1.126 (5th-95th percentile 1.04 to 1.22), i.e. almost flat.\nINTERPRETATION: A frequency with strong local energy but very low cross-phone coherence would be the signature of vibration that does not reach the other phone - a localized source.\nNOT ESTABLISHED: Low coherence can also mean the signal is below the coherent detection floor, so a single low-coherence bin does not establish that the vibration is localized."}, "34": {"question": "Can wavelet analysis reveal short-lived vibration bursts that a normal FFT would hide?", "measured": "3 upstairs and 2 downstairs events were found from the time-domain envelope, with a median duration of 1.26 s; the shortest events are 0.28 s. Duration quantiles: upstairs {\"p0\": 0.28, \"p1\": 0.2984, \"p100\": 1.29, \"p25\": 0.74, \"p5\": 0.372, \"p50\": 1.2, \"p75\": 1.245, \"p95\": 1.281, \"p99\": 1.2882}, downstairs {\"p0\": 1.26, \"p1\": 1.2601, \"p100\": 1.27, \"p25\": 1.2625, \"p5\": 1.2605, \"p50\": 1.265, \"p75\": 1.2675, \"p95\": 1.2695, \"p99\": 1.2699}.", "interpretation": "Short-lived bursts are recovered from the time-domain envelope and given their own spectrum per event, so a whole-recording FFT is not the only available view of transients.", "not_established": "This pipeline does not run a continuous wavelet transform, so frequency drift inside a longer event and structure below the envelope smoothing scale are not established.", "evidence": {"duration_quantiles_upstairs": {"p0": 0.28, "p1": 0.2984, "p5": 0.372, "p25": 0.74, "p50": 1.2, "p75": 1.245, "p95": 1.281, "p99": 1.2882, "p100": 1.29}, "duration_quantiles_downstairs": {"p0": 1.26, "p1": 1.2601, "p5": 1.2605, "p25": 1.2625, "p50": 1.265, "p75": 1.2675, "p95": 1.2695, "p99": 1.2699, "p100": 1.27}, "shortest_events": [{"t_iso_utc": "2026-10-02T23:17:05.770Z", "peak_ms2": 0.044014514293025525, "rms_ms2": 0.013522379875066931, "duration_s": 0.2799999713897705, "snr_db": 10.133, "dominant_hz": 15.625}, {"t_iso_utc": "2026-10-02T23:16:53.310Z", "peak_ms2": 0.02496636779632753, "rms_ms2": 0.015059367609300305, "duration_s": 1.2000000476837158, "snr_db": 15.577, "dominant_hz": 18.75}, {"t_iso_utc": "2026-10-02T23:18:16.110Z", "peak_ms2": 0.10372308602560641, "rms_ms2": 0.052702532858634625, "duration_s": 1.2599999904632568, "snr_db": 28.61, "dominant_hz": 3.125}, {"t_iso_utc": "2026-10-03T11:31:21.616Z", "peak_ms2": 0.2413482688890116, "rms_ms2": 0.125115243853013, "duration_s": 1.2699999809265137, "snr_db": 36.511, "dominant_hz": 29.6875}, {"t_iso_utc": "2026-10-03T11:28:26.312Z", "peak_ms2": 0.6112587417110886, "rms_ms2": 0.3047453870815819, "duration_s": 1.2899999618530273, "snr_db": 42.735, "dominant_hz": 12.5}]}, "method": "time-domain envelope detection rather than a CWT; per-event FFT for the spectral content of each burst", "confidence": "medium-high", "caveats": ["A CWT would localize the frequency drift inside longer events, which this pipeline does not attempt."], "trust": {"status": "tentative", "confidence": "medium-high", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "envelope smoothing window", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "evidence.shortest_events[0].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.shortest_events[1].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.shortest_events[2].dominant_hz", "value_hz": 3.125}, {"claim": "evidence.shortest_events[3].dominant_hz", "value_hz": 29.6875}, {"claim": "evidence.shortest_events[4].dominant_hz", "value_hz": 12.5}, {"claim": "evidence.shortest_events[0].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.shortest_events[1].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.shortest_events[2].dominant_hz", "value_hz": 3.125}, {"claim": "evidence.shortest_events[3].dominant_hz", "value_hz": 29.6875}, {"claim": "evidence.shortest_events[4].dominant_hz", "value_hz": 12.5}], "violations": []}}, "short_answer": "MEASURED: 3 upstairs and 2 downstairs events were found from the time-domain envelope, with a median duration of 1.26 s; the shortest events are 0.28 s. Duration quantiles: upstairs {\"p0\": 0.28, \"p1\": 0.2984, \"p100\": 1.29, \"p25\": 0.74, \"p5\": 0.372, \"p50\": 1.2, \"p75\": 1.245, \"p95\": 1.281, \"p99\": 1.2882}, downstairs {\"p0\": 1.26, \"p1\": 1.2601, \"p100\": 1.27, \"p25\": 1.2625, \"p5\": 1.2605, \"p50\": 1.265, \"p75\": 1.2675, \"p95\": 1.2695, \"p99\": 1.2699}.\nINTERPRETATION: Short-lived bursts are recovered from the time-domain envelope and given their own spectrum per event, so a whole-recording FFT is not the only available view of transients.\nNOT ESTABLISHED: This pipeline does not run a continuous wavelet transform, so frequency drift inside a longer event and structure below the envelope smoothing scale are not established."}, "35": {"question": "How long does each vibration event last?", "measured": "Median duration upstairs 1.2 s, downstairs 1.265 s. Upstairs quantiles {\"p0\": 0.28, \"p1\": 0.2984, \"p100\": 1.29, \"p25\": 0.74, \"p5\": 0.372, \"p50\": 1.2, \"p75\": 1.245, \"p95\": 1.281, \"p99\": 1.2882}; downstairs quantiles {\"p0\": 1.26, \"p1\": 1.2601, \"p100\": 1.27, \"p25\": 1.2625, \"p5\": 1.2605, \"p50\": 1.265, \"p75\": 1.2675, \"p95\": 1.2695, \"p99\": 1.2699}.", "interpretation": "Duration is the time between the envelope crossing at 20% of the event peak either side of the peak, so it measures how long each event stands above its own detector scale.", "not_established": "Duration depends on the detector threshold and the envelope smoothing, so an absolute physical duration of an event, and any difference between floors that is smaller than that dependence, is not established.", "evidence": {"upstairs_quantiles": {"p0": 0.28, "p1": 0.2984, "p5": 0.372, "p25": 0.74, "p50": 1.2, "p75": 1.245, "p95": 1.281, "p99": 1.2882, "p100": 1.29}, "downstairs_quantiles": {"p0": 1.26, "p1": 1.2601, "p5": 1.2605, "p25": 1.2625, "p50": 1.265, "p75": 1.2675, "p95": 1.2695, "p99": 1.2699, "p100": 1.27}, "definition": "time between the 20% of peak envelope crossings either side of the event peak", "per_event": [{"t_iso_utc": "2026-10-02T23:16:53.310Z", "peak_ms2": 0.02496636779632753, "rms_ms2": 0.015059367609300305, "duration_s": 1.2000000476837158, "snr_db": 15.577, "dominant_hz": 18.75}, {"t_iso_utc": "2026-10-02T23:17:05.770Z", "peak_ms2": 0.044014514293025525, "rms_ms2": 0.013522379875066931, "duration_s": 0.2799999713897705, "snr_db": 10.133, "dominant_hz": 15.625}, {"t_iso_utc": "2026-10-03T11:28:26.312Z", "peak_ms2": 0.6112587417110886, "rms_ms2": 0.3047453870815819, "duration_s": 1.2899999618530273, "snr_db": 42.735, "dominant_hz": 12.5}]}, "method": "envelope crossing at 20% of the event peak", "confidence": "high", "caveats": ["Duration depends on the threshold definition."], "trust": {"status": "supported", "confidence": "high", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "event detector threshold", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "evidence.per_event[0].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.per_event[1].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.per_event[2].dominant_hz", "value_hz": 12.5}, {"claim": "evidence.per_event[0].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.per_event[1].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.per_event[2].dominant_hz", "value_hz": 12.5}], "violations": []}}, "short_answer": "MEASURED: Median duration upstairs 1.2 s, downstairs 1.265 s. Upstairs quantiles {\"p0\": 0.28, \"p1\": 0.2984, \"p100\": 1.29, \"p25\": 0.74, \"p5\": 0.372, \"p50\": 1.2, \"p75\": 1.245, \"p95\": 1.281, \"p99\": 1.2882}; downstairs quantiles {\"p0\": 1.26, \"p1\": 1.2601, \"p100\": 1.27, \"p25\": 1.2625, \"p5\": 1.2605, \"p50\": 1.265, \"p75\": 1.2675, \"p95\": 1.2695, \"p99\": 1.2699}.\nINTERPRETATION: Duration is the time between the envelope crossing at 20% of the event peak either side of the peak, so it measures how long each event stands above its own detector scale.\nNOT ESTABLISHED: Duration depends on the detector threshold and the envelope smoothing, so an absolute physical duration of an event, and any difference between floors that is smaller than that dependence, is not established."}, "36": {"question": "How rapidly does vibration decay after a strong impulse at each location?", "measured": "Decay time constant tau (envelope falling to 1/e): upstairs 0.625 s, downstairs 0.81 s. Upstairs quantiles {\"p0\": 0.4, \"p1\": 0.4045, \"p100\": 0.849999, \"p25\": 0.5125, \"p5\": 0.4225, \"p50\": 0.624999, \"p75\": 0.737499, \"p95\": 0.827499, \"p99\": 0.845499}; downstairs quantiles {\"p0\": 0.809999, \"p1\": 0.809999, \"p100\": 0.809999, \"p25\": 0.809999, \"p5\": 0.809999, \"p50\": 0.809999, \"p75\": 0.809999, \"p95\": 0.809999, \"p99\": 0.809999}.", "interpretation": "tau measures how quickly the envelope of each site falls after an impulse, which is the raw quantity behind ringing and damping comparisons.", "not_established": "The envelope smoothing sets a resolution floor, so decay constants shorter than that floor cannot be resolved, and the measured tau mixes the surface, the phone mounting and the unit, so a structural decay rate is not established.", "evidence": {"upstairs_tau": {"p0": 0.4, "p1": 0.4045, "p5": 0.4225, "p25": 0.5125, "p50": 0.624999, "p75": 0.737499, "p95": 0.827499, "p99": 0.845499, "p100": 0.849999}, "downstairs_tau": {"p0": 0.809999, "p1": 0.809999, "p5": 0.809999, "p25": 0.809999, "p50": 0.809999, "p75": 0.809999, "p95": 0.809999, "p99": 0.809999, "p100": 0.809999}, "per_event": [{"t_iso_utc": "2026-10-02T23:16:53.310Z", "peak_ms2": 0.02496636779632753, "rms_ms2": 0.015059367609300305, "duration_s": 1.2000000476837158, "snr_db": 15.577, "dominant_hz": 18.75}, {"t_iso_utc": "2026-10-02T23:17:05.770Z", "peak_ms2": 0.044014514293025525, "rms_ms2": 0.013522379875066931, "duration_s": 0.2799999713897705, "snr_db": 10.133, "dominant_hz": 15.625}, {"t_iso_utc": "2026-10-03T11:28:26.312Z", "peak_ms2": 0.6112587417110886, "rms_ms2": 0.3047453870815819, "duration_s": 1.2899999618530273, "snr_db": 42.735, "dominant_hz": 12.5}]}, "method": "exponential fit to the smoothed envelope after the event peak", "confidence": "medium", "caveats": ["The envelope smoothing sets the resolution floor; decay constants below it cannot be resolved."], "trust": {"status": "tentative", "confidence": "medium", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "envelope smoothing window / decay fit quality", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [{"claim": "evidence.per_event[0].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.per_event[1].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.per_event[2].dominant_hz", "value_hz": 12.5}, {"claim": "evidence.per_event[0].dominant_hz", "value_hz": 18.75}, {"claim": "evidence.per_event[1].dominant_hz", "value_hz": 15.625}, {"claim": "evidence.per_event[2].dominant_hz", "value_hz": 12.5}], "violations": []}}, "short_answer": "MEASURED: Decay time constant tau (envelope falling to 1/e): upstairs 0.625 s, downstairs 0.81 s. Upstairs quantiles {\"p0\": 0.4, \"p1\": 0.4045, \"p100\": 0.849999, \"p25\": 0.5125, \"p5\": 0.4225, \"p50\": 0.624999, \"p75\": 0.737499, \"p95\": 0.827499, \"p99\": 0.845499}; downstairs quantiles {\"p0\": 0.809999, \"p1\": 0.809999, \"p100\": 0.809999, \"p25\": 0.809999, \"p5\": 0.809999, \"p50\": 0.809999, \"p75\": 0.809999, \"p95\": 0.809999, \"p99\": 0.809999}.\nINTERPRETATION: tau measures how quickly the envelope of each site falls after an impulse, which is the raw quantity behind ringing and damping comparisons.\nNOT ESTABLISHED: The envelope smoothing sets a resolution floor, so decay constants shorter than that floor cannot be resolved, and the measured tau mixes the surface, the phone mounting and the unit, so a structural decay rate is not established."}, "37": {"question": "Does the upstairs signal \"ring\" longer after an impulse than the downstairs signal?", "measured": "Upstairs median tau 0.625 s vs downstairs 0.81 s - downstairs rings longer", "interpretation": "Comparing the per-event decay constants says which floor keeps ringing after an impulse; a longer tau upstairs would be consistent with a floor-level mode with less damping.", "not_established": "The comparison is not paired and the two floors have different numbers of usable events, so a site difference in ringing is not established from this sample, and ring time still mixes the surface and the phone coupling.", "evidence": {"upstairs_tau": {"p0": 0.4, "p1": 0.4045, "p5": 0.4225, "p25": 0.5125, "p50": 0.624999, "p75": 0.737499, "p95": 0.827499, "p99": 0.845499, "p100": 0.849999}, "downstairs_tau": {"p0": 0.809999, "p1": 0.809999, "p5": 0.809999, "p25": 0.809999, "p50": 0.809999, "p75": 0.809999, "p95": 0.809999, "p99": 0.809999, "p100": 0.809999}, "paired_comparison": []}, "method": "compare the per-event decay constants; the paired comparison uses only matched events", "confidence": "medium", "caveats": ["Downstairs may have far fewer usable events, so its tau distribution is weakly constrained."], "trust": {"status": "unsupported", "confidence": "medium", "n_events": 5, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "unequal usable event counts between the floors", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Upstairs median tau 0.625 s vs downstairs 0.81 s - downstairs rings longer\nINTERPRETATION: Comparing the per-event decay constants says which floor keeps ringing after an impulse; a longer tau upstairs would be consistent with a floor-level mode with less damping.