Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..115..181w&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 115, Issue 3-4, p. 181-190.
Physics
5
Scientific paper
The energy radiated as waves is a parameter vital to the understanding of earthquake rupture physics. Calculations of this energy, however, are difficult and wrought with uncertainty. We developed a new hybrid method for the calculation of radiated wave energy and other key seismic parameters. The method calculates these parameters in an internally consistent and objective manner, allowing for robust comparison between parameters and across earthquakes. In addition, the method does not require deconvolution or filtering of data, thus results contain all recorded high frequencies. We use the method to calculate source-time functions, seismic moment, duration, and radiated wave energy for 19 recent, deep (depth>292 km) earthquakes ranging in size from Mw=6.5 to 8.2. We compute effective seismic efficiency for the three largest events. The principle result is that the effective seismic efficiencies are less than 0.3. If earthquake rupture adhered to the Orowan model, then the average frictional stress during rupture is equal to the final shear stress on the fault plane, and the seismic efficiency is 1. But since the measured seismic efficiency is less than 1, the rupture process of these large deep earthquakes partitions more energy into friction and the average frictional stress during rupture is higher than the final fault plane stress.
Ruff Larry J.
Winslow N. W.
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