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Strike-Slip Faulting

Geol341-342

2004Many diagrams are from Earth Structure, van der Pluijm and Marshak, 2004

Outline

• Tectonic setting

 – Transform plate boundaries

 – Escape structures in the hinterland of plate collisionzones

 – Transfer zones in thrust belts or normal fault systems

• -Development of a strike slip fault

• -Strain within a strike slip shear zone –en echelonstructures

• -Releasing bends and restraining bends

Plate MotionsTransform Plate Boundaries Transform:

Link between other kind of plate boundaries

San

Andreas

System

Evolution of the Plate Boundary

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Oceanic TransformsAge of the Ocean Floor map

Oceanic Transform Fault

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Intraplate Deformation: Continental Collisions

Lateral Escape

Transfer zones in Thrust and 

Extensional Systems

Lateral Ramps in the

Appalachians

Link between Two segments of a

rift

Bends in Strike-slip Faults

Releasing bend 

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Bends in Strike-slip Faults

Restraining bend Flower Structures

Positive Flower StructureArdmore Basin, Oklahoma

Transverse Ranges-San Andreas Fault

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Development of a Strike-slip fault

Clay cake

experiments

(Wilcox, Hardy and Seely, 1973)

En Echelon Fractures

Large strike-slip faults start as a set of shorter fractures arranged 

 En Echelon.

En Echelon Fractures

Strain Pattern in a Shear Zone

Tilt of the

strain ellipse

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Orientation of Folds and Thrusts

Right-lateral Strike-slipOrientation of Normal faults and 

Veins

Right-lateral Strike-slip