[SIO GP Seminars] Mike Oskin, UNC, 2 PM Today

[Daniel Brothers]

On Mar 14, 2007, at 6:28 PM, Daniel Brothers wrote:

> Please join us for a special GP seminar this Thursday.
>
>
>
> ==================================
>
> Thursday, March 15, 2:15 PM
> (refreshments served at 2:00 PM)
> Munk Conference Room
>
> Mike Oskin
> University of North Carolina at Chapel Hill
>
> "Fault system behavior of the Eastern California shear zone:  
> Unsteady loading rates and clustered earthquake activity"
>
> ==================================
>
>
>
>
>
> Abstract:
> Clustering of major earthquakes over periods of years to decades is
> observed historically and in paleoseismic records. Seismic hazard
> forecasts may be improved by identifying a cluster in-progress and
> its relationship to fault loading processes. I present new long-term
> fault slip-rates from the Eastern California shear zone (ECSZ), where
> both paleoseismic and historic earthquake clusters are recognized, to
> test if the interseismic loading rate is transiently elevated during
> the present cluster of activity.  The sum of six fault slip rates
> that average a few to several tens of earthquakes is 5.9±1.4 mm/yr.
> This long-term rate is only half the present-day loading rate of 12±2
> mm/yr across the 60 km-wide shear-zone. This discrepancy began prior
> to the 1992 Mw 7.3 Landers earthquake, and its magnitude precludes
> residual post-seismic deformation following other large historic
> earthquakes in southern California. These observations support that
> significantly elevated regional strain accumulation rate may be
> characteristic of clustered earthquake activity, and that
> interseismic loading may oscillate between different fault sets
> within a hierarchal fault system.
>
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