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One reason to use plane-waves instead of rays is to avoid the
asymptotic approximation introduced when using rays.
Unlike rays, each plane-wave can be treated
independently at each frequency.
The use of plane-waves simply ignores the problem of non-coplanar rays.
Indeed, the original and the
rotated rays described earlier share the same plane-wave.
The reflection azimuth is the azimuth of the apparent
propagation plane which is directly deduced from the angles of the
two plane-waves.

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Stanford Exploration Project

10/14/2003