Abstract
The normal incidence synthetic seismograms of a few meaningfully sized geological models presented in this paper indicate that the numerical solution for the subsurface structures of interest to exploration geophysicists can be obtained by using the finite element condensation technique. In this method, a transformation matrix T is introduced which condenses the global stiffness and mass matrices in the form of parameter variables which are the Fourier coefficients. By this method there is hardly any restriction on the computer storage and speed. Another very striking aspect is its ability in automatic mesh generation depending on the anisotropism and heterogeneity in elastic properties in the subsurface. The availability of a graphics facility has added an extra dimension to this technique and thus allows us to perform forward modelling on a routine basis and have a better insight into wave propagation in a two-dimensional half space beneath the earth's surface.
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