1. n. [Geophysics]

A step in seismic processing in which reflections in seismic data are moved to their correct locations in space, including position relative to shotpoints, in areas where there are significant and rapid lateral or vertical changes in velocity that distort the time image. This requires an accurate knowledge of vertical and horizontal seismic velocity variations.

See: depth section,  migration,  processing,  shotpoint,  time migration,  traveltime,  velocity