Geology 3120 introduction to strike slip faults
This presentation is the property of its rightful owner.
Sponsored Links
1 / 42

Geology 3120 - Introduction to Strike-Slip Faults PowerPoint PPT Presentation


  • 109 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

Geology 3120 - Introduction to Strike-Slip Faults

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Geology 3120 introduction to strike slip faults

Geology 3120 - Introduction to Strike-Slip Faults


Geology 3120 introduction to strike slip faults

Levant 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

Stick-Slip: Elastic Rebound Theory

D


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

Elastic Rebound Theory


Geology 3120 introduction to strike slip faults

Elastic Rebound Theory


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

Andersonian Theory


Geology 3120 introduction to strike slip faults

Conjugate Strike-Slip Faults


Geology 3120 introduction to strike slip faults

Determining Sense of Slip


Geology 3120 introduction to strike slip faults

Right-Lateral (Dextral)


Geology 3120 introduction to strike slip faults

Left-Lateral (Sinistral)


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 ( )

Left-lateral


Geology 3120 introduction to strike slip faults

Arrow Heads ( ) and Tails ( )

Sinistral or Dextral?


Geology 3120 introduction to strike slip faults

Arrow Heads ( ) and Tails ( )

Dextral


Geology 3120 introduction to strike slip faults

Strike-Slip Faulting: Shallow Brittle vs Deep Shear


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

Transtension


Geology 3120 introduction to strike slip faults

Development of a Pull-Apart Basin


Geology 3120 introduction to strike slip faults

Pull-Apart Basin


Geology 3120 introduction to strike slip faults

Initial Releasing Bend


Geology 3120 introduction to strike slip faults

Evolution of a Releasing Bend


Geology 3120 introduction to strike slip faults

Normal (-) Flower Structure - Tulip


Geology 3120 introduction to strike slip faults

Transpression


Geology 3120 introduction to strike slip faults

Development of a Restraining Bend


Geology 3120 introduction to strike slip faults

Initial Restraining Bend


Geology 3120 introduction to strike slip faults

Evolution of a Restraining Bend


Geology 3120 introduction to strike slip faults

Reverse (+) Flower Structure - Palm


Geology 3120 introduction to strike slip faults

Summary of Flower Structures - Palms & Tulips


Geology 3120 introduction to strike slip faults

Oceanic Strike Slip fault: Transforms


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

Strike-Slip Faults on Mid-Ocean Ridges

Right-lateral (Dextral)


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


  • Login