Faults are formed due to the combined effect of both the compressional and tensional forces, but a tensional force played a significant role in it. Faults allow the blocks to move relative to each other. Exclusive stress and strains produce fracturing and are usually accompanied by dislocation. Such relatively rapid movement produces crustal blocks (Horsts) and rift valleys or depressions (Graben).
- Horsts and Graben are found in association with one another. The plane along which the rocks are displaced is called the fault plane.
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