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3-D Conductivity Models: Implications of Electrical Anisotropy

Peter Weidelt
Peter Weidelt
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January 01, 1999


Electrical anisotropy in the Earth is usually a scale effect, created by averaging over structures with a preferred orientation. Homogenization theory applied to typical geological structures can help to determine the range of values to be expected in electrically anisotropic formations. The staggered-grid finite-difference method for Maxwell’s equations can easily accommodate anisotropic regions, without a significant increase in computational load. A simple magnetotelluric model shows that, in elongated anisotropic structures, the tipper is no longer perpendicular to the strike direction; thus, the electric and magnetic polarizations are mixed.

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Figures & Tables


Geophysical Developments Series

Three-Dimensional Electromagnetics

Society of Exploration Geophysicists
ISBN electronic:
Publication date:
January 01, 1999




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