General Observations on Segmentation From the San Jacinto and Elsinore Faults, and Faults of the Eas

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General Observations on Segmentation From the San
Jacinto and Elsinore Faults, and Faults of the
Eastern California Shear Zone

• Tom Rockwell, SDSU

WGCEP Workshop on Fault Segmentation, March
15-17, 2006
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Main Considerations

• Why segment faults? In other words, what is the
  basis of segmenting a fault?
• Perceived structural boundaries
• Disparate paleoseismic histories
• Occurrence of historical ruptures
• Personal bias

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Holocene Lake Cahuilla in the Salton
Trough of southern California
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Paleoseismic sites and the 1968 rupture
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Paleoseismic sites and the 1968 rupture
2 km releasing step-over
South end of 1968 slip (all Afterslip on South
break)
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Displaced channel
RL 22 mm
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• Several Major Earthquakes This Century!
• 1947 M6.3 Manix Lake
• 1975 M5.9 Galway Lake
• 1979 M5.9 Homestead Valley
• 1992 M6.2 Joshua Tree
• 1992 M7.3 Landers
• 1999 M7.1 Hector Mine
• What are the long-term patterns of strain release?

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