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Bulletin of the Seismological Society of America; June 1995; v. 85; no. 3; p. 808-813
© 1995 Seismological Society of America
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Earthquake "Quanta" as an explanation for observed magnitudes and stress drops

I. Selwyn Sacks and Paul A. Rydelek

Department of Terrestrial Magnetism Carnegie Institution of Washington, Washington, D.C. 20015
Center for Earthquake Research and Information The University of Memphis, Memphis, Tennessee, 38152

Abstract

The familiar linear relation (Gutenberg-Richter) between the logarithm of the number of earthquakes and their magnitude is commonly ascribed to the distribution (fractal) of fault sizes in a self-similar process. We show that a concept of earthquake quanta whose failure is governed by simple physics and suggested by observations explains not only the Gutenberg-Richter relation but also the relatively constant stress drop for larger magnitude events. Results from computer simulation are consistent with observations from detailed seismicity studies.




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