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from Parsons et al (2001). Parsons et al (2001). Bay area shocks during the 75 years before 1906. Bay area shocks during the 75 years after 1906. Bay area is a system of roughly parallel faults. Bay area faults may have fallen under a stress shadow in 1906. from

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from Parsons et al (2001)


Parsons et al (2001)


Bay area shocks during the 75 years before 1906


Bay area shocks during the 75 years after 1906


Bay area is

a system of

roughly

parallel

faults


Bay area faults

may have

fallen under

a stress shadow

in 1906

from

Harris & Simpson

(1998) and Parsons

(2003)


1992 M=7.3 Landers shock

increases stress

at Big Bear

Landers

Big

Bear

Los

Angeles

First 3 hr of Landers

aftershocks

plotted

from

Stein (2003)


1992 M=7.3 Landers shock

promotes the M=6.5 Big

Bear shock 3 hr later

Landers

Big

Bear

Los

Angeles

First 3 hr of Landers

aftershocks

plotted

from

Stein (2003)


…and promotes the

M=7.1 Hector Mine

shock 7 yr later

Hector Mine

Los

Angeles

First 7 yr of

aftershocks

plotted

from

Stein (2003)


Earthquakes converse through the transfer of stress


Shinji Toda


Tom Parsons

Tom Parsons


Aykut Barka

1952-2002


Jian Lin


Jim Dieterich


Now what?

å


But can one

explain the

time decay?


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