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Detailed Reference Information |
Chang, W., McMechan, G.A. and Keller, G.R. (1989). Wave field processing of data from a large-aperture seismic experiment in southwestern Oklahoma. Journal of Geophysical Research 94: doi: 10.1029/88JB03850. issn: 0148-0227. |
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Data from a wide-aperture survey performed in January 1985 in southwestern Oklahoma have been processed using prestack imaging, and the images are interpreted to reveal a new picture of the crustal structure in the Wichita Uplift and the Anadarko Basin. As the data were in recording apertures of approximately 90 km, it is necessary to develop new processing concepts and software. A complete new imaging system, based on common source gathers, was conceived, implemented, tested, and applied to these data. The heart of the system consists of velocity estimation by slant stacking, and acoustic prestack reverse time, finite difference migration. The migration produces reflectivity images in regions of 50 km¿100 km, has no dip restrictions, and operates in an arbirarily complicated two-dimensional velocity distribution. For comparison the data were also processed using standard common midpoint processing, but this is a less valid approach for wide-aperture data. The main ambiguities and limitations in processing and interpretation are a consequence of the small number of shots. Processing and interpretation of the data provide a new picture of the subsurface structure of southwestern Oklahoma. The environment is clearly compressive with thrust faulting as the main accommodating mechanism in the upper and central crust. Beneath a possible detachment zone at ~30 km depth the lower crust has responded to the compression by thickening by ≈50%. The Moho is interpreted to be ≈45 km in depth beneath the thrust zone, shallowing to ≈40 km beneath the Wichita Uplift and the Anadarko Basin. ¿ American Geophysical Union 1989 |
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Abstract |
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Keywords
Seismology, Continental crust, Seismology, Body wave propagation, Seismology, Lithosphere and upper mantle, Information Related to Geographic Region, North America |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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