1. n. [Geophysics]

An acoustic velocity value used during processing to produce static, vertical shifts in seismic and other time domain data in order to bring a specific point into alignment with some common elevation feature. Most often, the point in question is the 0.0 s time point, while the elevation feature is ground level. In other cases, the elevation feature may be arbitrary, such as 300 m above mean sea level.

See: average velocity,  base of weathering,  check-shot survey,  interval velocity,  static correction,  velocity,  velocity layering,  vertical seismic profile,  weathering correction