EPSC 201 Lecture Notes - Lecture 19: Continental Crust, Oceanic Crust, Subduction
11 Mar 2013
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Document Summary
Dip-slip faults faults that are being compressed or extended at a fault. A normal fault has extension of the two plates forming the fault, which causes horsts and graben to form, and for some of the plate to move downward. Reverse dip-slip faults are a result of compression, and can cause on side of the fault to go upwards, to accommodate the compression. If there are two dip-slip faults present, horsts and graben can form. The graben is like a valley, with lots of scraping along the edges. A horst is formed when the two outlying plates are extended and move downwards, leaving the middle landmass at the original height, now above the outlying plates. Strike-slip faults occur when the force is 90 degrees to the fault. All of the movement is in the horizontal plane, and can be measured relative to true north.
