(Reuters) – A magnitude 5.1 earthquake struck in the Pacific Ocean off the Northern California coast on Thursday, about 70 miles (113 km) west of the town of Ferndale, the U.S. Geological Survey said.
Ferndale is about 190 miles (306 km) northwest of Napa, California, where a magnitude 6.0 earthquake in August struck nearby, injuring more than 200 people and causing millions of dollars in damage to buildings and the wine industry.
Reference
http://www.reuters.com/article/2015/01/01/us-usa-earthquake-california-idUSKBN0KA1NC20150101