Conclusions

Shot-profile and shot-geophone migration algorithms provide two alternatives for finite-frequency migration of prestack seismic data. For marine-type geometries shot-geophone migration will be cheaper; however, this situation is reversed for sparse-shot and sparse-receiver geometries.

For sparse-shot geometries with fully sampled receiver axes, I have shown that shot illumination plays a major role in observed seismic amplitudes. I show how this problem can be addressed by a simple model-space weighting function that can be calculated at very little cost during the migration process, and applied afterwards.