Conclusions

Elastic stiffnesses in anisotropic media can be determined by crosscorrelating the strain components of a forward-modeled shot wavefield with strain components of the backward-propagated data wavefield. This serves as an imaging condition in the case of prestack reverse time migration. Compared to one-way algorithms, such an implementation is more expensive, but provides correct amplitudes for all events without limitations in dip or ray paths. Massively parallel computers make feasable processing schemes that maintain correct amplitude information.