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The ray tracing example in this paper shows that
ray tracing is stopped when the
tangent of the ray is close to horizontal,
because all the reflector dips in the reflectivity model
are less than 90-degree.
This is unnecessary.
Ray tracing can be continued as the ray path turns. Computation of
Gaussian beams for the turning ray path is equally possible.
When this is accomplished, Gaussian beam migration can migrate dips
up to 360-degrees. This ability can be of great utility in the migration of
earthquake seismic data.

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Stanford Exploration Project

11/17/1997