\nNOT ESTABLISHED: The comparison is not paired and the two floors have different numbers of usable events, so a site difference in ringing is not established from this sample, and ring time still mixes the surface and the phone coupling.\nTRUST: unsupported (unequal usable event counts between the floors)"}, "38": {"question": "Can the decay curve be used to estimate damping characteristics at the two locations?", "measured": "Damping ratio zeta from tau and the event dominant period (zeta = 1/sqrt(1+(2*pi*f*tau)^2)): {\"downstairs\": {\"Q_median\": 1.338, \"n\": 1, \"zeta_median\": 0.3737, \"zeta_p25\": 0.3737, \"zeta_p75\": 0.3737}, \"upstairs\": {\"Q_median\": 0.623, \"n\": 2, \"zeta_median\": 0.8178, \"zeta_p25\": 0.7615, \"zeta_p75\": 0.874}}", "interpretation": "The decay curve gives tau directly, and combining tau with the dominant frequency gives a damping ratio and a Q for the mode that is ringing.", "not_established": "The estimate assumes a single lightly damped mode and a pure impulse; events are not pure impulses, the surface is not a single-degree-of-freedom system and the phone case adds damping, so the structural damping of either floor is not established.", "evidence": {"damping": {"upstairs": {"n": 2, "zeta_median": 0.8178, "zeta_p25": 0.7615, "zeta_p75": 0.874, "Q_median": 0.623}, "downstairs": {"n": 1, "zeta_median": 0.3737, "zeta_p25": 0.3737, "zeta_p75": 0.3737, "Q_median": 1.338}}, "method_note": "zeta from tau and the dominant period of the same event, assuming a single lightly damped mode"}, "method": "envelope decay constant plus dominant frequency, with the rounding rule zeta = 1/sqrt(1+(2*pi*f*tau)^2)", "confidence": "low", "caveats": ["Treat as an order of magnitude only."], "trust": {"status": "tentative", "confidence": "low", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "single-mode assumption", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Damping ratio zeta from tau and the event dominant period (zeta = 1/sqrt(1+(2*pi*f*tau)^2)): {\"downstairs\": {\"Q_median\": 1.338, \"n\": 1, \"zeta_median\": 0.3737, \"zeta_p25\": 0.3737, \"zeta_p75\": 0.3737}, \"upstairs\": {\"Q_median\": 0.623, \"n\": 2, \"zeta_median\": 0.8178, \"zeta_p25\": 0.7615, \"zeta_p75\": 0.874}}\nINTERPRETATION: The decay curve gives tau directly, and combining tau with the dominant frequency gives a damping ratio and a Q for the mode that is ringing.\nNOT ESTABLISHED: The estimate assumes a single lightly damped mode and a pure impulse; events are not pure impulses, the surface is not a single-degree-of-freedom system and the phone case adds damping, so the structural damping of either floor is not established."}, "39": {"question": "Do strong acceleration events coincide with changes in the gyroscope readings?", "measured": "upstairs: |w| max 11.3827 rad/s (median 0.003197), handling 5.34 s over 9 periods; 0 detected events carry gyro activity above 0.5 rad/s; per-event peak |w|/|a| median 0.126 over 3 events (0% rotation-dominated) downstairs: |w| max 12.4072 rad/s (median 0.004718), handling 3.05 s over 15 periods; 0 detected events carry gyro activity above 0.5 rad/s; per-event peak |w|/|a| median 0.047 over 2 events (0% rotation-dominated)", "interpretation": "The per-event ratio of peak |w| to peak |a|, and the count of detected events whose peak rotation rate exceeds the handling threshold, show how often an acceleration event also involved rotation of the phone.", "not_established": "Gyro and accelerometer are physically coupled on a rocking phone, so a rotation-dominated event does not establish that the vibration source was rotational rather than translation with the phone rocking on its surface.", "evidence": {"upstairs": {"gyro": {"available": true, "max_rad_s": 11.3827, "median_rad_s": 0.003197, "p99_rad_s": 0.0051, "handling_seconds": 5.34, "handling_periods": 9, "note": "gyroscope activity above 0.5 rad/s is phone handling, not structural rotation"}, "per_event_ratio": {"n": 3, "median": 0.12580275522766557, "p25": 0.06877151850602839, "p75": 0.16023314082899018, "fraction_rotation_dominated": 0.0, "definition": "peak |w| / peak |a| per detected event"}, "events_with_gyro_activity": 0, "event_sensor_flags": [{"t_iso_utc": "2026-10-02T23:16:53.310Z", "peak_w_rad_s": 0.004860041197389364, "snr_db": 15.577, "handling_flag": false}, {"t_iso_utc": "2026-10-02T23:17:05.770Z", "peak_w_rad_s": 0.005537147168070078, "snr_db": 10.133, "handling_flag": false}, {"t_iso_utc": "2026-10-03T11:28:26.312Z", "peak_w_rad_s": 0.007176349870860577, "snr_db": 42.735, "handling_flag": false}]}, "downstairs": {"gyro": {"available": true, "max_rad_s": 12.4072, "median_rad_s": 0.004718, "p99_rad_s": 0.0067, "handling_seconds": 3.05, "handling_periods": 15, "note": "gyroscope activity above 0.5 rad/s is phone handling, not structural rotation"}, "per_event_ratio": {"n": 2, "median": 0.04740849108052744, "p25": 0.03897026205165566, "p75": 0.055846720109399235, "fraction_rotation_dominated": 0.0, "definition": "peak |w| / peak |a| per detected event"}, "events_with_gyro_activity": 0, "event_sensor_flags": [{"t_iso_utc": "2026-10-02T23:18:16.110Z", "peak_w_rad_s": 0.006667833309620619, "snr_db": 28.61, "handling_flag": false}, {"t_iso_utc": "2026-10-03T11:31:21.616Z", "peak_w_rad_s": 0.007368853315711021, "snr_db": 36.511, "handling_flag": false}]}}, "method": "gyro activity statistics from the sensor checks plus the per-event peak |w| / peak |a| computed from the event catalog", "confidence": "medium-high", "caveats": ["A phone free on a surface does rock slightly."], "trust": {"status": "tentative", "confidence": "medium-high", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "gyro/accelerometer coupling", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: upstairs: |w| max 11.3827 rad/s (median 0.003197), handling 5.34 s over 9 periods; 0 detected events carry gyro activity above 0.5 rad/s; per-event peak |w|/|a| median 0.126 over 3 events (0% rotation-dominated) downstairs: |w| max 12.4072 rad/s (median 0.004718), handling 3.05 s over 15 periods; 0 detected events carry gyro activity above 0.5 rad/s; per-event peak |w|/|a| median 0.047 over 2 events (0% rotation-dominated)\nINTERPRETATION: The per-event ratio of peak |w| to peak |a|, and the count of detected events whose peak rotation rate exceeds the handling threshold, show how often an acceleration event also involved rotation of the phone.\nNOT ESTABLISHED: Gyro and accelerometer are physically coupled on a rocking phone, so a rotation-dominated event does not establish that the vibration source was rotational rather than translation with the phone rocking on its surface."}, "40": {"question": "Are apparent vibration events actually tiny rotations/rocking of the phone rather than translational acceleration?", "measured": "upstairs: median |w|/|a| 0.126 (p25 0.069, p75 0.16) over 3 events, 0% rotation-dominated; gyro handling time 5.34 s downstairs: median |w|/|a| 0.047 (p25 0.039, p75 0.056) over 2 events, 0% rotation-dominated; gyro handling time 3.05 s", "interpretation": "A ratio below 1 means translation dominates the recorded motion; events above the ratio are rotation-dominated and are flagged as such in the per-event evidence.", "not_established": "The ratio is indicative only and depends on the event window and on the physical coupling of the two sensors, so whether a specific event was rocking rather than translating is not established.", "evidence": {"upstairs": {"per_event_ratio": {"n": 3, "median": 0.12580275522766557, "p25": 0.06877151850602839, "p75": 0.16023314082899018, "fraction_rotation_dominated": 0.0, "definition": "peak |w| / peak |a| per detected event"}, "gyro": {"available": true, "max_rad_s": 11.3827, "median_rad_s": 0.003197, "p99_rad_s": 0.0051, "handling_seconds": 5.34, "handling_periods": 9, "note": "gyroscope activity above 0.5 rad/s is phone handling, not structural rotation"}, "handling_flag_definition": "peak |w| above 0.5 rad/s"}, "downstairs": {"per_event_ratio": {"n": 2, "median": 0.04740849108052744, "p25": 0.03897026205165566, "p75": 0.055846720109399235, "fraction_rotation_dominated": 0.0, "definition": "peak |w| / peak |a| per detected event"}, "gyro": {"available": true, "max_rad_s": 12.4072, "median_rad_s": 0.004718, "p99_rad_s": 0.0067, "handling_seconds": 3.05, "handling_periods": 15, "note": "gyroscope activity above 0.5 rad/s is phone handling, not structural rotation"}, "handling_flag_definition": "peak |w| above 0.5 rad/s"}}, "method": "per-event peak gyro magnitude divided by peak resultant acceleration", "confidence": "medium", "caveats": ["The ratio is indicative only because the sensors are physically coupled."], "trust": {"status": "tentative", "confidence": "medium", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "gyro/accelerometer coupling", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: upstairs: median |w|/|a| 0.126 (p25 0.069, p75 0.16) over 3 events, 0% rotation-dominated; gyro handling time 5.34 s downstairs: median |w|/|a| 0.047 (p25 0.039, p75 0.056) over 2 events, 0% rotation-dominated; gyro handling time 3.05 s\nINTERPRETATION: A ratio below 1 means translation dominates the recorded motion; events above the ratio are rotation-dominated and are flagged as such in the per-event evidence.\nNOT ESTABLISHED: The ratio is indicative only and depends on the event window and on the physical coupling of the two sensors, so whether a specific event was rocking rather than translating is not established."}, "41": {"question": "Do magnetic-field changes occur simultaneously on both phones?", "measured": "The two |B| series correlate at r = 0.5478 with the upstairs series offset by -3.5778 s, and their median coherence over the shared window is 0.0003 against a significance level of 0.0011 (significant=False). Two phones in two rooms sit in different static fields, so equality is not expected; a weak shared low-frequency magnetic variation (mains wiring, large appliances) is a plausible but unproven reading.", "interpretation": "Cross-correlating the two |B| series over the overlap, and comparing the coherence of that pair with the significance level for the segment count, tests whether any magnetic variation is seen by both phones, which would point at a shared electrical or moving-metal source.", "not_established": "Two phones sitting in different static magnetic fields cannot establish a shared magnetic source: a coincident deviation is evidence only, and phone magnetometer filtering and drift limit what can be concluded.", "evidence": {"available": true, "channel_pair": "|B|", "n_samples": 3960004, "lag_s": -3.57777, "r": 0.54784, "median_coherence": 0.00027, "coherence_significance": 0.00113, "coherence_significant": false, "method": "common 100.000 Hz grid, normalised cross-correlation, Welch coherence"}, "method": "resample |B| onto the common grid over the overlap, then normalised cross-correlation and Welch coherence of the two |B| series", "confidence": "medium", "caveats": ["A house has a static magnetic field gradient; the two phones sit in different fields, so a shared source must show as a coincident deviation, not an equal value."], "trust": {"status": "tentative", "confidence": "medium", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "different static fields at the two sites", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"coherence_significance": 0.00113, "n_samples": 3960004}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: The two |B| series correlate at r = 0.5478 with the upstairs series offset by -3.5778 s, and their median coherence over the shared window is 0.0003 against a significance level of 0.0011 (significant=False). Two phones in two rooms sit in different static fields, so equality is not expected; a weak shared low-frequency magnetic variation (mains wiring, large appliances) is a plausible but unproven reading.