Migrated gathers using variable velocities. The central time-variant velocity function, and each subsequent panel, was adjusted by 1%. The red picks represent the best p-wave migration imaging velocity. The picks were made in Tsunami's interactive velocity modeling software.

Variable P-Wave Velocity Migration

• Pick the best velocities using migration
• Define any number of panels and a p-wave velocity increment
• Calculate from constant or time-varying velocities
• Define a robust and accurate velocity field by picking from the migration panels. The red Xs (see figure) mark the velocity that best images the data at that time