The relative efficiency of Common Azimuth wave equation depth migration based on the double square root equation makes it an attractive engine for use in automated velocity updating schemes. One such automated velocity analysis procedure is Differential Semblance Optimization, which constructs velocity updates to reduce, and eventually minmize, a quantitative measure of image gather misfocussing. We review the construction of a differential semblance velocity analysis tool based on common azimuth migration, and present some 2D examples. These examples illustrate some of the promise, and some of the potential pitfalls, of this approach to velocity analysis.

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