\nINTERPRETATION: Cross-correlating the two |B| series over the overlap, and comparing the coherence of that pair with the significance level for the segment count, tests whether any magnetic variation is seen by both phones, which would point at a shared electrical or moving-metal source.\nNOT ESTABLISHED: Two phones sitting in different static magnetic fields cannot establish a shared magnetic source: a coincident deviation is evidence only, and phone magnetometer filtering and drift limit what can be concluded."}, "42": {"question": "Are magnetic-field disturbances correlated with vibration events, potentially indicating nearby electrical equipment or moving metal?", "measured": "Per-site magnetic versus vibration: {\"downstairs\": {\"anomaly_seconds\": 0.0, \"fraction_events_above_3sigma\": 0.5, \"log_corr_with_vibration\": null, \"median_event_delta_uT\": 0.9745, \"median_uT\": 84.3172, \"sigma_uT\": 0.38383}, \"upstairs\": {\"anomaly_seconds\": 0.05, \"fraction_events_above_3sigma\": 0.3333, \"log_corr_with_vibration\": null, \"median_event_delta_uT\": 0.82, \"median_uT\": 57.2123, \"sigma_uT\": 0.34935}}", "interpretation": "The magnetic change measured inside each vibration-event window, and the fraction of events whose change exceeds three robust sigmas of the magnetic channel, show whether magnetic and mechanical disturbances happen together.", "not_established": "Phone magnetometer output is aggressively filtered and drifts, so a coincidence does not establish nearby electrical equipment or moving metal as the source of either signal.", "evidence": {"upstairs": {"available": true, "median_uT": 57.2123, "robust_sigma_uT": 0.34935, "max_uT": 60.8194, "anomaly_threshold_uT": 59.3084, "anomaly_seconds": 0.05, "method": "excursion beyond median + 6 robust sigma", "computed_in_questions_py": true, "median_event_delta_uT": 0.82, "fraction_events_above_3sigma": 0.3333, "recurrence": {"n_flagged_samples": 625, "flagged_fraction": 0.00014, "interval_quantiles_s": {"p0": 43896.062, "p1": 43896.062, "p5": 43896.062, "p25": 43896.062, "p50": 43896.062, "p75": 43896.062, "p95": 43896.062, "p99": 43896.062, "p100": 43896.062}}}, "downstairs": {"available": true, "median_uT": 84.3172, "robust_sigma_uT": 0.38383, "max_uT": 85.5907, "anomaly_threshold_uT": 86.6202, "anomaly_seconds": 0.0, "method": "excursion beyond median + 6 robust sigma", "computed_in_questions_py": true, "median_event_delta_uT": 0.9745, "fraction_events_above_3sigma": 0.5, "recurrence": {"n_flagged_samples": 71368, "flagged_fraction": 0.01622, "interval_quantiles_s": {"p0": 0.501, "p1": 0.51, "p5": 0.53, "p25": 0.729, "p50": 1.21, "p75": 3.229, "p95": 85.0754, "p99": 1904.39132, "p100": 5861.986}}}}, "method": "per-event magnetic excursion against the site magnetic robust sigma, plus the anomalous-time total from the sensor checks", "confidence": "medium-low", "caveats": ["Treat these as coincidences to investigate, not measurements."], "trust": {"status": "tentative", "confidence": "medium-low", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "magnetometer filtering and drift", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Per-site magnetic versus vibration: {\"downstairs\": {\"anomaly_seconds\": 0.0, \"fraction_events_above_3sigma\": 0.5, \"log_corr_with_vibration\": null, \"median_event_delta_uT\": 0.9745, \"median_uT\": 84.3172, \"sigma_uT\": 0.38383}, \"upstairs\": {\"anomaly_seconds\": 0.05, \"fraction_events_above_3sigma\": 0.3333, \"log_corr_with_vibration\": null, \"median_event_delta_uT\": 0.82, \"median_uT\": 57.2123, \"sigma_uT\": 0.34935}}\nINTERPRETATION: The magnetic change measured inside each vibration-event window, and the fraction of events whose change exceeds three robust sigmas of the magnetic channel, show whether magnetic and mechanical disturbances happen together.\nNOT ESTABLISHED: Phone magnetometer output is aggressively filtered and drifts, so a coincidence does not establish nearby electrical equipment or moving metal as the source of either signal."}, "43": {"question": "Do particular magnetic disturbances repeat at regular intervals?", "measured": "Interval quantiles of magnetic excursions beyond median + 4 robust sigma: {\"downstairs\": {\"p0\": 0.501, \"p1\": 0.51, \"p100\": 5861.986, \"p25\": 0.729, \"p5\": 0.53, \"p50\": 1.21, \"p75\": 3.229, \"p95\": 85.0754, \"p99\": 1904.39132}, \"upstairs\": {\"p0\": 43896.062, \"p1\": 43896.062, \"p100\": 43896.062, \"p25\": 43896.062, \"p5\": 43896.062, \"p50\": 43896.062, \"p75\": 43896.062, \"p95\": 43896.062, \"p99\": 43896.062}}. Flagged samples: {\"downstairs\": 71368, \"upstairs\": 625}.", "interpretation": "A regular interval distribution or a clear autocorrelation peak in the excursion train would indicate a repeating magnetic disturbance rather than random drift.", "not_established": "Single intervals are weak evidence: the number of flagged samples is small, the phone filtering varies with firmware, and a machine cycle is not established from the interval distribution alone.", "evidence": {"upstairs": {"n_flagged_samples": 625, "flagged_fraction": 0.00014, "interval_quantiles_s": {"p0": 43896.062, "p1": 43896.062, "p5": 43896.062, "p25": 43896.062, "p50": 43896.062, "p75": 43896.062, "p95": 43896.062, "p99": 43896.062, "p100": 43896.062}}, "downstairs": {"n_flagged_samples": 71368, "flagged_fraction": 0.01622, "interval_quantiles_s": {"p0": 0.501, "p1": 0.51, "p5": 0.53, "p25": 0.729, "p50": 1.21, "p75": 3.229, "p95": 85.0754, "p99": 1904.39132, "p100": 5861.986}}}, "method": "interval distribution of flagged magnetic excursions (median + 4 robust sigma), grouped in questions.py when the analysis layer does not score it", "confidence": "low", "caveats": ["Use the interval distribution as a candidate pattern, not as proof of a cycle."], "trust": {"status": "tentative", "confidence": "low", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "few flagged excursions", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Interval quantiles of magnetic excursions beyond median + 4 robust sigma: {\"downstairs\": {\"p0\": 0.501, \"p1\": 0.51, \"p100\": 5861.986, \"p25\": 0.729, \"p5\": 0.53, \"p50\": 1.21, \"p75\": 3.229, \"p95\": 85.0754, \"p99\": 1904.39132}, \"upstairs\": {\"p0\": 43896.062, \"p1\": 43896.062, \"p100\": 43896.062, \"p25\": 43896.062, \"p5\": 43896.062, \"p50\": 43896.062, \"p75\": 43896.062, \"p95\": 43896.062, \"p99\": 43896.062}}. Flagged samples: {\"downstairs\": 71368, \"upstairs\": 625}.\nINTERPRETATION: A regular interval distribution or a clear autocorrelation peak in the excursion train would indicate a repeating magnetic disturbance rather than random drift.\nNOT ESTABLISHED: Single intervals are weak evidence: the number of flagged samples is small, the phone filtering varies with firmware, and a machine cycle is not established from the interval distribution alone."}, "44": {"question": "Do sound-level spikes in the dB channel coincide with accelerometer events?", "measured": "upstairs: dB-versus-acceleration correlation 0.017, lag -0.1305 s; loud 0 s, vibration 6.74 s, both 0 s; microphone median 31.104, p99 42.104 (uncalibrated) downstairs: dB-versus-acceleration correlation 0.016, lag -0.056 s; loud 2.43 s, vibration 4.42 s, both 0.22 s; microphone median 31.822, p99 47.084 (uncalibrated)", "interpretation": "The correlation between the dB channel and the acceleration channel, together with the number of seconds that are loud, vibrating or both (excursions beyond median + 6 robust sigma in each channel), shows how often sound and vibration move together.", "not_established": "The dB channel is uncalibrated, weighted and filtered differently per device and saturates, so a coincidence does not establish that the sound and the vibration came from the same physical source.", "evidence": {"upstairs": {"acoustic": {"available": true, "median": 31.104, "p1": 17.139, "p99": 42.104, "range": 51.144, "note": "in-app microphone level, not a calibrated SPL"}, "sound_vs_vibration": {"available": true, "r_dB_vs_aT": 0.01687, "lag_s": -0.1305, "lag_r": 0.01828, "loud_seconds": 0.0, "vibration_seconds": 6.74, "both_seconds": 0.0, "sound_without_vibration_seconds": 0.0, "vibration_without_sound_seconds": 6.74, "method": "excursions beyond median + 6 robust sigma in each channel"}, "cross_phone_acoustic": {"available": true, "channel_pair": "dB (microphone level)", "n_samples": 3960004, "lag_s": 0.48669, "r": 0.57533, "median_coherence": 0.00033, "coherence_significance": 0.00113, "coherence_significant": false, "method": "common 100.000 Hz grid, normalised cross-correlation, Welch coherence"}}, "downstairs": {"acoustic": {"available": true, "median": 31.822, "p1": 20.072, "p99": 47.084, "range": 56.643, "note": "in-app microphone level, not a calibrated SPL"}, "sound_vs_vibration": {"available": true, "r_dB_vs_aT": 0.01582, "lag_s": -0.056, "lag_r": 0.01695, "loud_seconds": 2.43, "vibration_seconds": 4.42, "both_seconds": 0.22, "sound_without_vibration_seconds": 2.21, "vibration_without_sound_seconds": 4.2, "method": "excursions beyond median + 6 robust sigma in each channel"}, "cross_phone_acoustic": {"available": true, "channel_pair": "dB (microphone level)", "n_samples": 3960004, "lag_s": 0.48669, "r": 0.57533, "median_coherence": 0.00033, "coherence_significance": 0.00113, "coherence_significant": false, "method": "common 100.000 Hz grid, normalised cross-correlation, Welch coherence"}}}, "method": "excursion counts beyond median + 6 robust sigma in the dB and acceleration channels, plus their normalised cross-correlation", "confidence": "medium", "caveats": ["The microphone band and weighting are not calibrated."], "trust": {"status": "tentative", "confidence": "medium", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "dB channel weighting/saturation; uncalibrated microphone", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: upstairs: dB-versus-acceleration correlation 0.017, lag -0.1305 s; loud 0 s, vibration 6.74 s, both 0 s; microphone median 31.104, p99 42.104 (uncalibrated) downstairs: dB-versus-acceleration correlation 0.016, lag -0.056 s; loud 2.43 s, vibration 4.42 s, both 0.22 s; microphone median 31.822, p99 47.084 (uncalibrated)\nINTERPRETATION: The correlation between the dB channel and the acceleration channel, together with the number of seconds that are loud, vibrating or both (excursions beyond median + 6 robust sigma in each channel), shows how often sound and vibration move together.\nNOT ESTABLISHED: The dB channel is uncalibrated, weighted and filtered differently per device and saturates, so a coincidence does not establish that the sound and the vibration came from the same physical source."}, "45": {"question": "Are there strong vibration events with little or no corresponding acoustic event?", "measured": "upstairs: 6.74 s of vibration excursions with no loud sound out of 6.74 s of vibration time (0 s had both) downstairs: 4.2 s of vibration excursions with no loud sound out of 4.42 s of vibration time (0.22 s had both)", "interpretation": "Seconds in which the acceleration channel exceeds its median + 6 robust sigma while the dB channel does not are the candidates for strong vibration with little or no corresponding acoustic event.", "not_established": "\"Weak sound\" can also mean sound outside the microphone band or below its noise floor, so the absence of a corresponding acoustic event is not established from this threshold count.", "evidence": {"upstairs": {"sound_vs_vibration": {"available": true, "r_dB_vs_aT": 0.01687, "lag_s": -0.1305, "lag_r": 0.01828, "loud_seconds": 0.0, "vibration_seconds": 6.74, "both_seconds": 0.0, "sound_without_vibration_seconds": 0.0, "vibration_without_sound_seconds": 6.74, "method": "excursions beyond median + 6 robust sigma in each channel"}, "acoustic": {"available": true, "median": 31.104, "p1": 17.139, "p99": 42.104, "range": 51.144, "note": "in-app microphone level, not a calibrated SPL"}}, "downstairs": {"sound_vs_vibration": {"available": true, "r_dB_vs_aT": 0.01582, "lag_s": -0.056, "lag_r": 0.01695, "loud_seconds": 2.43, "vibration_seconds": 4.42, "both_seconds": 0.22, "sound_without_vibration_seconds": 2.21, "vibration_without_sound_seconds": 4.2, "method": "excursions beyond median + 6 robust sigma in each channel"}, "acoustic": {"available": true, "median": 31.822, "p1": 20.072, "p99": 47.084, "range": 56.643, "note": "in-app microphone level, not a calibrated SPL"}}}, "method": "seconds flagged as vibration excursions without a simultaneous loud excursion (median + 6 robust sigma in each channel)", "confidence": "medium", "caveats": ["The dB channel saturates and is weighted/filtered differently per device."], "trust": {"status": "tentative", "confidence": "medium", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "dB channel band/saturation", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: upstairs: 6.74 s of vibration excursions with no loud sound out of 6.74 s of vibration time (0 s had both) downstairs: 4.2 s of vibration excursions with no loud sound out of 4.42 s of vibration time (0.22 s had both)\nINTERPRETATION: Seconds in which the acceleration channel exceeds its median + 6 robust sigma while the dB channel does not are the candidates for strong vibration with little or no corresponding acoustic event.