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

John H. Bradford, Lee M. Liberty, Mitch W. Lyle, William P. Clement, Scott Hess

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Prestack depth migration (PSDM) analysis has the potential to significantly improve the accuracy of both shallow seismic reflection images and the measured velocity distributions. In a study designed to image faults in the Alvord Basin, Oregon, at depths from 25-1000 m, PSDM produced a detailed reflection image over the full target depth range. In contrast, poststack time migration produced significant migration 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 interpretation of the transition from sedimentary basin fill to basement volcanic rocks. PSDM analysis revealed a complex extensional history with at least two distinct phases of basin growth and a midbasin basement high that forms the division between two major basin compartments.

Original languageEnglish
Pages (from-to)B175-B181
JournalGeophysics
Volume71
Issue number6
DOIs
StatePublished - Nov 2006

Keywords

  • Earth crust
  • Faulting
  • Rocks
  • Seismology

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