Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; April 1996; v. 86; no. 2; p. 299-305
© 1996 Seismological Society of America
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The triggering of aftershocks by the free oscillations of the earth

Kamal and L. Mansinha

Department of Earth Sciences University of Western Ontario, London, Ontario N6A 5B7, Canada

Abstract

Analysis of the Loma Prieta aftershock sequence (mainshock: 18 October 1989) shows periodicities at the periods of two normal modes 0S2 and 0T2. About 10% of the small aftershocks in the fault zone are triggered by these two modes during the 6 days following the mainshock.






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