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Book Chapter

A New Algorithm for 3-D Nonlinear Electromagnetic Inversion

By
Ganquan Xie
Ganquan Xie
Earth Sciences Division, Bldg. 90, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA.
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Jianhua Li
Jianhua Li
Earth Sciences Division, Bldg. 90, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA.
Search for other works by this author on:
Published:
January 01, 1999

Summary

We propose a new algorithm for 3-D electromagnetic inversion that works with the magnetic-field integral equation (instead of the traditional electric-field integral equation). The forward and inverse integral equations are discretized by the finite element method; solution of the matrix system involves alternating conjugate-gradient and biconjugate-gradient iterations. The solution is regularized by a novel external annealing technique. A coupled-domain decomposition allows a very efficient (96%) implementation of the algorithm on massively parallel machines. Tests on both synthetic and field data from environmental sites yield good subsurface images in a reasonable amount of computational time.

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Contents

Geophysical Developments Series

Three-Dimensional Electromagnetics

Society of Exploration Geophysicists
Volume
7
ISBN electronic:
9781560802154
Publication date:
January 01, 1999

GeoRef

References

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