Conclusions

We have presented a method for computing angle-domain common-image gathers from wave-equation depth-migrated images. We have shown that the method is, in essence, a radial trace transform in the Fourier domain, and therefore equivalent to a slant stack in the space domain. We used a stretch technique that enabled us to include model regularization, which leads to smooth ADCIGs. We have also shown that the method is accurate, fast, robust, easy to implement and that it can be used for real 3-D prestack data in applications related to velocity and AVA analysis.