Quasi-spherical approach for seismic wave modeling in a 2-D slice of a global Earth model with lateral heterogeneity
Date
2005
Authors
Toyokuni, G
Takenaka, Hiroshi
Wang, Yanbin
Kennett, Brian
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Publisher
American Geophysical Union
Abstract
For iterative calculations of synthetic seismograms with limited computer resources, a fast and accurate modeling method is needed. Axisymmetric modeling has often been used in global seismology to restrict computational time and storage. This approach can correctly model 3-D geometrical spreading effects with computational times comparable to 2-D methods, but cannot treat asymmetric structures about the source axis. To overcome this problem, a new approach is proposed for seismic wave propagation in a 2-D slice through a global Earth model with lateral heterogeneity. The elastodynamic equation for spherical coordinates is not solved in the conventional spherical domain but instead in the "quasi-spherical domain" using the finite-difference method. The validity and efficiency of this technique is illustrated with numerical examples including subduction zone structures.
Description
Keywords
Keywords: Computational methods; Earth sciences; Finite difference method; Geometry; Iterative methods; Mathematical models; Seismology; Three dimensional; Two dimensional; Wave propagation; Earth model; Seismograms; Spherical coordinates; Subduction zones; Seismic
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Source
Geophysical Research Letters
Type
Journal article
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2037-12-31