Short review of retarded Snell midpoint coordinates , by Jon F. Claerbout

A convenient coordinate system in which to formulate many problems of reflection seismic data processing is the retarded, Snell, common midpoint system. It is particularly well-adapted to problems of accurate velocity estimation, migration, and migration before stack when the velocity v(z) is stratified. It also seems to have some utility in the presence of lateral velocity variation, but for this problem and the problem of diffracted multiple reflections, it may be preferable to avoid common midpoint coordinates.


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