A magnitude-6.5 earthquake struck off the coast of Northern California yesterday afternoon, shaking buildings south of the Oregon border and knocking out power in several coastal communities.

The powerful quake hit about 2:27 p.m. HST about 22 miles from Ferndale, the U.S. Geological Survey said.

The Pacific Tsunami Warning Center in Ewa Beach said there was no tsunami threat to Hawaii.

Authorities in Eureka and other area communities said no major injuries were reported.

But several people received minor cuts and scrapes from broken glass at the Bayshore Mall in Eureka, fire spokesman Gary Bird said.

He said that “;we've come through this pretty well for the magnitude of earthquake we've had.”;

Pacific Gas & Electric Co. spokesman J.D. Guidi said power outages were widespread across most of Humboldt County, affecting about 25,000 customers.

Several traffic lights fell and residents reported water, gas and sewer leaks, Humboldt County Office of Emergency Services spokeswoman Jo Wattle said.

According to the USGS, the quake hit at a depth of nearly 10 miles. At least nine aftershocks followed in the hours after the quake, the biggest registering at a magnitude of 4.5.

The quake was felt as far south as Capitola in central California, and as far north as central Oregon, USGS geophysicist Richard Buckmaster said.

The area is about 270 miles north of San Francisco in a coastal area known for periodic earthquakes. In 1964, a tsunami washed away 11 people in Crescent City. It is the only tsunami to take lives in the continental United States.