Common-azimuth migration is an efficient and robust technique for obtaining accurate single-mode PP 3-D seismic images. This technique takes advantage of the reduced dimensionality of the computational domain. It assumes that the data have only the zero cross-line offset; that is, all the traces in the data share the same azimuth Biondi and Palacharla (1996). Due to the growing number of 3-D multicomponent seismic data sets in areas where an accurate processing is required to obtain better subsurface images and/or estimate rock properties, wavefield-based continuation methods, such as common-azimuth migration, for converted-mode data are of great importance and are very much needed in the oil industry today.
Converted-wave common-azimuth migration is very similar to conventional common-azimuth migration. However, it uses different propagation velocities for different wavefields. We compare the differences between single-mode and converted-mode common-azimuth migration.