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

Geophysical Research Letters

By:
and
DOI: 10.1029/2001GL013094

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Abstract

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 farfield. 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 0.6?? to 0.95??, where ?? is the shear wave speed. The revised equation for apparent stress for subfault ij is taij = f(VR) ????/ 2 Dij??? D(t)ij2dt, where ?? is density, D(t)ij is the time-dependent slip, and Dij is the final slip. The corresponding seismic energy is Eaij = ADijtaij, 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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A method for mapping apparent stress and energy radiation applied to the 1994 Northridge earthquake fault zone-revisited
Series title:
Geophysical Research Letters
DOI:
10.1029/2001GL013094
Volume
28
Issue:
18
Year Published:
2001
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
3529
Last page:
3532