Static stress changes-- Coulomb. Key concepts: Source faults Receiver faults Optimally oriented faults Assume receiver faults are close to failure Triggering.

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Presentation transcript:

Static stress changes-- Coulomb

Key concepts: Source faults Receiver faults Optimally oriented faults Assume receiver faults are close to failure Triggering lag time is a problem

Coulomb failure

Change of coulomb stress on faults of specified orientation Can change spatially Remote: Induced: Total: Can change spatially

From King et al (BSSA, 1994)

Change of coulomb stress on faults of optimal orientation

from Todal et al (JGR, 2005)

Stress changes are permanent but seismicity is not from Todal et al (JGR, 2005)

1992 M=7.3 Landers shock increases stress at Big Bear Los Angeles Big Bear Landers First 3 hr of Landers aftershocks plotted from Stein (Nature, 2003)

1992 M=7.3 Landers shock promotes the M=6.5 Big Bear shock 3 hr later Los Angeles Big Bear Landers First 3 hr of Landers aftershocks plotted from Stein (Nature, 2003)

…and promotes the M=7.1 Hector Mine shock 7 yr later Los Angeles Hector Mine First 7 yr of aftershocks plotted from Stein (Nature, 2003)

Bay area shocks during the 75 years before 1906 from Stein (Nature, 2003)

Bay area shocks during the 75 years after 1906 from Stein (Nature, 2003)

Bay area is a system of roughly parallel faults

from Harris & Simpson (1998) and Parsons (2003) Bay area faults may have fallen under a stress shadow in 1906

from Lin & Stein (JGR, 2004)