Focal mechanism dependence of static stress triggering of earthquakes

We perform a global statistical investigation into the problem of Coulomb stress triggering of earthquakes by using the Harvard CMT catalogue of shallow earthquakes from 1976 to 2001. We consider ‘earthquake pairs’, i.e., pairs of successive earthquakes occurring near each other with similar focal m...

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Bibliographic Details
Published in:Tectonophysics 2004-10, Vol.390 (1), p.235-243
Main Authors: Wan, Y.G., Wu, Z.L., Zhou, G.W.
Format: Article
Language:English
Subjects:
Coulomb failure stress
Focal mechanism
Static stress triggering
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Summary:We perform a global statistical investigation into the problem of Coulomb stress triggering of earthquakes by using the Harvard CMT catalogue of shallow earthquakes from 1976 to 2001. We consider ‘earthquake pairs’, i.e., pairs of successive earthquakes occurring near each other with similar focal mechanisms, and address the problem of whether or not the change of the Coulomb failure stress (CFS) produced by the first earthquake of the pair ‘encourages’ the occurrence of the second one. An interesting feature is that such a Coulomb stress-triggering phenomenon has an apparent focal mechanism dependence: for thrust earthquakes, a more evident triggering effect can be observed.
ISSN:0040-1951
1879-3266
DOI:10.1016/j.tecto.2004.03.028