Strike-slip deformation with erosion and cross sections

 

In this model we show how different subsequent types of faults form in relationship to a strike-slip fault like the San Andreas fault.

Images: geology.com and wikipedia.org

First to form are Riedel faults (R faults). The first set forms at ~15 degree angles to the main strike-slip fault. In the video these faults break up the main anticline into smaller anticlines. The second set of faults (R’ – not shown explicitly in the video) form at ~75 degree angles and link the R faults together.

1280px-Riedel

Image: wikipedia.org

If you examine the R faults in cross-section you see they are made up of lots of smaller little faults that either have a normal or reverse sense of motion. If the smaller faults are normal then they form “negative” flower structures, but if they’re reverse they form “positive” flower structures.

Flowerstructure1

image: wikipedia.org
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