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Stress drops and radiated energies of aftershocks of the 1994 Northridge, California, earthquake
 

Summary: Stress drops and radiated energies of aftershocks of the 1994
Northridge, California, earthquake
Jim Mori
Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto, Japan
Rachel E. Abercrombie
Department of Earth and Planetary Sciences, Boston University, Boston, Massachusetts, USA
Hiroo Kanamori
Seismological Laboratory, California Institute of Technology, Pasadena, California, USA
Received 1 December 2000; revised 11 May 2003; accepted 25 June 2003; published 28 November 2003.
[1] We study stress levels and radiated energy to infer the rupture characteristics and
scaling relationships of aftershocks and other southern California earthquakes. We use
empirical Green functions to obtain source time functions for 47 of the larger (M ! 4.0)
aftershocks of the 1994 Northridge, California earthquake (M6.7). We estimate static and
dynamic stress drops from the source time functions and compare them to well-calibrated
estimates of the radiated energy. Our measurements of radiated energy are relatively
lowcompared to the static stress drops, indicating that the static and dynamic stress drops
are of similar magnitude. This is confirmed by our direct estimates of the dynamic stress
drops. Combining our results for the Northridge aftershocks with data from other southern
California earthquakes appears to show an increase in the ratio of radiated energy to
moment, with increasing moment. There is no corresponding increase in the static stress

  

Source: Abercrombie, Rachel E. - Department of Earth Sciences, Boston University

 

Collections: Geosciences