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SAN FRANCISCO, California (CNN) -- A 4.2-magnitude earthquake shook the San Francisco area Friday at 4:42 a.m. PT (7:42 a.m. ET), the U.S. Geological Survey reported.
The quake left about 2,000 customers without power, said David Eisenhower, a spokesman for Pacific Gas and Light.
Under the USGS classification, a 4.2-magnitude earthquake is considered "light," which it says usually causes minimal damage.