\nNOT ESTABLISHED: \"Weak sound\" can also mean sound outside the microphone band or below its noise floor, so the absence of a corresponding acoustic event is not established from this threshold count."}, "46": {"question": "Conversely, are there loud acoustic events that cause essentially no measurable structural vibration?", "measured": "upstairs: 0 s of loud sound with no vibration excursion out of 0 s of loud time downstairs: 2.21 s of loud sound with no vibration excursion out of 2.43 s of loud time", "interpretation": "The mirror image of Q45: seconds in which the dB channel is loud while the acceleration channel stays below its excursion threshold are the candidates for sound that did not couple into the structure.", "not_established": "The count is threshold-based and the acceleration channel is only compared against the same phone's floor, so \"essentially no measurable structural vibration\" is not established for any individual acoustic event.", "evidence": {"upstairs": {"sound_vs_vibration": {"available": true, "r_dB_vs_aT": 0.01687, "lag_s": -0.1305, "lag_r": 0.01828, "loud_seconds": 0.0, "vibration_seconds": 6.74, "both_seconds": 0.0, "sound_without_vibration_seconds": 0.0, "vibration_without_sound_seconds": 6.74, "method": "excursions beyond median + 6 robust sigma in each channel"}, "acoustic": {"available": true, "median": 31.104, "p1": 17.139, "p99": 42.104, "range": 51.144, "note": "in-app microphone level, not a calibrated SPL"}}, "downstairs": {"sound_vs_vibration": {"available": true, "r_dB_vs_aT": 0.01582, "lag_s": -0.056, "lag_r": 0.01695, "loud_seconds": 2.43, "vibration_seconds": 4.42, "both_seconds": 0.22, "sound_without_vibration_seconds": 2.21, "vibration_without_sound_seconds": 4.2, "method": "excursions beyond median + 6 robust sigma in each channel"}, "acoustic": {"available": true, "median": 31.822, "p1": 20.072, "p99": 47.084, "range": 56.643, "note": "in-app microphone level, not a calibrated SPL"}}}, "method": "seconds flagged as loud-sound excursions without a simultaneous vibration excursion (median + 6 robust sigma in each channel)", "confidence": "medium", "caveats": ["Pure acoustic events below the vibration threshold are counted, but an inaudible vibration outside the band is not."], "trust": {"status": "tentative", "confidence": "medium", "n_events": 5, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "threshold-based scoring", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: upstairs: 0 s of loud sound with no vibration excursion out of 0 s of loud time downstairs: 2.21 s of loud sound with no vibration excursion out of 2.43 s of loud time\nINTERPRETATION: The mirror image of Q45: seconds in which the dB channel is loud while the acceleration channel stays below its excursion threshold are the candidates for sound that did not couple into the structure.\nNOT ESTABLISHED: The count is threshold-based and the acceleration channel is only compared against the same phone's floor, so \"essentially no measurable structural vibration\" is not established for any individual acoustic event."}, "47": {"question": "For events appearing in both sound and acceleration, does sound arrive at the phones at a measurably different relationship than the structural vibration?", "measured": "Per-site sound-versus-vibration lag: {\"downstairs\": -0.056, \"upstairs\": -0.1305}. Cross-phone sound lag 0.4867 s (r=0.5753); cross-phone vibration delay not available.", "interpretation": "Comparing the sound-versus-vibration lag at each site with the cross-phone vibration delay tests whether the acoustic path behaves differently from the structural path.", "not_established": "Airborne sound crossing a house takes a few milliseconds, which is below the timing resolution of the common grid, so any measured difference is dominated by clock and filter delay and the relationship is not established.", "evidence": {"cross_phone_acoustic": {"available": true, "channel_pair": "dB (microphone level)", "n_samples": 3960004, "lag_s": 0.48669, "r": 0.57533, "median_coherence": 0.00033, "coherence_significance": 0.00113, "coherence_significant": false, "method": "common 100.000 Hz grid, normalised cross-correlation, Welch coherence"}, "per_site": {"upstairs": -0.1305, "downstairs": -0.056}, "sound_vs_vibration": {"upstairs": {"available": true, "r_dB_vs_aT": 0.01687, "lag_s": -0.1305, "lag_r": 0.01828, "loud_seconds": 0.0, "vibration_seconds": 6.74, "both_seconds": 0.0, "sound_without_vibration_seconds": 0.0, "vibration_without_sound_seconds": 6.74, "method": "excursions beyond median + 6 robust sigma in each channel"}, "downstairs": {"available": true, "r_dB_vs_aT": 0.01582, "lag_s": -0.056, "lag_r": 0.01695, "loud_seconds": 2.43, "vibration_seconds": 4.42, "both_seconds": 0.22, "sound_without_vibration_seconds": 2.21, "vibration_without_sound_seconds": 4.2, "method": "excursions beyond median + 6 robust sigma in each channel"}}, "cross_phone_vibration": {"available": false, "method": "linear fit of unwrapped cross-spectrum phase inside one contiguous coherent band", "note": "no contiguous band reached the coherence threshold", "coh_min": 0.5, "measured_before_clock_correction": false, "raw_uncorrected": {"available": false, "delay_s": null, "delay_ms": null, "f_lo_hz": null, "f_hi_hz": null, "n_bins": null, "r2": null, "band_coherence_median": null, "note": "no contiguous band reached the coherence threshold"}, "clock_correction_applied": false, "delay_meaning": "delay_s is the cross-spectrum phase delay measured on the UNCORRECTED grid, so it includes any clock offset and is only a propagation time if the clocks are independently known; delay_after_clock_fit_s is the residual left by the clock model", "resolvable": false}}, "method": "lag between the dB channel and the acceleration channel at each site, then the same comparison across the two phones", "confidence": "low-medium", "caveats": ["Airborne sound would cross a house in a few ms, far below one sample at the common rate; any measured difference is dominated by clock and filter delay."], "trust": {"status": "unsupported", "confidence": "low-medium", "n_events": null, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "timing resolution", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: Per-site sound-versus-vibration lag: {\"downstairs\": -0.056, \"upstairs\": -0.1305}. Cross-phone sound lag 0.4867 s (r=0.5753); cross-phone vibration delay not available.\nINTERPRETATION: Comparing the sound-versus-vibration lag at each site with the cross-phone vibration delay tests whether the acoustic path behaves differently from the structural path.\nNOT ESTABLISHED: Airborne sound crossing a house takes a few milliseconds, which is below the timing resolution of the common grid, so any measured difference is dominated by clock and filter delay and the relationship is not established.\nTRUST: unsupported (timing resolution)"}, "48": {"question": "Can anomalous GPS/location changes while the phones are stationary be identified and removed rather than interpreted as physical movement? The sample already illustrates why this matters: the reported GPS speed changes despite the device apparently being stationary.", "measured": "GPS/position artefacts per site: {\"downstairs\": {\"available\": true, \"fix_span_m\": 4.22, \"integrated_speed_m\": 1.31, \"lat_median\": 27.548969, \"lon_median\": -80.362244, \"n_fixes\": 4399380, \"n_speed_missing\": 0, \"speed_max_mps\": 0.248}, \"upstairs\": {\"available\": true, \"fix_span_m\": 32.06, \"integrated_speed_m\": 530.38, \"lat_median\": 27.548864, \"lon_median\": -80.362122, \"n_fixes\": 4390299, \"n_speed_missing\": 424, \"speed_max_mps\": 2.142}}", "interpretation": "Comparing the stability of the fix with the reported speed, and integrating the reported speed against the actual fix displacement, identifies GPS rows whose movement cannot be real while the phones are stationary.", "not_established": "The artefacts are identified and excluded from movement interpretation, but with no independent ground-truth position a true displacement of a stationary phone is not established either way.", "evidence": {"upstairs": {"available": true, "n_fixes": 4390299, "fix_span_m": 32.06, "lat_median": 27.548864, "lon_median": -80.362122, "n_speed_missing": 424, "speed_max_mps": 2.142, "integrated_speed_m": 530.38}, "downstairs": {"available": true, "n_fixes": 4399380, "fix_span_m": 4.22, "lat_median": 27.548969, "lon_median": -80.362244, "n_speed_missing": 0, "speed_max_mps": 0.248, "integrated_speed_m": 1.31}}, "method": "compare the stability of the fix to the reported speed; integrate the reported speed and compare with the fix displacement; flag sentinels and invalid fixes", "confidence": "high for the artefacts; the removal rule is conservative", "caveats": ["Rows flagged as GPS artefacts are excluded from movement interpretation but are still present in json/; nothing is deleted."], "trust": {"status": "tentative", "confidence": "high for the artefacts; the removal rule is conservative", "n_events": null, "n_pairs": null, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "GPS sentinels / stale fixes", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: GPS/position artefacts per site: {\"downstairs\": {\"available\": true, \"fix_span_m\": 4.22, \"integrated_speed_m\": 1.31, \"lat_median\": 27.548969, \"lon_median\": -80.362244, \"n_fixes\": 4399380, \"n_speed_missing\": 0, \"speed_max_mps\": 0.248}, \"upstairs\": {\"available\": true, \"fix_span_m\": 32.06, \"integrated_speed_m\": 530.38, \"lat_median\": 27.548864, \"lon_median\": -80.362122, \"n_fixes\": 4390299, \"n_speed_missing\": 424, \"speed_max_mps\": 2.142}}\nINTERPRETATION: Comparing the stability of the fix with the reported speed, and integrating the reported speed against the actual fix displacement, identifies GPS rows whose movement cannot be real while the phones are stationary.\nNOT ESTABLISHED: The artefacts are identified and excluded from movement interpretation, but with no independent ground-truth position a true displacement of a stationary phone is not established either way."