Subevent structure of large earthquakes-A ground-motion perspective

Details Subevent structure of large earthquakes-A ground-motion perspective Subevent structure of large earthquakes-A ground-motion perspective

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28...53b&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 1, p. 53-56

Physics

5

Seismology: Earthquake Dynamics And Mechanics, Seismology: Earthquake Ground Motions And Engineering, Seismology: Earthquake Parameters, Seismology: Seismic Hazard Assessment And Prediction

Scientific paper

Our ability to predict ground motions from future earthquakes hinges on the accurate modeling of the radiation from the earthquake source. A successful approach to modeling earthquake radiation has been to represent faults as a series of discrete, independently-rupturing subfaults, although their physical interpretation has remained largely unclear. Our simulation of ground motions from twenty-six well-recorded moderate-to-large earthquakes substantiates the hypothesis that large ruptures are made up of a sequence of smaller subevents. The size of a subevent follows a simple linear relationship with the size of the earthquake fault in an apparently deterministic manner. The strength of the high-frequency radiation is controlled by the maximum slip velocity, which varies stochastically over a small range. Both the characteristic subevent size and the slip velocity appear to be region-independent, indicating a remarkable uniformity in earthquake source properties. This observation helps to reduce the uncertainty in ground-motion prediction by constraining its essential and previously ambiguous parameters.

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