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Failure of self-similarity for large (M > ) earthquakes

U.S. GEOLOGICAL SURVEY SEISMOLOGY BRANCH CALIFORNIA INSTITUTE OF TECHNOLOGY, 525-21, PASADENA, CALIFORNIA 91125

Abstract

We compare teleseismic P-wave records for earthquakes in the magnitude range from 6.0 to 9.5 with synthetics for a self-similar, ² source model and conclude that the energy radiated by very large earthquakes (M_w > ) is not self-similar to that radiated from smaller earthquakes (M_w < ). Furthermore, in the period band from 2 sec to several tens of seconds, we conclude that large subduction earthquakes have an average spectral decay rate of ^-1.5. This spectral decay rate is consistent with a previously noted tendency of the ² model to overestimate M_s for large earthquakes.

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