f Reverse-time migration by using a nonreflecting elastic wave equation and the eikonal equation for the imaging condition

Reverse-time migration is a type of depth migration in which the wave field observations are extrapolated in time rather than in depth. The prestack reverse-time migration is similar to the poststack depth migration except for a different imaging condition. Instead of using the amplitude values at time zero, as in poststack migration, the depth section new consists of the amplitudes at the time of arrival of the direct wave from the source.