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P135 THE EFFECT OF SPATIAL DISTRIBUTION ON SEISMIC WAVES IN CRACKED POROUS MEDIA M. JAKOBSEN University of Bergen Department of Earth Science (CIPR) Allegaten 41 N-5007 Bergen Norway. SUMMARY A dynamic T-matrix approach from the theory of stochastic waves (which includes the popular crack model of Hudson as a special case) is used here in two numerical experiments to estimate the overall properties of porous media containing various spatial distributions of cracks. First I illustrate the fact that the overall properties of a cracked porous medium can be anisotropic even when all the cracks (and pores) are randomly oriented (and