}, "49": {"question": "Are there long-term sensor biases, drift, temperature-like trends, orientation changes, dropped samples, or sampling-rate changes that need to be corrected before comparing the phones?", "measured": "upstairs (csv/multi_1791026911.329183 2.csv): sampling 100 Hz (rate changes 0, gaps beyond 5x median 1, largest gap 0.435 s, median interval 0.01 s); gravity tilt change 0.065 deg; orientation drift 47.49 deg max; largest accelerometer DC change 0.0085 m/s^2; exclusions [\"1 timestamp gaps longer than 5x the median interval\"] | downstairs (csv/multi_1791027086.65238.csv): sampling 100 Hz (rate changes 0, gaps beyond 5x median 1, largest gap 2.744 s, median interval 0.01 s); gravity tilt change 0.053 deg; orientation drift 3.9 deg max; largest accelerometer DC change 0.0021 m/s^2; exclusions [\"1 timestamp gaps longer than 5x the median interval\"]. Concrete correction rules used here: per-recording axis medians are removed before every RMS/PSD (so static bias cannot masquerade as vibration), both recordings are resampled onto the common 100 Hz grid (usable band up to 45 Hz), and GPS rows flagged in Q48 are excluded from movement interpretation. Temperature was not recorded, so \"temperature-like\" can only mean a slow monotonic block-median trend (see per-site longterm.bias).", "interpretation": "Sampling health (gaps, duplicate timestamps, rate spread), gravity-vector orientation drift and slow block-median DC trends determine which corrections must be applied before the two phones can be compared.", "not_established": "Temperature was not recorded, so a temperature-like trend cannot be established; only a slow monotonic block-median trend is visible, and an absolute bias correction for either unit is not established.", "evidence": {"upstairs": {"available": true, "dropouts": {"n_gaps": 1, "largest_gap_s": 0.435, "median_interval_s": 0.01}, "bias": {"ax": {"bias_start_ms2": -0.0005, "bias_end_ms2": -0.0007, "drift_ms2_per_h": -2.276e-05, "baseline_change_ms2": -0.0002}, "ay": {"bias_start_ms2": -0.001, "bias_end_ms2": -0.0021, "drift_ms2_per_h": 1.87e-06, "baseline_change_ms2": -0.0011}, "az": {"bias_start_ms2": 0.0064, "bias_end_ms2": 0.0149, "drift_ms2_per_h": 0.00030799, "baseline_change_ms2": 0.0085}}, "gravity": {"g_mean_ms2": 1.00079, "g_std_ms2": 0.00396, "block_median_range_ms2": 0.001141, "tilt_change_deg_approx": 0.065}, "orientation": {"roll": {"start_deg": 2.58, "end_deg": 2.55, "range_deg": 0.05}, "pitch": {"start_deg": 1.1, "end_deg": 1.08, "range_deg": 0.03}, "yaw": {"start_deg": 35.34, "end_deg": 82.83, "range_deg": 47.49}}, "rate": {"blocks": 147, "n_rate_changes": 0}, "exclusions": ["1 timestamp gaps longer than 5x the median interval"]}, "downstairs": {"available": true, "dropouts": {"n_gaps": 1, "largest_gap_s": 2.744, "median_interval_s": 0.01}, "bias": {"ax": {"bias_start_ms2": -0.0001, "bias_end_ms2": -0.0006, "drift_ms2_per_h": -5e-08, "baseline_change_ms2": -0.0005}, "ay": {"bias_start_ms2": 0.0006, "bias_end_ms2": -0.0002, "drift_ms2_per_h": 1.355e-05, "baseline_change_ms2": -0.0008}, "az": {"bias_start_ms2": 0.0045, "bias_end_ms2": 0.0024, "drift_ms2_per_h": 0.0002582, "baseline_change_ms2": -0.0021}}, "gravity": {"g_mean_ms2": 1.00016, "g_std_ms2": 0.002529, "block_median_range_ms2": 0.00092, "tilt_change_deg_approx": 0.053}, "orientation": {"roll": {"start_deg": -0.21, "end_deg": -0.23, "range_deg": 0.07}, "pitch": {"start_deg": 1.7, "end_deg": 1.72, "range_deg": 0.07}, "yaw": {"start_deg": -123.89, "end_deg": -120.06, "range_deg": 3.9}}, "rate": {"blocks": 147, "n_rate_changes": 0}, "exclusions": ["1 timestamp gaps longer than 5x the median interval"]}}, "method": "block medians for drift, gravity-vector angle for orientation, timestamp gaps and duplicates for dropouts and rate changes", "confidence": "high for dropouts and rate; medium for drift as a temperature proxy", "caveats": ["Temperature was not recorded, so \"temperature-like\" can only mean a slow monotonic block-median trend."], "trust": {"status": "tentative", "confidence": "high for dropouts and rate; medium for drift as a temperature proxy", "n_events": null, "n_pairs": null, "time_coverage_s": 43903.002, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no temperature channel", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"upstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "downstairs_threshold_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}]}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: upstairs (csv/multi_1791026911.329183 2.csv): sampling 100 Hz (rate changes 0, gaps beyond 5x median 1, largest gap 0.435 s, median interval 0.01 s); gravity tilt change 0.065 deg; orientation drift 47.49 deg max; largest accelerometer DC change 0.0085 m/s^2; exclusions [\"1 timestamp gaps longer than 5x the median interval\"] | downstairs (csv/multi_1791027086.65238.csv): sampling 100 Hz (rate changes 0, gaps beyond 5x median 1, largest gap 2.744 s, median interval 0.01 s); gravity tilt change 0.053 deg; orientation drift 3.9 deg max; largest accelerometer DC change 0.0021 m/s^2; exclusions [\"1 timestamp gaps longer than 5x the median interval\"]. Concrete correction rules used here: per-recording axis medians are removed before every RMS/PSD (so static bias cannot masquerade as vibration), both recordings are resampled onto the common 100 Hz grid (usable band up to 45 Hz), and GPS rows flagged in Q48 are excluded from movement interpretation. Temperature was not recorded, so \"temperature-like\" can only mean a slow monotonic block-median trend (see per-site longterm.bias).\nINTERPRETATION: Sampling health (gaps, duplicate timestamps, rate spread), gravity-vector orientation drift and slow block-median DC trends determine which corrections must be applied before the two phones can be compared.\nNOT ESTABLISHED: Temperature was not recorded, so a temperature-like trend cannot be established; only a slow monotonic block-median trend is visible, and an absolute bias correction for either unit is not established."}, "50": {"question": "After correcting clock offset, sensor bias, orientation and sampling differences, which physical events can be demonstrated statistically to be common to both locations rather than coincidence or sensor noise?", "measured": "0 matched event pairs out of 3 upstairs / 2 downstairs detections (expected random matches not available). Median per-event amplification not available over 0 pairs; sign test unavailable Median cross-phone window correlation 0 (quiet) / 0.001 (active). Clock offset estimate -3.3718 s estimated from the shared timeline. Cross-phone coherence median 0, p90 0.001.", "interpretation": "After the clock correction and the bias/orientation/sampling handling recorded per site, the supported statement is which detections are coincident beyond the random-match expectation with a consistent amplitude relationship. Verdict: NO SHARED SIGNAL ABOVE THE NOISE FLOOR", "not_established": "Demonstrating a shared physical source needs a synchronised or triggered recording: coincidence statistics do not identify the equipment, the room of origin, or a structural defect.", "evidence": {"coincidence_stats": null, "event_matching": {"tolerance_s": 1.5, "near_tolerance_s": 5.0, "n_a": 0, "n_b": 0, "n_matched": 0, "n_unmatched_up": 0, "n_unmatched_down": 0, "matched_up_indices": [], "matched_down_indices": [], "unmatched_up_indices": [], "unmatched_down_indices": [], "closest_pair_s": null, "offset_s_median": null, "offset_s_mad": null, "offset_s_quantiles": null, "note": "a match means both sites had an independent detection inside the tolerance window; unmatched detections are reported as such, and threshold differences make weak shared events look one-sided", "upstairs_events": 0, "downstairs_events": 0, "events_window": "only detections with onset inside the analysed window are matched", "matched_pairs": 0, "unmatched_upstairs": 0, "unmatched_downstairs": 0}, "amplification_summary": {"available": false, "n_pairs": 0, "verdict": "INSUFFICIENT MATCHED EVENTS", "verdict_reason": "fewer than 4 matched events carry a usable amplitude ratio, so the direction of amplification cannot be established", "decision_rule": "UPSTAIRS/DOWNSTAIRS SUPPORTED requires >=4 matched events, a bootstrap CI that excludes 1.0 and a median ratio outside 0.8-1.25; anything else is NO CLEAR DIRECTION", "note_no_excitation": "without a shared event there is no excitation to amplify, so all-time ratios measure the phones and their mounting, not the building"}, "peak_ratio_stats": null, "windows": {"available": true, "window_s": 300.0, "n_windows": 132, "classification_rule": "windows sorted by combined acceleration RMS; quiet = lowest 20 %, active = highest 20 %, normal = the rest", "classification_is_independent_of_correlation": true, "windows": [{"window": 0, "class": "quiet", "start_s": 0.0, "end_s": 300.0, 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"fraction_above_significance": 0.075}, "12-32 Hz": {"n_bins": 600, "median_coherence": 0.00028, "fraction_above_significance": 0.0517}, "32-45 Hz": {"n_bins": 390, "median_coherence": 0.00025, "fraction_above_significance": 0.0615}}, "channel": "aVert", "method": "magnitude-squared coherence, 30 s Hann segments, 50% overlap, on the signed vertical channel", "multiplicity": {"available": true, "method": "Benjamini-Hochberg FDR on the per-bin null coherence distribution Beta(1, n_seg-1), p = (1 - c)**(n_seg-1)", "alpha": 0.05, "n_bins": 1351, "n_seg": 2639, "n_above_alpha_threshold": 83, "expected_false_positives": 67.5, "n_surviving_fdr": 0, "fraction_surviving_fdr": 0.0, "q_min": 0.16203, "median_p_value": 0.48549, "surviving_bins": [], "verdict": "no bin survives FDR: the bins above the single-bin threshold are consistent with multiplicity", "note": "with 1351 bins at alpha = 0.05, about 68 bins cross the threshold by chance alone; q-values account for that", "family_wise_test": {"observed_max_coh": 0.00331, "observed_max_coh_freq_hz": 19.8, "surrogate_max_p95": 0.00371, "p_value": 0.1791, "significant": false, "mode": "permute", "n_segments": 2639, "note": "the maximum-coherence test is family-wise: a single cherry-picked bin must beat the surrogate distribution of the maximum, not just the per-bin threshold"}, "combined_verdict": "no bin survives FDR control", "individual_bins_established": false, "candidate_feature": null, "summary_line": "median 0.0003, p90 0.0009, max 0.0033 over 1351 bins; no bin survives FDR"}, "headline_finding": "median 0.0003, p90 0.0009, max 0.0033 over 1351 bins; no bin survives FDR", "surrogate_test": {"available": true, "method": "segment-permutation surrogates", "mode": "permute", "n_segments": 2639, "nperseg": 3000, "median_coh": 0.00027, "surrogate_median": 0.00026, "surrogate_p95": 0.00028, "p_value": 0.22886, "n_surrogates": 200, "significant": false, "observed_max_coh": 0.00331, "observed_max_coh_freq_hz": 19.8, "surrogate_max_median": 0.00283, "surrogate_max_p95": 0.00371, "max_coh_p_value": 0.1791, "max_coh_significant": false, "max_test_note": "the maximum-coherence test is family-wise: a single cherry-picked bin must beat the surrogate distribution of the maximum, not just the per-bin threshold", "significance_note": "p is the fraction of segment-permuted surrogates whose median (or maximum) coherence is at least as large as observed"}}, "clock": {"offset_s": -3.371819, "slope_s_per_s": 0.0, "drift_s": 0.0, "drift_ppm": 0.0, "method": "cross-correlation peak lag (no matched events)", "n_anchors": 0, "ci_s": null, "applied": false, "note": "estimate only - the UTC hour grid is the alignment, no shift was applied to the data", "estimated": true, "correction_form": "none applied (UTC hour grid is the alignment)", "corrected_overlap_s": 39600.0}, "common_signal": {"verdict": "NO SHARED SIGNAL ABOVE THE NOISE FLOOR", "evidence": ["matched event pairs: 0 of 0 upstairs / 0 downstairs detections", "median coherence 0.0003 (significance level 0.0011), fraction of bins above significance 0.061", "surrogate test: p = 0.22886 over 200 circular time shifts (median surrogate coherence 0.00026)", "corrected correlation r = 0.0282 (approx. 95% threshold 0.007, variance explained 0.080%)", "clock model: not applied (estimate only - the UTC hour grid is the alignment, no shift was applied to the data)", "the correlation is statistically detectable only because of the sample count: |r| < 0.05, i.e. it explains less than 0.25% of the variance"], "criteria": {"coherence_above_significance": false, "three_or_more_matched_events": false, "correlation_significant": true, "correlation_exceeds_effect_size": false, "variance_explained": 0.000795, "min_effect_size_abs_r": 0.05, "surrogate_not_contradicting": false}, "note": "\"no shared signal above the noise floor\" is a statement about this measurement, not proof that the building does not vibrate"}, "corrections_applied": {"clock": "cross-correlation peak lag (no matched events)", "bias": "per-recording axis medians removed before all RMS/FFT work", "orientation": "reported per site (Q49); no rotation applied because the two phones were not mounted in a known common frame", "sampling": "both recordings resampled onto the common grid over the overlap"}, "statistical_test_used": "sign test on per-event amplification ratios and the coincidence rate against the random-match expectation"}, "method": "event matching + sign test + random-match expectation + coherence", "confidence": "medium", "caveats": [], "trust": {"status": "unsupported", "confidence": "medium", "n_events": 5, "n_pairs": 0, "time_coverage_s": 39600.0, "frequency_resolution_hz": 0.033333, "timing_resolution_s": 0.01, "limiting_factor": "no matched event pairs within the tolerance", "assumptions": ["UTC timestamps are used as recorded by each phone; the two phone clocks are not hardware-synchronised", "resultant |a| (aT) drives detection; signed channels drive spectral work", "per-recording axis medians are removed before RMS/PSD work, so static bias cannot masquerade as vibration"], "sensitivity_result": {"match_tolerance_s": 1.5, "loose_tolerance_s": 5.0}, "nyquist_guard": {"checked": true, "fmax_safe_hz": 45.0, "nyquist_hz": 50.0, "claims": [], "violations": []}}, "short_answer": "MEASURED: 0 matched event pairs out of 3 upstairs / 2 downstairs detections (expected random matches not available). Median per-event amplification not available over 0 pairs; sign test unavailable Median cross-phone window correlation 0 (quiet) / 0.001 (active). Clock offset estimate -3.3718 s estimated from the shared timeline. Cross-phone coherence median 0, p90 0.001.