thrust fault
Definition
Noun: A thrust fault is a type of geological fault where one block of rock, the hanging wall, moves up and over an adjacent block, the footwall. This movement is caused by compressional forces in the Earth's crust, making the rock layers on the upper side appear to have been pushed upward relative to the layers below.
Usage and Examples
- Noun:
- The mountain range was formed by a major thrust fault.
- Geologists identified a thrust fault responsible for the earthquake.
- In a thrust fault, older rocks are often found on top of younger ones.
Advanced Usage
- "Blind thrust fault": A thrust fault that does not extend to the Earth's surface.
- The seismic activity was caused by a blind thrust fault hidden deep underground.
Variants and Related Words
- Thrust (n): In geology, the specific movement or force associated with thrust faulting.
- The thrust created a series of folded hills.
- Reverse fault (n): A general category of dip-slip faults caused by compression, of which a thrust fault is a specific type with a low-angle fault plane.
- Overthrust (n): A thrust fault with a large displacement, often over many kilometers.
Synonyms
- Overthrust fault: Often used interchangeably with thrust fault, especially for large-scale features.
- Compressional fault: A broader term for faults caused by compressional forces.
Related Terms and Phrases
- Fault plane: The surface along which the movement of a thrust fault occurs.
- Hanging wall: The block of rock that lies above the fault plane in a thrust fault.
- Footwall: The block of rock that lies below the fault plane in a thrust fault.
Noun
-
a geological fault in which the upper side appears to have been pushed upward by compression
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