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



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



Geology 3120 introduction to strike slip faults

Elastic Rebound Theory

  • Imagine a fence across an active fault


Geology 3120 introduction to strike slip faults

Elastic Rebound Theory

  • Imagine a fence across an active fault

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


Geology 3120 introduction to strike slip faults

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




Geology 3120 introduction to strike slip faults

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)







Geology 3120 introduction to strike slip faults

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


Geology 3120 introduction to strike slip faults

Arrow Heads ( ) and Tails ( )

Right-lateral or left-lateral?



Geology 3120 introduction to strike slip faults

Arrow Heads ( ) and Tails ( )

Sinistral or Dextral?




Geology 3120 introduction to strike slip faults

Strike-Slip Faulting: EQ’s = dislocations

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

Landers rupture propagation movies


Geology 3120 introduction to strike slip faults

Strike-Slip Faults on Continental Margins

50 m

N

What is the sense of slip?


Geology 3120 introduction to strike slip faults

Strike-Slip Faults on Continental Margins

50 m

N

Right-lateral (dextral)















Geology 3120 introduction to strike slip faults

Strike-Slip Faults on Mid-Ocean Ridges

What is the sense of slip?



Geology 3120 introduction to strike slip faults

Pacific-Antarctic Ridge

Magnetic anomalies from present to 9.9 Ma

Warm colors indicate positive polarity

Cool colors indicate reverse polarity