Over the past few years, many techniques have been presented for updating the velocity depth model required for full-volume 3-D prestack depth migration (preSDM).

These techniques (many of which are listed in “Suggestions for further reading”) have specific theoretical or practical limitations. Furthermore, a universal limitation to date is the spatial sampling of the information used to perform the velocity estimation. Prestack-migrated velocity information (usually in the form of CRP gathers) is typically output on a coarse grid, often 500 × 500 m.

This article presents a technique for increasing the statistical reliability of the velocity information to be input...

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