Massive 6.4 earthquake rocks California leaving thousands without power: Epicentre is seven miles south west of Ferndale and comes just days after 3.6 quake shook San Francisco
A massive 6.4 earthquake has rocked California with its epicentre 130miles north of San Francisco, three days after 3.6 quake shook the Bay Area.
The earthquake was at a depth of 16.1km, USGS said, adding that it struck 12km west-southwest of Ferndale, California.