1. n. [Geophysics]

A device that detects seismic energy in the form of ground motion or a pressure wave in fluid and transforms it to an electrical impulse.

See: apparent velocity,  common reflection point,  detector,  fixed-source method,  geophone,  moving-source method,  offset,  one-way time,  radial refraction,  seismic trace,  seismic-while-drilling vertical seismic profile,  static correction,  two-way traveltime,  undershooting,  walk-above vertical seismic profile (VSP),  walkaway vertical seismic profile,  zero-offset data