Quasi-spherical approach for seismic wave modeling in a 2-D slice of a global Earth model with lateral heterogeneity

Details Quasi-spherical approach for seismic wave modeling in a 2-D slice of a global Earth model with lateral heterogeneity Quasi-spherical approach for seismic wave modeling in a 2-D slice of a global Earth model with lateral heterogeneity

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3209305t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 9, CiteID L09305

Statistics

Computation

5

Seismology: Body Waves, Seismology: Theory

Scientific paper

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.

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