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A 6.4-magnitude earthquake struck off the coast of northern California early Tuesday but there was no tsunami threat, seismologists said.
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The relatively shallow quake hit 25 miles (40 kilometers) southwest of the port city of Eureka, in Humboldt county, the US Geological Survey said.
In a preliminary assessment, the USGS said there was a low likelihood of casualties but some damage was possible.
The National Tsunami Warning Center said a tsunami was not expected.
Power supplies appeared to have been hit, with nearly 60,000 customers without electricity in Humboldt County, according to poweroutage.us.
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“Power is out across the county. Do not call 911 unless you are experiencing an immediate emergency,” Humboldt Country Office of Emergency Services tweeted.
Around a dozen small aftershocks were reported in the area, USGS said.
California is regularly shaken by tremors and seismologists say a quake capable of causing widespread destruction is almost certain to hit the state in the next 30 years.
A 6.7-magnitude earthquake in 1994 in Northridge, northwest of Los Angeles, left at least 60 people dead and caused an estimated $10 billion in damage, while a 6.9 quake in San Francisco in 1989 claimed the lives of 67 people.
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