A 6.5 magnitude earthquake has struck off the Northern California coast, about 27 miles southwest of Eureka.
The U.S. Geological Survey says the quake hit around 4:27 Saturday afternoon. Officials say they heard the quake caused some power outtages, but there were no immediate reports of injury or damage.
USGS geophysicist Richard Buckmaster says the quake was felt as far south as Capitola, and as far north as Tiller, Ore.
The San Francisco Bay area was struck by two light earthquakes on Thursday and Friday.
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According to the United States Geological Survey, a powerful earthquake with a magnitude of 6.5 hit North California today. The epicentre was  west of Ferndale, CA and  northwest of San Francisco, CA, with a depth of .

Media reports indicate that there is a power outage, and ruptured gas lines in several areas. Only minor injuries were reported, with several people being taken to St. Joseph's Hospital from a local mall by ambulance. 

One resident, Cole Machado, told CNN that "I was talking on the phone and all of a sudden it started shaking. I thought my TV was going to fall over,". Power and phone lines in his neighborhood were cut by downed trees.

No tsunami warnings were issued due to the tremors. Following the earthquake, there were numerous aftershocks, the strongest being at a magnitude of 4.5.