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In recent years, 3-D prestack depth migration bas become a common tool to image complex geology, allowing us to correctly position steeply dipping reflectors and collapse diffraction hyperbolae at reflector/fault plane terminations. In addition to collapsing major diffractions associated with accurate structural imaging, 3-D prestack migration also collapses smaller diffraction hyperbalae associated with on-lap, off-lap, clinoforms and angular unconformities necessary to accurately map stratigraphic sequences, even in the absence of complex structure