\nINTERPRETATION: After the clock correction and the bias/orientation/sampling handling recorded per site, the supported statement is which detections are coincident beyond the random-match expectation with a consistent amplitude relationship. Verdict: NO SHARED SIGNAL ABOVE THE NOISE FLOOR\nNOT ESTABLISHED: Demonstrating a shared physical source needs a synchronised or triggered recording: coincidence statistics do not identify the equipment, the room of origin, or a structural defect.\nTRUST: unsupported (no matched event pairs within the tolerance)"}},"site_analyses":{"upstairs": [{"stem": "multi_1791026911.329183 2", "label": "upstairs", "note": "assigned by GPS position (same fix as the 0099 upstairs phone); not user-confirmed", "source_file": "csv/multi_1791026911.329183 2.csv", "rows": 4390299, "fs_hz": 100.000095, "span_s": 43903.002, "t0_iso_utc": "2026-10-02T23:16:48.310Z", "t1_iso_utc": "2026-10-03T11:28:31.312Z", "clock": "utc", "nyquist_hz": 50.000048, "fmax_safe_hz": 45.000043, "available": true, "background": {"noise_floor_rms_p50_ms2": 0.005432343, "quiet_rms_p10_ms2": 0.00487121, "active_rms_p90_ms2": 0.006047913, "quiet_sigma_ms2": 0.010389668, "ac_std_ms2": 0.033583131, "rms_1s_quantiles": {"p0": 0.003735, "p1": 0.004446, "p5": 0.004718, "p25": 0.005133, "p50": 0.005432, "p75": 0.005748, "p95": 0.006244, "p99": 0.006694, "p100": 5.214226}, "rms_60s_quantiles": {"p0": 0.004898, "p1": 0.005078, "p5": 0.005184, "p25": 0.005324, "p50": 0.005462, "p75": 0.005574, "p95": 0.005765, "p99": 0.006446, "p100": 0.163121}, "envelope_median_ms2": 0.004364014, "envelope_p999_ms2": 0.007123169, "envelope_robust_sigma_ms2": 0.000702605, "method": "single-pole 0.2 Hz high-pass, 0.25 s envelope, 1 s RMS blocks", "note": "sensor noise level: this is the scale of the quietest vibration this phone can report"}, "axes": {"axes": {"ax": {"rms_ms2": 0.023906698, "std_ms2": 0.023906698, "p99_abs_ms2": 0.017752701, "share_of_energy": 0.1948}, "ay": {"rms_ms2": 0.028106796, "std_ms2": 0.028106796, "p99_abs_ms2": 0.017414232, "share_of_energy": 0.26926}, "az": {"rms_ms2": 0.039653176, "std_ms2": 0.039653176, "p99_abs_ms2": 0.019694702, "share_of_energy": 0.53593}, "vertical_signed": {"rms_ms2": 0.040582906, "std_ms2": 0.039848324}, "horizontal": {"rms_ms2": 0.036737308, "std_ms2": 0.035608333}, "resultant": {"rms_ms2": 0.054741229, "std_ms2": 0.052948417}}, "gravity_available": true, "gravity_unit_body_frame": [0.044466, -0.018885, -0.998832], "comparable_across_phones": ["vertical_signed", "horizontal", "resultant"], "not_comparable_across_phones": ["ax", "ay", "az"], "note": "body-frame x/y/z axes point in different physical directions on the two phones, so only the gravity-aligned vertical, the horizontal energy and the resultant may be compared between them; the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ", "robustness_note": "plain RMS is dominated by rare samples, not by continuous vibration: for aT the top 0.01% of samples carry 98.43% of the total energy, so the plain RMS 0.052956 m/s^2 collapses to 0.005635 m/s^2 once samples above the 99.9th percentile are removed (9.4x), while the robust sigma is 0.003336 m/s^2 and the 1 s background is the right measure of continuous motion"}, "bands": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 2.68727e-07, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.000518389, "fraction": 0.00519}, "0.5-1 Hz": {"power": 6.23567e-07, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.000789662, "fraction": 0.01205}, "1-2 Hz": {"power": 1.281386e-06, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.001131983, "fraction": 0.02477}, "2-4 Hz": {"power": 2.547237e-06, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.001596006, "fraction": 0.04924}, "4-8 Hz": {"power": 5.135895e-06, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002266251, "fraction": 0.09928}, "8-16 Hz": {"power": 1.0158585e-05, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.003187253, "fraction": 0.19638}, "16-32 Hz": {"power": 1.8966732e-05, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.004355081, "fraction": 0.36665}, "32-64 Hz": {"power": 1.2747203e-05, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.003570323, "fraction": 0.24642}}, "total_power": 5.1729332e-05, "total_rms_ms2": 0.007192311, "fmax_hz": 45.0}, "spectral_line_hypotheses": {"available": true, "lines": [], "noise_floor_median_psd": 1.208563e-06, "noise_floor_sigma_psd": 1.22807e-07, "detection_threshold_psd": 2.191017e-06, "fmax_safe_hz": 45.0, "interpretation_caveat": "these are band-based hypotheses for equipment classes, not identifications of specific devices; a definitive call needs a labelled on/off test"}, "clusters": {"available": false, "n_events_with_spectra": 3, "note": "fewer than 6 events carry a usable spectrum, so clustering would not be meaningful"}, "sensor_checks": {"available": true, "stem": "multi_1791026911.329183 2", "label": "upstairs", "gyro": {"available": true, "max_rad_s": 11.3827, "median_rad_s": 0.003197, "p99_rad_s": 0.0051, "handling_seconds": 5.34, "handling_periods": 9, "note": "gyroscope activity above 0.5 rad/s is phone handling, not structural rotation"}, "magnetic": {"available": true, "median_uT": 57.2123, "robust_sigma_uT": 0.34935, "max_uT": 60.8194, "anomaly_threshold_uT": 59.3084, "anomaly_seconds": 0.05, "method": "excursion beyond median + 6 robust sigma"}, "acoustic": {"available": true, "median": 31.104, "p1": 17.139, "p99": 42.104, "range": 51.144, "note": "in-app microphone level, not a calibrated SPL"}, "pressure": {"available": true, "median_Pa": 101615.0156, "std_Pa": 444.01871, "range_Pa": 101687.5312}, "gps": {"available": true, "n_fixes": 4390299, "fix_span_m": 32.06, "lat_median": 27.548864, "lon_median": -80.362122, "n_speed_missing": 424, "speed_max_mps": 2.142, "integrated_speed_m": 530.38}, "event_sensor_flags": [{"t_iso_utc": "2026-10-02T23:16:53.310Z", "peak_w_rad_s": 0.004860041197389364, "snr_db": 15.577, "handling_flag": false}, {"t_iso_utc": "2026-10-02T23:17:05.770Z", "peak_w_rad_s": 0.005537147168070078, "snr_db": 10.133, "handling_flag": false}, {"t_iso_utc": "2026-10-03T11:28:26.312Z", "peak_w_rad_s": 0.007176349870860577, "snr_db": 42.735, "handling_flag": false}], "events_with_gyro_activity": 0}, "longterm": {"available": true, "dropouts": {"n_gaps": 1, "largest_gap_s": 0.435, "median_interval_s": 0.01}, "bias": {"ax": {"bias_start_ms2": -0.0005, "bias_end_ms2": -0.0007, "drift_ms2_per_h": -2.276e-05, "baseline_change_ms2": -0.0002}, "ay": {"bias_start_ms2": -0.001, "bias_end_ms2": -0.0021, "drift_ms2_per_h": 1.87e-06, "baseline_change_ms2": -0.0011}, "az": {"bias_start_ms2": 0.0064, "bias_end_ms2": 0.0149, "drift_ms2_per_h": 0.00030799, "baseline_change_ms2": 0.0085}}, "gravity": {"g_mean_ms2": 1.00079, "g_std_ms2": 0.00396, "block_median_range_ms2": 0.001141, "tilt_change_deg_approx": 0.065}, "orientation": {"roll": {"start_deg": 2.58, "end_deg": 2.55, "range_deg": 0.05}, "pitch": {"start_deg": 1.1, "end_deg": 1.08, "range_deg": 0.03}, "yaw": {"start_deg": 35.34, "end_deg": 82.83, "range_deg": 47.49}}, "rate": {"blocks": 147, "median_hz": 100.0001, "min_hz": 100.0001, "max_hz": 100.0001, "n_rate_changes": 0}, "exclusions": ["1 timestamp gaps longer than 5x the median interval"]}, "integrity": {"source_file": "csv/multi_1791026911.329183 2.csv", "stem": "multi_1791026911.329183 2", "sha256": "8a503f2145fce71b02b56479235a70b55f44377fdfe7ae1e64761d5d38a4fabf", "sha256_source": "meta.source_sha256", "bytes": 916576302, "rows": 4390299, "duration_s": 43903.002, "fs_hz_measured": 100.0001, "fs_nominal_hz": null, "meta_rate_hz": 100.000095, "dt_median_s": 0.00999999, "dt_mean_s": 0.010000005, "dt_jitter_std_s": 0.000747354, "dt_jitter_pct": 7.473547, "dt_method": "single streaming pass over the time vector in 200000-row blocks", "dt_median_method": "exact median and std over the dt window +/-0.0025 s around the sampled estimate", "time_resolution_s": null, "fs_hz_from": "median dt", "fs_hz_from_mean_dt": 99.99995, "n_finite_time_values": 4390299, "time_finite_fraction": 1.0, "time_vector_usable": true, "largest_gap_s": 0.434999943, "n_gaps": 1, "gap_threshold_s": 0.049999952, "gap_seconds_total": 0.435, "n_gap_spans": 1, "duplicate_timestamps": 0, "non_monotonic_timestamps": 0, "n_intervals": 4390298, "n_missing_time_values": 0, "missing_by_sensor": {"BMag": null, "Bx": {"n": 0, "pct": 0.0}, "By": {"n": 0, "pct": 0.0}, "Bz": {"n": 0, "pct": 0.0}, "P": {"n": 0, "pct": 0.0}, "aHoriz": null, "aT": null, "aVert": null, "altitude": {"n": 0, "pct": 0.0}, "ax": {"n": 0, "pct": 0.0}, "ay": {"n": 0, "pct": 0.0}, "az": {"n": 0, "pct": 0.0}, "dB": {"n": 0, "pct": 0.0}, "gFx": {"n": 0, "pct": 0.0}, "gFy": {"n": 0, "pct": 0.0}, "gFz": {"n": 0, "pct": 0.0}, "gMag": null, "latitude": {"n": 0, "pct": 0.0}, "longitude": {"n": 0, "pct": 0.0}, "pitch": {"n": 0, "pct": 0.0}, "roll": {"n": 0, "pct": 0.0}, "speed": {"n": 424, "pct": 0.009658}, "time": {"n": 0, "pct": 0.0}, "wMag": null, "wx": {"n": 0, "pct": 0.0}, "wy": {"n": 0, "pct": 0.0}, "wz": {"n": 0, "pct": 0.0}, "yaw": {"n": 0, "pct": 0.0}}, "sensor_columns_present": ["ax", "ay", "az", "gFx", "gFy", "gFz", "wx", "wy", "wz", "P", "Bx", "By", "Bz", "dB", "latitude", "longitude", "altitude", "speed", "yaw", "pitch", "roll"], "absent_sensors": [], "extra_columns": [], "clock_kind": "utc", "clock_note": "UTC clock: 2026-10-02T23:16:48.310Z .. 2026-10-03T11:28:31.312Z (43903.002 s)", "clock": {"kind": "utc", "note": "UTC clock: 2026-10-02T23:16:48.310Z .. 2026-10-03T11:28:31.312Z (43903.002 s)", "t0_unix": 1790983008.31, "t1_unix": 1791026911.312, "t0_iso_utc": "2026-10-02T23:16:48.310Z", "t1_iso_utc": "2026-10-03T11:28:31.312Z", "span_s": 43903.002}, "identity": {"label": "upstairs", "note": "assigned by GPS position (same fix as the 0099 upstairs phone); not user-confirmed", "phone_model_note": "the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"}, "orientation_stability": {"available": true, "source": "recorded yaw/pitch/roll columns", "roll_std_deg": 0.911199, "pitch_std_deg": 29.166918, "yaw_std_deg": 14.03878, "roll_drift_deg": -1.718872, "pitch_drift_deg": -1.145914, "yaw_drift_deg": 45.665001, "tilt_change_deg": 0.081442, "n_blocks": 21951, "block_s": 2.0, "method": "block medians of recorded yaw/pitch/roll in 200-sample blocks (~2.0 s); tilt change = angle between the mean gravity direction of the first and last 5% of blocks", "note": null}, "gravity_stability": {"available": true, "mean_ms2": 1.000787358, "std_ms2": 0.003523529, "min_ms2": 0.262097748, "max_ms2": 5.193395525, "p50_ms2": 1.00076905, "trend_per_hour_ms2": -3.678e-06, "tilt_change_deg": 81.834331, "tilt_p50_deg": 1.386854, "p95_tilt_deg": 1.403377, "tilt_max_deg": 81.834331, "n_blocks": 21951, "method": "|g| mean/std over all samples plus 200-sample block medians (~2.0 s); tilt = angle between each block gravity direction and the first block", "note": null}, "gyro_handling_periods": {"available": true, "threshold_rad_s": 0.5, "n": 4, "seconds": 5.529995, "max_w_rad_s": 10.60169, "examples": [{"start_s": 0.719999, "duration_s": 0.829999, "peak_w_rad_s": 2.7973}, {"start_s": 1.809998, "duration_s": 0.33, "peak_w_rad_s": 1.4056}, {"start_s": 2.359998, "duration_s": 0.5, "peak_w_rad_s": 2.1439}, {"start_s": 43899.058296, "duration_s": 3.869996, "peak_w_rad_s": 10.4591}], "n_samples_above": 544, "pct_time_above": 0.012391, "columns": ["wx", "wy", "wz"], "method": "|w| from wx+wy+wz above 0.5 rad/s; consecutive runs merged across dropouts shorter than 0.2 s", "note": null}, "usable_freq_range_hz": [0.0, 45.000045], "nyquist_hz": 50.00005, "fmax_safe_hz": 45.000045, "gps_artifacts": {"available": true, "n_sentinels": 424, "sentinel_value": -1.0, "sentinel_columns": ["speed", "altitude"], "sentinel_count_source": "meta.gps_sentinels.count (higher than measured)", "fix_span_m": 32.062876, "fix_span_method": "equirectangular bounding box: dNS = dLat * 111320 m, dEW = dLon * 111320 * cos(box-centre latitude) m, span = diagonal", "lat_range_m": 18.26004, "lon_range_m": 26.355245, "n_fix_valid": 4390299, "n_bad_fix": 0, "n_fix_missing": 0, "integrated_speed_m": 530.378532, "integrated_speed_n_points": 4389874, "moving_while_fix_static": true, "speed_max_mps": 2.142, "speed_median_mps": 0.012079, "n_speed_sentinel": 0, "n_altitude_sentinel": 0, "altitude_median_m": 5.134913, "altitude_range_m": 12.4958, "note": "424 sentinel value(s) -1.0 in speed/altitude. GPS position fixes span only 