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.
Both quakes struck west of the California town of Petrolia and were very shallow, amplifying their effects.
Visitors to the USGS website from Humboldt County reported feeling light shaking from the earthquakes.
There are no immediate reports of damage or injuries.
According to the National Weather Service, there is no tsunami threat.
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