2.
n. [Geophysics]
A step in
seismic processing in which reflections in seismic data are moved to their correct locations in the x-y-time space of seismic data, including two-way
traveltime and position relative to shotpoints. Migration improves
seismic interpretation and mapping because the locations of
geological structures, especially faults, are more accurate in migrated seismic data. Proper migration collapses diffractions from secondary sources such as
reflector terminations against faults and corrects bow ties to form synclines. There are numerous methods of migration, such as dip moveout (
DMO), frequency domain, ray-
trace and
wave-equation migration.