ZZ Resistivity Imaging Pty. Ltd.

2.5-D frequency-domain seismic wave modeling in heterogeneous, anisotropic media using a Gaussian quadrature grid technique

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We present an extension of the spectral element method (SEM), called the Gaussian quadrature grid technique, for 2.5-D frequency-domain seismic wave modeling in heterogeneous, anisotropic media having arbitrary free-surface topography. The technique has two new features. First, it employs a point-gridded model sampled by irregular Gaussian quadrature abscissa rather than a hexahedral-element mesh so as to simplify the procedures of matching the free-surface topography and the subsurface interface geometry. Furthermore, it offers flexibilities in the subdomain sizes, the Gaussian quadrature scheme and orders employed, and the number of subdomain abscissae in terms of the model geological characteristics. Second, we have incorporated a simple implementation of the 2.5-D perfectly matched layer (PML) technique to suppress the reflections from the artificial boundaries...

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