A method for mapping apparent stress and energy radiation applied to the 1994 Northridge earthquake fault zone-revisited

Details A method for mapping apparent stress and energy radiation applied to the 1994 Northridge earthquake fault zone-revisited A method for mapping apparent stress and energy radiation applied to the 1994 Northridge earthquake fault zone-revisited

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3529m&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 18, p. 3529-3532

Physics

3

Seismology: Earthquake Dynamics And Mechanics, Seismology: Earthquake Parameters

Scientific paper

McGarr and Fletcher (2000) introduced a technique for estimating apparent stress and seismic energy radiation associated with small patches of a larger fault plane and then applied this method to the slip model of the Northridge earthquake (Wald et al., 1996). These results must be revised because we did not take account of the difference between the seismic energy near the fault and that in the far-field. The fraction f(vR) of the near-field energy that propagates into the far-field is a monotonic function that ranges from 0.11 to 0.40 as rupture velocity vR increases from 0.6β to 0.95β, where β is the shear wave speed. The revised equation for apparent stress for subfault ij is τaij=f(vR)/2ρβ/Dij∫Ddot(t)ij2dt, where ρ is density, D(t)ij is the time-dependent slip, and Dij is the final slip. The corresponding seismic energy is Eaij=ADijτaij, where A is the subfault area. Our corrected distributions of apparent stress and radiated energy over the Northridge earthquake fault zone are about 35% of those published before.

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