Though
a power series of
the type
taylor is not the best possible representation of the
traveltime curve, it
is
quite suitable for comparing different approximations in the
vicinity
of the vertical ray. In the post-stack migration problem, those approximations
imply that the reflector dips have zero mean value. If we assumed that the mean
dip
value on a particular seismic section were different from zero, we could apply
expansions different from expansion taylor. That curious
option is beyond the scope of this paper.
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