Geology 3120 introduction to strike slip faults
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Geology 3120 - Introduction to Strike-Slip Faults. Levant Strike-Slip Faults. Outline. Stick-Slip and Creep Andersonian Theory Kinematics Strike-Slip Faults on Continental Margins Strike-Slip Faults on Mid-Ocean Ridges. Stick-Slip: Elastic Rebound Theory. D. Elastic Rebound Theory.

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Geology 3120 introduction to strike slip faults
Geology 3120 - Introduction to Strike-Slip Faults



Outline

  • Stick-Slip and Creep

  • Andersonian Theory

  • Kinematics

  • Strike-Slip Faults on Continental Margins

  • Strike-Slip Faults on Mid-Ocean Ridges



Elastic Rebound Theory

  • Imagine a fence across an active fault


Elastic Rebound Theory

  • Imagine a fence across an active fault

  • Regional deformation occurs but the fault does not break. The fence becomes curved.


Elastic Rebound Theory

  • Imagine a fence across an active fault

  • Regional deformation occurs but the fault does not break.

  • Once the fault breaks, the fence is sheared in half and marks offset

  • Note that far-field strain may limit whether the fault accommodates all the plate motion at its trace




Creep (Aseismic Slip)

  • Imagine a fence across an active fault

  • Slip occurs slowly on the fault continually over time.

  • Creeping faults do not store elastic energy that might be released by a stick-slip event (an earthquake)







Arrow Heads ( ) and Tails ( )

Block moving toward you like an arrowhead heading towards you

Block moving away from you like seeing the feathers of an arrow


Arrow Heads ( ) and Tails ( )

Right-lateral or left-lateral?



Arrow Heads ( ) and Tails ( )

Sinistral or Dextral?




Strike-Slip Faulting: EQ’s = dislocations

See http://www.data.scec.org/Module/links/landrupt.html

Landers rupture propagation movies


Strike-Slip Faults on Continental Margins

50 m

N

What is the sense of slip?


Strike-Slip Faults on Continental Margins

50 m

N

Right-lateral (dextral)















Strike-Slip Faults on Mid-Ocean Ridges

What is the sense of slip?



Pacific-Antarctic Ridge

Magnetic anomalies from present to 9.9 Ma

Warm colors indicate positive polarity

Cool colors indicate reverse polarity


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