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Kevin P Furlong Geodynamics Research Group, Geosciences, Penn State University

Kevin P Furlong Geodynamics Research Group, Geosciences, Penn State University. Why is the San Andreas Fault System so Creepy?. The Hayward Fault - Creeping + Earthquakes!. Questions: What controls which fault segments exhibit creep? Why do fault segments creep at different rates?

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Kevin P Furlong Geodynamics Research Group, Geosciences, Penn State University

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  1. Kevin P Furlong Geodynamics Research Group, Geosciences, Penn State University Why is the San Andreas Fault System so Creepy?

  2. The Hayward Fault - Creeping + Earthquakes!

  3. Questions: What controls which fault segments exhibit creep? Why do fault segments creep at different rates? Do young fault segments creep? How young?

  4. Why Do Some Segments Creep? Data from Galehouse et al.

  5. Is it the Geology?

  6. - 3-D Viscoelastic Model - Fault in ‘elastic’ layer allowed to slip - Patches on fault can be locked - System driven by ‘far field’ displacement

  7. Effects of Locking Depth, Lithospheric Shear Zones, and Fault Length

  8. BASIX Plate Boundary centered beneath the East Bay Fault System Pacific Plate (mechanical) extends beneath S.F. Bay

  9. Lisowski and Prescott, BSSA 1981 Decrease in San Andreas Creep is transferred to southern Calaveras ~ 20 mm/yr

  10. Lithospheric Structure

  11. Creeping Faults follow along one major strand of plate boundary system

  12. Effect of a Crustal Triple Junction

  13. MODELING FAULT CREEP, LOCKED PATCHES, AND PATTERNS OF SEISMICITY

  14. Initiation of Fault Creep

  15. Summary Lithospheric plate boundary corridor constrains distribution of creeping faults Full-rate creeping segment marked by passage of the Hollister “crustal triple junction” Plate boundary localization well developed in ~ 2 Ma (Ma’acama Fault @ Willits)

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