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A geophone is a device that converts ground movement (i.e. seismic waves) into voltages that can be recorded by seismographs. Geophones are usually clustered together in a seismometer array. The output of a geophone is very weak and typically requires amplification before it can be recorded. Geophones are used in a variety of applications, such as oil and gas exploration, earthquake monitoring, and military intelligence. In oil and gas exploration, geophones are used to map subsurface features, such as faults and fractures.... more