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Notice that this is not a ray theory nor a plane-wave theory, and certainly
not a dynamic elastic wave theory. It does correspond to notions with which
explorationists are familiar, and only uses (no *v*(*z*)!) parameters
that can be estimated at the surface. Also note that this is not, despite
appearances, just a horizontal reflector theory. A kinematic diffraction
theory develops by combining half reflections from the same layer set but
with differing ray parameters for the up- and down-going waves. In other
words, there are now two independent ray parameters, *p*_{s} and *p*_{g},
and development follows most simply by considering a
source-to-scatterer-to-receiver model.

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Stanford Exploration Project

11/16/1997