NMO equation

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The NMO equation defines the normal moveout function. The total reflection (or offset) time tr is given by the NMO (or zero-offset) time tn, the offset x and the velocity of the medium V:

where, for an apparent depth d to a zero-dipping reflector in the subsurface,[1]


  1. See Russell, B (1998). A simple seismic imaging exercise. The Leading Edge 17 (7), 885–889. DOI: 10.1190/1.1438059

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