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"Analyzing Bay Area Faults: Earthquake Interactions Before and After 1906"

This study investigates seismic activity in the Bay Area over a 150-year period, divided into 75 years before and after the 1906 earthquake. It examines the region's network of roughly parallel faults and the concept of stress shadows. Notable historical events, including the 1992 M=7.3 Landers shock, and subsequent earthquakes such as the M=6.5 Big Bear shock, are analyzed to understand how stress transfer influences seismic events. The research emphasizes the complexity of earthquake interactions and the implications for future seismic risk assessment.

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"Analyzing Bay Area Faults: Earthquake Interactions Before and After 1906"

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  1. from Parsons et al (2001)

  2. Parsons et al (2001)

  3. Bay area shocks during the 75 years before 1906

  4. Bay area shocks during the 75 years after 1906

  5. Bay area is a system of roughly parallel faults

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

  7. 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)

  8. 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)

  9. …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)

  10. Earthquakes converse through the transfer of stress

  11. Shinji Toda

  12. Tom Parsons Tom Parsons

  13. Aykut Barka 1952-2002

  14. Jian Lin

  15. Jim Dieterich

  16. Now what? å

  17. But can one explain the time decay?

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