Joint migration velocity analysis of PP- and PS-waves for VTI media
Combining PP-waves with mode-converted PS reflections in migration velocity analysis can help build more accurate VTI velocity models. To avoid problems caused by the moveout asymmetry of PS-waves and take advantage of efficient MVA algorithms designed for pure modes, I suggest to generate pure SS-reflections from PP and PS data using the PP+PS=SS method. Then the residual moveout in both PP and SS common-image gathers is minimized during iterative velocity updates. The objective function also includes the differences between the migrated depths of the same reflectors on the PP and SS sections ...
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