Page 466 - Acquisition and Processing of Marine Seismic Data

9.4 QC IN VELOCITY ANALYSIS 457

FIG. 9.31 (A) An RMS velocity field with a problematic velocity function. (B) Incorrect functions are either deleted or cor-
rected after analyzing the resultant velocity field. (C) A smooth version of the RMS velocity field is sometimes used as an input
to the migration process, since rapid lateral velocity variations may produce artifacts in the migration output.