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Bulletin of the Seismological Society of America; April 2005; v. 95; no. 2; p. 390-400; DOI: 10.1785/0120040103
© 2005 Seismological Society of America
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Ambiguity of the Moment Tensor

Jean-Paul Ampuero*,1 and F. A. Dahlen1

1 Department of Geosciences
Princeton University
Princeton, New Jersey 08544
 (J.-P.A.)

Correspondence: * Present address: Institute of Geophysics, Seismology, and Geodynamics, ETH Hönggerberg (HPP), CH-8093 Zürich, Switzerland; ampuero{at}erdw.ethz.ch.

An earthquake on a fault separating two dissimilar materials does not have a well-defined moment density tensor. We present a complete characterization of this bimaterial ambiguity in the general case of slip on a fault in an anisotropic medium. The ambiguity can be eliminated by utilizing a potency density rather than a moment density representation of a bimaterial source.






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