Affiliation:
1. Center for Lithospheric Studies, The University of Texas at Dallas, P.O. Box 830688, Richardson, TX 75083-0688
Abstract
Much of the energy removed in a typical standard seismic data preprocessing sequence corresponds to approximately horizontal propagation in very near‐surface structure. Such energy includes direct (first‐break) compressional waves, direct shear waves, and ground roll; these may be effectively separated from deeper reflections by downward continuation of the recorded common‐source wavefield, by reverse‐time extrapolation, to a depth beneath which these waves propagate. The subhorizontally traveling waves get left behind in the shallow part of the model. Subsequent upward continuation of the wavefield reconstructs the original surface‐recorded wavefield with the subhorizontally traveling waves removed. Only a very simple (even constant) velocity distribution is required for the wavefield extrapolation; no net distortion is produced since both downward and upward continuations are performed using the same velocity model.
Publisher
Society of Exploration Geophysicists
Subject
Geochemistry and Petrology,Geophysics
Cited by
41 articles.
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