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Types of Faults – Right Lateral Strike Slip

Learn about different types of faults like strike-slip, normal, reverse, and buried faults. Explore how to estimate fault activity and earthquake recurrence intervals through paleoseismology and landforms.

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Types of Faults – Right Lateral Strike Slip

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  1. Types of Faults – Right Lateral Strike Slip San Andreas Fault- right lateral

  2. Types of Faults – Normal Fault (Dip-Slip)

  3. Types of Faults – Reverse Fault (Dip-Slip) Low angle reverse fault (if fault plane dips less than 45˚) = “Thrust Fault”

  4. Other Types of Faults – Buried Faults a.k.a. “Blind Thrusts”, may produce folds

  5. Fault Activity A fault is considered to be “active” if it has witnessed slip within the last 10 kyrs (within the Holocene)

  6. Prehistoric Fault Activity – How do we know? Paleoseismology We can examine geomorphic markers in the landscape.

  7. Trenching Example Radiocarbon dating of faulted sediments exposed in Coyote Creek Trench Vertical component of fault motion is used to calculate earthquake recurrence interval.

  8. Fault Related Landforms – Estimating Fault Activity

  9. Santa Cruz Marine Terraces

  10. Modern Sea Cliffs

  11. Wave Energy

  12. Marine Terrace Profiles Figure from Rosenbloom and Anderson, JGR, 1994

  13. Loma Prieta Event - 1989 http://en.wikipedia.org/wiki/Image:Car_Crushed_Under_Marina_Apartments.jpg

  14. Loma Prieta Event - 1989 Figure from Anderson, 1990 (Science) Adams, SFSU in-class lecture - 3/7/2007

  15. Coseismic Uplift - Alaska Coast http://geology.uprm.edu/Morelock/eustatic.htm Adams, SFSU in-class lecture - 3/7/2007

  16. Coseismic Surface Uplift(Good Friday Earthquake) From Keller and Pinter, Active Tectonics (2nd ed.), 2002 Adams, SFSU in-class lecture - 3/7/2007

  17. Restraining Bend - Transpression Figure from Anderson, 1990 (Science) Adams, SFSU in-class lecture - 3/7/2007

  18. The “Mountain Factory” Image courtesy of USGS / PG&E Cooperative Research Adams, SFSU in-class lecture - 3/7/2007

  19. Warped Terrace Treads Figure from Anderson, 1990 (Science) Adams, SFSU in-class lecture - 3/7/2007

  20. Terrace Ages / Uplift Calculation uplift rate = 1.1 mm/yr Figure from Perg et al., 2001 (Geology) Adams, SFSU in-class lecture - 3/7/2007

  21. Recurrence Interval Calculation *Uplift rate = 1.1 mm/yr = 1.1 m/kyr *How old and high are the features? Terrace 2 = ~ 85 kyr old and 85 meters above SL *How much uplift per Loma Prieta-type event? ~ 1 meter / event *How frequent are these events? (85 kyr / 85 meters) * (1 meter / event) = 1 event every 1000 years

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