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Static stress changes--Coulomb

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:

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Static stress changes--Coulomb

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  1. Static stress changes--Coulomb

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

  3. Coulomb failure

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

  5. From King et al (BSSA, 1994)

  6. From King et al (BSSA, 1994)

  7. From King et al (BSSA, 1994)

  8. Change of coulomb stress on faults of optimal orientation

  9. from Todal et al (JGR, 2005)

  10. from Todal et al (JGR, 2005)

  11. from Todal et al (JGR, 2005)

  12. from Todal et al (JGR, 2005)

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

  14. 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 (Nature, 2003)

  15. 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 (Nature, 2003)

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

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

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

  19. Bay area is a system of roughly parallel faults

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

  21. from Lin & Stein (JGR, 2004)

  22. from Lin & Stein (JGR, 2004)

  23. from Lin & Stein (JGR, 2004)

  24. from Lin & Stein (JGR, 2004)

  25. from Lin & Stein (JGR, 2004)

  26. from Lin & Stein (JGR, 2004)

  27. from Lin & Stein (JGR, 2004)

  28. from Lin & Stein (JGR, 2004)

  29. http://quake.usgs.gov/research/deformation/modeling/animations/index.htmlhttp://quake.usgs.gov/research/deformation/modeling/animations/index.html

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