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active fault

active fault
The Emerson fault, one of the segments that ruptured in the M7.2 1992 Landers, Californio earthquake. Photo credit: Kerry Sieh, Caltech
An acive fault is a fault that is likely to be the site of another earthquake sometime in the future. Faults are commonly considered to be active if they have moved one or more times in the last 10,000 years.

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Source: U.S. Geological Survey