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Fault Types

Two graphics showing reverse/thrust faulting, and strike-slip faulting.

The three principal fault types are strike-slip, reverse, and normal (see fig. 5). Movement occurs along a fault plane. Footwalls are below the fault plane, and hanging walls are above. In a normal fault (see fig. 5), crustal extension (pulling apart) moves the hanging wall down relative to the footwall. Faults mapped in the vicinity of the monument are normal faults. In a reverse fault, crustal compression (squeezing together) moves the hanging wall up relative to the footwall. A thrust fault is a type of reverse fault that has a dip angle of less than 45°. In a strike-slip fault, movement is horizontal. When movement across a strike-slip fault is to the right, it is a right-lateral strike-slip fault, as illustrated above. When movement is to the left, it is a left-lateral strike-slip fault.

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Graphic by Trista Thornberry-Ehrlich (Colorado State University).

Public domain:Full Granting Rights

Image

Casa Grande Ruins National Monument, Code: CAGR

Casa Grande Ruins National Monument, Pinal County, Arizona
Latitude: 32.996898651123, Longitude: -111.532997131348

NPS.gov Collection

01/01/0001

Public Can View

Wednesday, July 21, 2021 2:08:09 PM

Wednesday, July 21, 2021 2:41:57 PM

Figure_6_fault types 1 column TTE-01.jpg

Monday, January 1, 0001 12:00:00 AM

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Scenic