32.063 m while the trapezoid integral of the reported speed is 530.379 m: the speed column reports motion the position fixes do not show.", "source": "latitude, longitude, speed, altitude", "integrated_speed_method": "np.trapezoid-equivalent streaming trapezoid of speed on the time vector, sentinel/NaN samples treated as missing", "fix_center_lat_deg": 27.548908234, "fix_center_lon_deg": -80.362224579}, "exclusions": ["start/stop trim window of 5.0 s at each end (handling while the recording is started and stopped)", "1 gap span(s) where dt > 5.0 x the median interval (0.435 s total)", "GPS sentinel value -1.0 in speed/altitude (recorded as missing, not motion)"], "valid_fraction": 0.999782475, "valid_fraction_detail": {"n_rows": 4390299, "n_excluded_trim": 955, "n_excluded_gaps": 0, "n_excluded_nonfinite_vibration_in_window": 0, "n_excluded_nonfinite_vibration_total": 0, "n_usable": 4389344, "vibration_channels_used": ["ax", "ay", "az"], "rule": "usable = rows - trim window - gap spans - non-finite samples in ax/ay/az inside the analysis window"}, "trim_window_s": 5.0, "trim_window_index": [498, 4389842], "notes": ["measured rate 100.0001 Hz differs from meta.sampling.fs_hz 100.000095 Hz", "sampling interval 0.01 s median, jitter 7.4735% (0.000747 s std)", "largest gap 0.435 s is 43.5x the median interval", "GPS artefacts: 424 sentinel value(s) (-1.0) in speed/altitude", "GPS inconsistency: integrated speed 530.379 m vs GPS fix span 32.063 m", "gyroscope handling: 4 period(s), 5.53 s total above 0.5 rad/s (peak 10.602 rad/s)", "gravity direction changed by 0.081 deg between the first and last 5% of the recording (mounting/orientation drift)", "99.98% of samples are usable for vibration analysis after exclusions"], "array_hashes": {"verified": true, "mode": "npy header + partial sha256", "n_meta_entries": 28, "n_checked": 28, "n_header_parsed": 28, "n_complete_hash": 0, "n_partial_hash": 28, "n_files_missing": 0, "mismatches": [], "notes": ["28 array file(s) hashed only partially (bounded read budget)"]}, "integrity_version": "1.0.0", "required_keys_present": true, "keys_missing": [], "gate": {"passed": true, "failures": [], "warnings": ["1 gap(s) with dt > 5x the median interval; largest 0.435 s", "GPS sentinel value -1.0: 424 sample(s) in speed/altitude", "GPS inconsistency: integrated speed 530.379 m vs fix span 32.063 m", "gyroscope handling: 4 period(s), 5.53 s, peak 10.602 rad/s"]}}, "exclusions": ["first/last 5.0 s removed from event detection (button handling)", "424 GPS sentinel (-1) values treated as missing"], "valid_fraction": 1.0, "event_count": 3, "events_by_tier": {"high": 3, "sensitive": 3}, "event_sweep": [{"percentile": 99.0, "threshold_ms2": 0.006223005, "events": 5, "threshold_over_median": 1.426}, {"percentile": 99.5, "threshold_ms2": 0.006463973, "events": 5, "threshold_over_median": 1.481}, {"percentile": 99.9, "threshold_ms2": 0.007028708, "events": 6, "threshold_over_median": 1.611}, {"percentile": 99.95, "threshold_ms2": 0.007314385, "events": 6, "threshold_over_median": 1.676}, {"percentile": 99.99, "threshold_ms2": 0.011091612, "events": 2, "threshold_over_median": 2.542}], "sub_threshold_candidates": {"n": 3, "examples": [{"t_onset": 1790983017.501, "t_peak": 1790983017.67, "duration_s": 0.2390000820159912, "peak_env_ms2": 0.01092299, "snr_db": 7.969, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791016433.111, "t_peak": 1791016433.401, "duration_s": 0.869999885559082, "peak_env_ms2": 0.013042269, "snr_db": 9.51, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018496.649, "t_peak": 1791018496.799, "duration_s": 0.4810001850128174, "peak_env_ms2": 0.008921577, "snr_db": 6.211, "reason": "SNR below the 10 dB high-confidence floor"}], "note": "excursions that cleared the amplitude threshold but were not separable from the noise floor; they are reported so the reader can see what was rejected", "threshold_rule": "percentile 99.9 of the site envelope, capped at median + 20 robust sigma", "snr_floor_db": 10.0}, "periodicity": {"available": true, "method": "autocorrelation of the smoothed |a| envelope, decimated to 4.0 Hz with a mean-removed FFT", "env_rate_hz": 4.0, "max_lag_s": 3600.0, "candidates": [], "interpretation": "an autocorrelation peak at lag L means the envelope repeats roughly every L seconds; peaks below ~0.2 are weak and are not evidence of a periodic machine"}, "spectrum": {"freqs_hz": [0.0, 0.0333, 0.0667, 0.1, 0.1333, 0.1667, 0.2, 0.2333, 0.2667, 0.3, 0.3333, 0.3667, 0.4, 0.4333, 0.4667, 0.5, 0.5333, 0.5667, 0.6, 0.6333, 0.6667, 0.7, 0.7333, 0.7667, 0.8, 0.8333, 0.8667, 0.9, 0.9333, 0.9667, 1.0, 1.0333, 1.0667, 1.1, 1.1333, 1.1667, 1.2, 1.2333, 1.2667, 1.3, 1.3333, 1.3667, 1.4, 1.4333, 1.4667, 1.5, 1.5333, 1.5667, 1.6, 1.6333, 1.6667, 1.7, 1.7333, 1.7667, 1.8, 1.8333, 1.8667, 1.9, 1.9333, 1.9667, 2.0, 2.0333, 2.0667, 2.1, 2.1333, 2.1667, 2.2, 2.2333, 2.2667, 2.3, 2.3333, 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"f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "1-2 Hz": {"power": 0.0, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "2-4 Hz": {"power": 0.0, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "4-8 Hz": {"power": 5.636725e-06, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002374179, "fraction": 0.15117}, "8-16 Hz": {"power": 6.25951e-06, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002501901, "fraction": 0.16787}, "16-32 Hz": {"power": 1.8872929e-05, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.004344298, "fraction": 0.50613}, "32-64 Hz": {"power": 6.519347e-06, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.002553301, "fraction": 0.17484}}, "total_power": 3.7288512e-05, "total_rms_ms2": 0.006106432, "fmax_hz": 45.0}, "spectrum_unavailable": null, "zeta": 0.012875, "damping": {"available": true, "method": "log-linear fit of the envelope decay after the peak", "formula": "zeta = 1 / sqrt(1 + (2*pi*f*tau)^2)", "tau_s": 0.79108, "zeta": 0.012875, "f_hz": 15.625, "r2": 0.5592, "n_points": 71, "monotone_fraction": 0.614, "quality": "low", "baseline_ms2": 0.004363833, "peak_env_ms2": 0.014012943, "note": "decay fit is low; a single impulse-like event is needed before this damping ratio means anything"}}, {"index": 3, "tier": "high", "t_onset": 1791026905.022, "t_peak": 1791026906.312, "t_end": 1791026906.312, "duration_s": 1.2899999618530273, "peak_env": 0.5978831341784098, "peak_aT": 0.6112587417110886, "baseline_ms2": 0.004363833, "detector_threshold_ms2": 0.007028708, "snr_db": 42.735, "rms_aT": 0.3047453870815819, "rms_vert": 0.019010181393646616, "peak_vert": 0.0674729786970445, "peak_w": 0.007176349870860577, "g_change": 0.010625660419464111, "decay_tau_s": null, "t_iso_utc": "2026-10-03T11:28:26.312Z", "handling_flag": false, "dominant_hz": 12.5, "spectral_peaks": [{"freq_hz": 12.5, "psd": 3.57146e-06, "prominence": 3.086664e-06, "ratio_to_median": 2.812}, {"freq_hz": 31.25, "psd": 3.003245e-06, "prominence": 2.447982e-06, "ratio_to_median": 2.365}, {"freq_hz": 35.9375, "psd": 2.499675e-06, "prominence": 1.200847e-06, "ratio_to_median": 1.968}], "centroid_hz": 25.094, "band_power": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 0.0, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "0.5-1 Hz": {"power": 0.0, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "1-2 Hz": {"power": 0.0, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "2-4 Hz": {"power": 0.0, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.0, "fraction": 0.0}, "4-8 Hz": {"power": 2.298779e-06, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.001516172, "fraction": 0.04216}, "8-16 Hz": {"power": 1.443313e-05, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.003799096, "fraction": 0.26469}, "16-32 Hz": {"power": 1.682605e-05, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.004101957, "fraction": 0.30857}, "32-64 Hz": {"power": 2.0970649e-05, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.004579372, "fraction": 0.38458}}, "total_power": 5.4528608e-05, "total_rms_ms2": 0.007384349, "fmax_hz": 45.0}, "spectrum_unavailable": null, "zeta": null, "damping": {"available": false, "method": "log-linear fit of the envelope decay after the peak", "formula": "zeta = 1 / sqrt(1 + (2*pi*f*tau)^2)", "note": "decay too short or already at the baseline", "tau_s": null}}]}], "downstairs": [{"stem": "multi_1791027086.65238", "label": "downstairs", "note": "assigned by GPS position (same fix as the 8701 downstairs phone); not user-confirmed", "source_file": "csv/multi_1791027086.65238.csv", "rows": 4399380, "fs_hz": 100.000095, "span_s": 43995.507, "t0_iso_utc": "2026-10-02T23:18:11.110Z", "t1_iso_utc": "2026-10-03T11:31:26.617Z", "clock": "utc", "nyquist_hz": 50.000048, "fmax_safe_hz": 45.000043, "available": true, "background": {"noise_floor_rms_p50_ms2": 0.004526903, "quiet_rms_p10_ms2": 0.004083349, "active_rms_p90_ms2": 0.005030887, "quiet_sigma_ms2": 0.02965233, "ac_std_ms2": 0.029170073, "rms_1s_quantiles": {"p0": 0.003107, "p1": 0.003743, "p5": 0.003964, "p25": 0.00429, "p50": 0.004527, "p75": 0.004778, "p95": 0.005199, "p99": 0.00559, "p100": 3.734345}, "rms_60s_quantiles": {"p0": 0.004342, "p1": 0.004379, "p5": 0.004416, "p25": 0.004475, "p50": 0.004532, "p75": 0.004599, "p95": 0.004758, "p99": 0.00539, "p100": 0.535113}, "envelope_median_ms2": 0.003635746, "envelope_p999_ms2": 0.005869159, "envelope_robust_sigma_ms2": 0.000570086, "method": "single-pole 0.2 Hz high-pass, 0.25 s envelope, 1 s RMS blocks", "note": "sensor noise level: this is the scale of the quietest vibration this phone can report"}, "axes": {"axes": {"ax": {"rms_ms2": 0.032926342, "std_ms2": 0.032926342, "p99_abs_ms2": 0.017506562, "share_of_energy": 0.53161}, "ay": {"rms_ms2": 0.016962163, "std_ms2": 0.016962163, "p99_abs_ms2": 0.017222989, "share_of_energy": 0.14108}, "az": {"rms_ms2": 0.025835878, "std_ms2": 0.025835878, "p99_abs_ms2": 0.018382241, "share_of_energy": 0.32731}, "vertical_signed": {"rms_ms2": 0.025923697, "std_ms2": 0.025879712}, "horizontal": {"rms_ms2": 0.037009586, "std_ms2": 0.035970286}, "resultant": {"rms_ms2": 0.045185701, "std_ms2": 0.043728779}}, "gravity_available": true, "gravity_unit_body_frame": [-0.004099, -0.030095, -0.999539], "comparable_across_phones": ["vertical_signed", "horizontal", "resultant"], "not_comparable_across_phones": ["ax", "ay", "az"], "note": "body-frame x/y/z axes point in different physical directions on the two phones, so only the gravity-aligned vertical, the horizontal energy and the resultant may be compared between them; the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ", "robustness_note": "plain RMS is dominated by rare samples, not by continuous vibration: for aT the top 0.01% of samples carry 98.85% of the total energy, so the plain RMS 0.043734 m/s^2 collapses to 0.004657 m/s^2 once samples above the 99.9th percentile are removed (9.4x), while the robust sigma is 0.002748 m/s^2 and the 1 s background is the right measure of continuous motion"}, "bands": {"available": true, "bands": {"0.25-0.5 Hz": {"power": 2.46252e-07, "f_lo_hz": 0.25, "f_hi_hz": 0.5, "clipped_to_safe_limit": false, "rms_ms2": 0.000496238, "fraction": 0.00546}, "0.5-1 Hz": {"power": 5.59767e-07, "f_lo_hz": 0.5, "f_hi_hz": 1.0, "clipped_to_safe_limit": false, "rms_ms2": 0.000748176, "fraction": 0.01241}, "1-2 Hz": {"power": 1.161331e-06, "f_lo_hz": 1.0, "f_hi_hz": 2.0, "clipped_to_safe_limit": false, "rms_ms2": 0.00107765, "fraction": 0.02575}, "2-4 Hz": {"power": 2.183987e-06, "f_lo_hz": 2.0, "f_hi_hz": 4.0, "clipped_to_safe_limit": false, "rms_ms2": 0.001477832, "fraction": 0.04842}, "4-8 Hz": {"power": 4.405378e-06, "f_lo_hz": 4.0, "f_hi_hz": 8.