Horsts and Grabens


horst and graben
A HORST is an elongated block bounded by parallel (normal, reverse, lateral) faults in such a way that it stands (above, below) the blocks on both sides. A GRABEN is a narrow block moved (upward, downward) between two (normal, reverse, lateral) faults.
A special type of vertical fault is a thrust or overthrust fault. This is a reverse fault that has a fault plane that has a very low angle. Notice that this results in one of the exceptions to the law of superposition.
thrust fault


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