Migration velocity dependence of plumes

James L. Black, Dimitri Bevc, and Gopal Palacharla

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ABSTRACT

Changing the migration velocity causes the response of time migration to a point diffractor beneath a lateral velocity variation to evolve. At the extremes of migration velocity, the image is either fully undermigrated or fully overmigrated. Between these extremes, there is the mixture of overmigration and undermigration that leads to ``plume'' responses. As the velocity is changed, these plumes transform and rotate in a systematic manner. A simple first-order theory of plume velocity dependence explains some, but not all, of the observed behavior.