An earthquake of magnitude 5.8 struck off northern California in the Pacific Ocean on Friday, the U.S. Geological Survey (USGS) said.
It was quickly followed by a second quake of 5.6 closer to shore, the USGS said.
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Both quakes struck west of the California town of Petrolia and were very shallow, amplifying their effects.
— Reporting by Sandra Maler in Washington; Editing by Alistair Bell
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