Large-Scale Numerical Analysis of Seismic Waves in Basins.
Interim rept. 1 Oct 81-30 Sep 82,
WEIDLINGER ASSOCIATES MENLO PARK CA
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This report describes the application of a large-scale numerical wave solver to the time domain study of seismic wave phenomena in basins typical of the Basin and Range province. The solver uses an explicit finite element algorithm designed for fully vectorized execution on the CRAY-1. Calculations were performed to study the effects of basin edge geometry on reflection and transmission of body and surface waves. Normal and tangential surface traction sources were applied on the model centerline. From the resulting full wave field solution, synthetic seismograms were generated and used to quantify principal phases. In addition, the body and surface wave interaction of two basins separated by a mountain was studied. This model required 120,000 elements and demonstrated that large-scale full wave field calculations are practical on the CRAY-1.