f Modelling anisotropic waves in three dimensions

A finite difference approximation to the elastic wave equation has been implemented on the parallel connection machine (CM). Realistic three dimensional Earth models can be created by a joint surface modeling package (GOCAD). To each homogeneous domain anisotropic stiffnesses may be attributed using Hudson's theory for cracks [1] or the group-theoretical formulations from Schoenberg and Muir [2]. The resulting anisotropic symmetry system can have any spatial orientation. Wavefronts in three dimensions and seismograms for a saltdome structure including anisotropic layers are shown.