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USGS CMG InfoBank: Dip Slip Fault Types

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Comment: 11:36 - 12:38 (01:02)
Source: Annenberg/CPB Resources - Earth Revealed - 8. Earth's Structures
Keywords: "tectonic activity", "Scott Paterson", fracture, fault, "dip-slip fault", "reverse fault", "normal fault", "thrust fault", "detachment fault", earthquake, deformation

Our transcription: In the case of steeply inclined dip slip faulting, there are two main types.
We can have what we call "reverse faults" where the upper block above the fault's surface is moving up relative to the lower block like this.
The other possibility, obviously, is that we can take this upper block and move it down, and that is what we would call a "normal fault".
We can also, if we take that third orientation where I rotate my fault surface to a horizontal direction, or often they're not perfectly horizontal, but the dip is very low, we can have again what we call "thrust faults".
If my upper block is moving up with respect to the lower block, and if we move it in the other direction to the upper block is moving down the dip of my low angle surface, we can have low angle "detachment faults".
In each case, we are changing the shape of the rock in a different way depending on again the orientation of the fault surface and the direction of displacement.

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