There are a number of reasons why it would be nice to directly map reflections on a time trace to their image point in depth without all the trace mixing required by conventional migration. Such one-to-one mapping would preserve the shot and receiver coordinates of the trace, thereby allowing reflections to be modeled within the framework of the data.

Consider what must be done now for velocity analysis using reflection tomography or for AVO analysis on depth-migrated traces. The first step is to create common image gathers of traces over a range of offsets. This necessitates a series of common-offset...

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