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One of the advantages of the choice
of the midpoint-offset coordinate
to migrate the data
is that the imaging step
is both straightforward and inexpensive.
There is no need to crosscorrelate and shift wavefields,
as for shot-profile reverse-time migration
().
The equivalent of the ``stacked'' image
is obtained by selecting the
propagated wavefield at zero time and zero offset;
that is
The offset-domain Common Image Gathers (CIG) are obtained
by simply selecting the
propagated wavefield at zero time;
that is
Next: Examples of reverse time
Up: From downward continuation to
Previous: Stronger lateral velocity variations?
Stanford Exploration Project
6/7/2002