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Prestack depth migration PSDM analysis has the poten- tial to significantly improve the accuracy of both shallow seismicreflectionimagesandthemeasuredvelocitydistribu- tions.InastudydesignedtoimagefaultsintheAlvordBasin, Oregon, at depths from 25-1000 m, PSDM produced a de- tailed reflection image over the full target depth range. In contrast, poststack time migration produced significant mi- gration artifacts in the upper 100 m that obscured reflection events and limited the structural interpretation in the shallow section. Additionally, an abrupt increase from 2500 to 3000 m/s in the PSDM velocity model constrained the in- terpretation of the transition from sedimentary basin fill to basementvolcanicrocks.PSDManalysisrevealedacomplex extensional history with at least two distinct phases of basin growthandamidbasinbasementhighthatformsthedivision betweentwomajorbasincompartments.

Imaging complex structure in shallow seismic-reflection data using prestack depth migration