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Assuming a single source and a coincident receiver, equation 3.9 reduces
to that for poststack imaging:

where the subscript *s* denotes both the geophone and source position, which is now
coincident with the geophone.
For a homogeneous medium, this equations says that the reflection energy
is smeared onto the family
of circles
centered about the source point.

*Gerard Schuster*

*1998-07-29*