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replica north face jackets e things to know about faults in California:WHAT ARE FAULTS?— Faults are fractures between two blocks of rock that form the Earth's crust. A big earthquake can result when the blocks move. But faults can be difficult to discover when there is nothing on the surface such as visible fissures to indicate their presence. At least part of the West Napa Fault falls into this category, according to Boatwright. An earthquake such as the temblor that struck Sunday can help scientists spot and study faults. The speed at which one side of the fault slides past the other determines earthquake activity. The fastest moving faults have more and larger ear
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