A strong 6.4-magnitude earthquake struck off the coast of northern California on Tuesday, United States Geological Survey said.
The earthquake was at a depth of 16.1km, USGS said, adding that it struck 12km west-southwest of Ferndale, California.
Ferndale, a town of about 15,000 people, is 420 km north of San Francisco and 31.54km south of Eureka, California.
There was no risk of a tsunami after the quake, the U.S. tsunami warning system said.


Nigerian government secures release of 100 kidnapped students
Firefighter dies after Australian bushfires raze homes in two states
Israeli PM says he will meet Trump, second phase of Gaza plan 'close'
US envoy Kellogg says Ukraine peace deal is really close
Benin minister says armed forces foil coup attempt