Stress drop and frictional heating during the 1994 deep Bolivia earthquake

Details Stress drop and frictional heating during the 1994 deep Bolivia earthquake Stress drop and frictional heating during the 1994 deep Bolivia earthquake

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3521b&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 23, p. 3521-3524

Physics

4

Seismology: Earthquake Dynamics And Mechanics, Tectonophysics: Heat Generation And Transport, Tectonophysics: Stresses-Crust And Lithosphere

Scientific paper

We use the slip model of the Bolivian earthquake obtained by Ihmlé [1998] to investigate the spatial distribution of stress drop and calculate the frictional heat generated locally on the fault. We find that the stress drop associated with the earthquake averages between 5 and 10 M Pa over the fault. The total frictional energy is estimated at between 3×1017 and 2×1018J. If the fault width is as thin as the one produced by transformational faulting in laboratory experiments, where it is about two orders of magnitude smaller than the local shear displacement, melting likely occurred on a significant portion of the fault. In this event, as proposed by Kanamori et al. [1998], once rupture is triggered, shear melting can quickly promote extensive slip.

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