{
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  "id": "p1_04_ambient",
  "title": "Ambient noise over one chamber",
  "date": "2026-09-27",
  "started_utc": "2026-09-27T21:15:22+00:00",
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  "commit": "e563377",
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  ]
 },
 "volume": {
  "shape": [
   57,
   57,
   59
  ],
  "origin": [
   -13.75,
   -13.75,
   -1.25
  ],
  "spacing": 0.5,
  "quantity": "migrated passive echo amplitude",
  "units": "normalised"
 },
 "finding": "Noise correlations reproduce the wave between two geophones (correlation 0.90 with a real source). With the rock known exactly and an unlimited record, the passive echo image is 2.2x brighter around the chamber than elsewhere, and its brightest point lies 7 m from the chamber's centre. No record length reaches 3x: even averaged forever, the chamber's part of the correlations images away from it at 46% of its brightness around it."
}