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