Abstract
The finite-difference method is applied to compute the seismic response of 2-D inhomogeneous structures for SH-waves. A technique is proposed which uses an irregular grid (a rectangular grid with varying grid spacing). A geological structure may be composed of blocks of media inside of which velocity and density vary linearly in horizontal and vertical directions. The technique allows better adjusted modelling of a medium and, in numerical examples presented, yields more efficient computations as compared to those with regular grids. The technique is tested through comparison with a discrete-wavenumber method. As an example, the seismic response of the sediment-filled Chusal Valley, Garm region, USSR, is computed. The numerical results are compared with observations.
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