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A method for the interpretation of wide-angle reflection travel-times in laterally varying crust-mantle structures is formulated. A datum correction is first carried out by ray-tracing to remove the effects of refraction above the reflector. The resulting time-distance data may be then expressed in a form which permits, given multiple coverage of the sub-surface, the independent determination of velocity and reflector topography. The method has been tested on model data and found to be effective.
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