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002098899, "fraction": 0.09767}, "8-16 Hz": {"power": 8.759576e-06, "f_lo_hz": 8.0, "f_hi_hz": 16.0, "clipped_to_safe_limit": false, "rms_ms2": 0.002959658, "fraction": 0.19421}, "16-32 Hz": {"power": 1.6834269e-05, "f_lo_hz": 16.0, "f_hi_hz": 32.0, "clipped_to_safe_limit": false, "rms_ms2": 0.004102959, "fraction": 0.37324}, "32-64 Hz": {"power": 1.095284e-05, "f_lo_hz": 32.0, "f_hi_hz": 45.0, "clipped_to_safe_limit": true, "rms_ms2": 0.003309507, "fraction": 0.24284}}, "total_power": 4.5103399e-05, "total_rms_ms2": 0.006715906, "fmax_hz": 45.0}, "spectral_line_hypotheses": {"available": true, "lines": [], "noise_floor_median_psd": 1.059216e-06, "noise_floor_sigma_psd": 7.4031e-08, "detection_threshold_psd": 1.651462e-06, "fmax_safe_hz": 45.0, "interpretation_caveat": "these are band-based hypotheses for equipment classes, not identifications of specific devices; a definitive call needs a labelled on/off test"}, "clusters": {"available": false, "n_events_with_spectra": 2, "note": "fewer than 6 events carry a usable spectrum, so clustering would not be meaningful"}, "sensor_checks": {"available": true, "stem": "multi_1791027086.65238", "label": "downstairs", "gyro": {"available": true, "max_rad_s": 12.4072, "median_rad_s": 0.004718, "p99_rad_s": 0.0067, "handling_seconds": 3.05, "handling_periods": 15, "note": "gyroscope activity above 0.5 rad/s is phone handling, not structural rotation"}, "magnetic": {"available": true, "median_uT": 84.3172, "robust_sigma_uT": 0.38383, "max_uT": 85.5907, "anomaly_threshold_uT": 86.6202, "anomaly_seconds": 0.0, "method": "excursion beyond median + 6 robust sigma"}, "acoustic": {"available": true, "median": 31.822, "p1": 20.072, "p99": 47.084, "range": 56.643, "note": "in-app microphone level, not a calibrated SPL"}, "pressure": {"available": true, "median_Pa": 101648.4844, "std_Pa": 44.24711, "range_Pa": 166.2344}, "gps": {"available": true, "n_fixes": 4399380, "fix_span_m": 4.22, "lat_median": 27.548969, "lon_median": -80.362244, "n_speed_missing": 0, "speed_max_mps": 0.248, "integrated_speed_m": 1.31}, "event_sensor_flags": [{"t_iso_utc": "2026-10-02T23:18:16.110Z", "peak_w_rad_s": 0.006667833309620619, "snr_db": 28.61, "handling_flag": false}, {"t_iso_utc": "2026-10-03T11:31:21.616Z", "peak_w_rad_s": 0.007368853315711021, "snr_db": 36.511, "handling_flag": false}], "events_with_gyro_activity": 0}, "longterm": {"available": true, "dropouts": {"n_gaps": 1, "largest_gap_s": 2.744, "median_interval_s": 0.01}, "bias": {"ax": {"bias_start_ms2": -0.0001, "bias_end_ms2": -0.0006, "drift_ms2_per_h": -5e-08, "baseline_change_ms2": -0.0005}, "ay": {"bias_start_ms2": 0.0006, "bias_end_ms2": -0.0002, "drift_ms2_per_h": 1.355e-05, "baseline_change_ms2": -0.0008}, "az": {"bias_start_ms2": 0.0045, "bias_end_ms2": 0.0024, "drift_ms2_per_h": 0.0002582, "baseline_change_ms2": -0.0021}}, "gravity": {"g_mean_ms2": 1.00016, "g_std_ms2": 0.002529, "block_median_range_ms2": 0.00092, "tilt_change_deg_approx": 0.053}, "orientation": {"roll": {"start_deg": -0.21, "end_deg": -0.23, "range_deg": 0.07}, "pitch": {"start_deg": 1.7, "end_deg": 1.72, "range_deg": 0.07}, "yaw": {"start_deg": -123.89, "end_deg": -120.06, "range_deg": 3.9}}, "rate": {"blocks": 147, "median_hz": 100.0001, "min_hz": 100.0001, "max_hz": 100.0001, "n_rate_changes": 0}, "exclusions": ["1 timestamp gaps longer than 5x the median interval"]}, "integrity": {"source_file": "csv/multi_1791027086.65238.csv", "stem": "multi_1791027086.65238", "sha256": "f9123b31d242e57d894bfd9605ce23cad93714e59c3de69c0e8276ae9d76f9cb", "sha256_source": "meta.source_sha256", "bytes": 940647211, "rows": 4399380, "duration_s": 43995.507, "fs_hz_measured": 100.0001, "fs_nominal_hz": null, "meta_rate_hz": 100.000095, "dt_median_s": 0.00999999, "dt_mean_s": 0.01000039, "dt_jitter_std_s": 0.000736582, "dt_jitter_pct": 7.365827, "dt_method": "single streaming pass over the time vector in 200000-row blocks", "dt_median_method": "exact median and std over the dt window +/-0.0025 s around the sampled estimate", "time_resolution_s": null, "fs_hz_from": "median dt", "fs_hz_from_mean_dt": 99.996100152, "n_finite_time_values": 4399380, "time_finite_fraction": 1.0, "time_vector_usable": true, "largest_gap_s": 2.743999958, "n_gaps": 1, "gap_threshold_s": 0.049999952, "gap_seconds_total": 2.744, "n_gap_spans": 1, "duplicate_timestamps": 0, "non_monotonic_timestamps": 0, "n_intervals": 4399379, "n_missing_time_values": 0, "missing_by_sensor": {"BMag": null, "Bx": {"n": 0, "pct": 0.0}, "By": {"n": 0, "pct": 0.0}, "Bz": {"n": 0, "pct": 0.0}, "P": {"n": 0, "pct": 0.0}, "aHoriz": null, "aT": null, "aVert": null, "altitude": {"n": 0, "pct": 0.0}, "ax": {"n": 0, "pct": 0.0}, "ay": {"n": 0, "pct": 0.0}, "az": {"n": 0, "pct": 0.0}, "dB": {"n": 0, "pct": 0.0}, "gFx": {"n": 0, "pct": 0.0}, "gFy": {"n": 0, "pct": 0.0}, "gFz": {"n": 0, "pct": 0.0}, "gMag": null, "latitude": {"n": 0, "pct": 0.0}, "longitude": {"n": 0, "pct": 0.0}, "pitch": {"n": 0, "pct": 0.0}, "roll": {"n": 0, "pct": 0.0}, "speed": {"n": 0, "pct": 0.0}, "time": {"n": 0, "pct": 0.0}, "wMag": null, "wx": {"n": 0, "pct": 0.0}, "wy": {"n": 0, "pct": 0.0}, "wz": {"n": 0, "pct": 0.0}, "yaw": {"n": 0, "pct": 0.0}}, "sensor_columns_present": ["ax", "ay", "az", "gFx", "gFy", "gFz", "wx", "wy", "wz", "P", "Bx", "By", "Bz", "dB", "latitude", "longitude", "altitude", "speed", "yaw", "pitch", "roll"], "absent_sensors": [], "extra_columns": [], "clock_kind": "utc", "clock_note": "UTC clock: 2026-10-02T23:18:11.110Z .. 2026-10-03T11:31:26.617Z (43995.507 s)", "clock": {"kind": "utc", "note": "UTC clock: 2026-10-02T23:18:11.110Z .. 2026-10-03T11:31:26.617Z (43995.507 s)", "t0_unix": 1790983091.11, "t1_unix": 1791027086.617, "t0_iso_utc": "2026-10-02T23:18:11.110Z", "t1_iso_utc": "2026-10-03T11:31:26.617Z", "span_s": 43995.507}, "identity": {"label": "downstairs", "note": "assigned by GPS position (same fix as the 8701 downstairs phone); not user-confirmed", "phone_model_note": "the phones are the same model but separate physical units; individual accelerometer calibration, mounting, cases, surface coupling and orientation may still differ"}, "orientation_stability": {"available": true, "source": "recorded yaw/pitch/roll columns", "roll_std_deg": 1.552564, "pitch_std_deg": 8.37875, "yaw_std_deg": 1.122873, "roll_drift_deg": 0.572957, "pitch_drift_deg": 0.0, "yaw_drift_deg": 3.599998, "tilt_change_deg": 0.018239, "n_blocks": 21996, "block_s": 2.0, "method": "block medians of recorded yaw/pitch/roll in 200-sample blocks (~2.0 s); tilt change = angle between the mean gravity direction of the first and last 5% of blocks", "note": null}, "gravity_stability": {"available": true, "mean_ms2": 1.000155114, "std_ms2": 0.002010083, "min_ms2": 0.51129386, "max_ms2": 1.513167595, "p50_ms2": 1.000133586, "trend_per_hour_ms2": -0.001999355, "tilt_change_deg": 21.236435, "tilt_p50_deg": 21.227344, "p95_tilt_deg": 21.250449, "tilt_max_deg": 21.308931, "n_blocks": 21996, "method": "|g| mean/std over all samples plus 200-sample block medians (~2.0 s); tilt = angle between each block gravity direction and the first block", "note": null}, "gyro_handling_periods": {"available": true, "threshold_rad_s": 0.5, "n": 2, "seconds": 3.819996, "max_w_rad_s": 12.406075, "examples": [{"start_s": 0.13, "duration_s": 3.109997, "peak_w_rad_s": 5.1687}, {"start_s": 43993.038207, "duration_s": 0.709999, "peak_w_rad_s": 12.3576}], "n_samples_above": 346, "pct_time_above": 0.007865, "columns": ["wx", "wy", "wz"], "method": "|w| from wx+wy+wz above 0.5 rad/s; consecutive runs merged across dropouts shorter than 0.2 s", "note": null}, "usable_freq_range_hz": [0.0, 45.000045], "nyquist_hz": 50.00005, "fmax_safe_hz": 45.000045, "gps_artifacts": {"available": true, "n_sentinels": 0, "sentinel_value": -1.0, "sentinel_columns": [], "sentinel_count_source": "measured from arrays", "fix_span_m": 4.22222, "fix_span_method": "equirectangular bounding box: dNS = dLat * 111320 m, dEW = dLon * 111320 * cos(box-centre latitude) m, span = diagonal", "lat_range_m": 1.910934, "lon_range_m": 3.765033, "n_fix_valid": 4399380, "n_bad_fix": 0, "n_fix_missing": 0, "integrated_speed_m": 1.308505, "integrated_speed_n_points": 4399379, "moving_while_fix_static": false, "speed_max_mps": 0.2484, "speed_median_mps": 2.5e-05, "n_speed_sentinel": 0, "n_altitude_sentinel": 0, "altitude_median_m": 3.600228, "altitude_range_m": 1.203, "note": "integrated speed (1.309 m) is consistent with the GPS fix span (4.222 m) within the 5x / 25 m tolerance.", "source": "latitude, longitude, speed, altitude", "integrated_speed_method": "np.trapezoid-equivalent streaming trapezoid of speed on the time vector, sentinel/NaN samples treated as missing", "fix_center_lat_deg": 27.548974037, "fix_center_lon_deg": -80.362224579}, "exclusions": ["start/stop trim window of 5.0 s at each end (handling while the recording is started and stopped)", "1 gap span(s) where dt > 5.0 x the median interval (2.744 s total)"], "valid_fraction": 0.999834977, "valid_fraction_detail": {"n_rows": 4399380, "n_excluded_trim": 726, "n_excluded_gaps": 0, "n_excluded_nonfinite_vibration_in_window": 0, "n_excluded_nonfinite_vibration_total": 0, "n_usable": 4398654, "vibration_channels_used": ["ax", "ay", "az"], "rule": "usable = rows - trim window - gap spans - non-finite samples in ax/ay/az inside the analysis window"}, "trim_window_s": 5.0, "trim_window_index": [500, 4399154], "notes": ["measured rate 100.0001 Hz differs from meta.sampling.fs_hz 100.000095 Hz", "sampling interval 0.01 s median, jitter 7.3658% (0.000737 s std)", "largest gap 2.744 s is 274.4x the median interval", "gyroscope handling: 2 period(s), 3.82 s total above 0.5 rad/s (peak 12.406 rad/s)", "gravity direction changed by 0.018 deg between the first and last 5% of the recording (mounting/orientation drift)", "99.98% of samples are usable for vibration analysis after exclusions"], "array_hashes": {"verified": true, "mode": "npy header + partial sha256", "n_meta_entries": 28, "n_checked": 28, "n_header_parsed": 28, "n_complete_hash": 0, "n_partial_hash": 28, "n_files_missing": 0, "mismatches": [], "notes": ["28 array file(s) hashed only partially (bounded read budget)"]}, "integrity_version": "1.0.0", "required_keys_present": true, "keys_missing": [], "gate": {"passed": true, "failures": [], "warnings": ["1 gap(s) with dt > 5x the median interval; largest 2.744 s", "gyroscope handling: 2 period(s), 3.82 s, peak 12.406 rad/s"]}}, "exclusions": ["first/last 5.0 s removed from event detection (button handling)"], "valid_fraction": 1.0, "event_count": 2, "events_by_tier": {"high": 2, "sensitive": 2}, "event_sweep": [{"percentile": 99.0, "threshold_ms2": 0.005150066, "events": 6, "threshold_over_median": 1.417}, {"percentile": 99.5, "threshold_ms2": 0.005351436, "events": 6, "threshold_over_median": 1.472}, {"percentile": 99.9, "threshold_ms2": 0.005813564, "events": 6, "threshold_over_median": 1.599}, {"percentile": 99.95, "threshold_ms2": 0.006027995, "events": 4, "threshold_over_median": 1.658}, {"percentile": 99.99, "threshold_ms2": 0.010431116, "events": 2, "threshold_over_median": 2.869}], "sub_threshold_candidates": {"n": 4, "examples": [{"t_onset": 1790983107.33, "t_peak": 1790983107.499, "duration_s": 0.24100017547607422, "peak_env_ms2": 0.007453218, "snr_db": 6.235, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018317.333, "t_peak": 1791018317.484, "duration_s": 0.6800000667572021, "peak_env_ms2": 0.00729361, "snr_db": 6.047, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018401.591, "t_peak": 1791018401.651, "duration_s": 0.2389998435974121, "peak_env_ms2": 0.007404088, "snr_db": 6.178, "reason": "SNR below the 10 dB high-confidence floor"}, {"t_onset": 1791018595.077, "t_peak": 1791018595.227, "duration_s": 0.3000001907348633, "peak_env_ms2": 0.007728569, "snr_db": 6.55, "reason": "SNR below the 10 dB high-confidence floor"}], "note": "excursions that cleared the amplitude threshold but were not separable from the noise floor; they are reported so the reader can see what was rejected", "threshold_rule": "percentile 99.9 of the site envelope, capped at median + 20 robust sigma", "snr_floor_db": 10.0}, "periodicity": {"available": true, "method": "autocorrelation of the smoothed |a| envelope, decimated to 4.0 Hz with a mean-removed FFT", "env_rate_hz": 4.0, "max_lag_s": 3600.0, "candidates": [], "interpretation": "an autocorrelation peak at lag L means the envelope repeats roughly every L seconds; peaks below ~0.2 are weak and 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see what was rejected"}, "sensitive": {"tier": "sensitive", "envelope_s": 0.25, "min_duration_s": 0.25, "merge_gap_s": 0.5, "fs_hz": 100.000095, "trim": {"start_index": 500, "end_index": 4399154, "trim_s": 5.0, "filter_applied_before_trim": true, "note": "the 0.2 Hz high-pass is applied to the whole recording before trimming, so the trim boundary cannot create an artefact"}, "threshold_rule": "rolling baseline + 6 * robust sigma", "events": 2, "baseline_window_s": 600.0, "threshold_median_ms2": 0.006905942, "baseline_median_ms2": 0.003619911, "sigma_median_ms2": 0.000547435, "envelope_median_ms2": 0.003635622, "envelope_robust_sigma_ms2": 0.000569976, "samples_above_threshold": 488, "candidate_groups": 8, "groups_passing_duration": 2, "sub_threshold_candidates": 0, "sub_threshold_examples": [], "sub_threshold_note": "excursions that cleared the amplitude threshold but were not separable from the noise floor; they are reported so the reader can see what was rejected"}}, "event_catalog": 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