During the 1980s and 1990s, we developed a number of recursive wave-equation algorithms for prestack depth migration in the shot domain. Much of that work was driven by development of the vertical-cable recording technique. However, we applied the algorithms to image a variety of 2D and 3D land and marine surveys. Virtually all of those projects were oriented toward obtaining better structural images and without concern for preserving relative amplitude information.

Increasing interest in prestack amplitude analysis of migrated data led us to revisit that decision and to evaluate the possibility of analyzing AVO (or AVA) within image gathers. Developers...

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