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.


Homeland Security to send hundreds more officers to Minnesota
US military targets IS in Syria strikes
Israeli fire kills three people in Gaza, tension rises
Tens of thousands protest in Minneapolis over fatal ICE shooting
