Plural form of geophone; multiple vibration-detecting instruments used to monitor earth movements and seismic activity.
From geophone plus the standard English plural '-es.' The plural is used when discussing geophone arrays deployed across regions for seismic monitoring.
Oil companies deploy thousands of geophones in arrays across continents—they create acoustic pictures of rock layers miles underground by reading how sound bounces differently through different minerals, like ultrasound for the entire planet.
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