Translations:Phase-shift migration/9/en

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The phase-shift method [1] can only handle vertically varying velocities. A way to accommodate lateral velocity variations judged to be acceptable for time migration is to first stretch the CMP-stacked section in the time direction so as to make it correspond to a velocity field that only varies vertically. This velocity field is obtained by averaging the original velocity field associated with the unstretched CMP-stacked section in the x direction. Following the stretching operation, the stacked section is migrated using the velocity function in the standard phase-shift migration scheme. Finally, the migrated section is unstretched.

  1. Gazdag, 1978, Gazdag, J., 1978, Wave-equation migration by phase shift: Geophysics, 43, 1342–1351.