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A reverse fault is a fault along which the rocks in the hanging wall appear to have moved upward relative to those in the footwall. In certain combinations of dipping strata and horizontal component of displacement, the hanging wall may appear to have moved upward, even though the actual vertical component of movement of the hanging wall was down relative to the footwall. Thrust faults are technically reverse faults, but because they are demonstrably the result of compression and the relative upward movement of the hanging wall is real, they are usually considered in a class by themselves.
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