6.5-magnitude earthquake strikes 100 miles off Northern California coast

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A 6.8 magnitude earthquake struck about 100 miles off the coast of Eureka, Calif., on Thursday, Dec. 8, 2016.

A 6.8 magnitude earthquake struck about 100 miles off the coast of Eureka, Calif., on Thursday, Dec. 8, 2016.

EUREKA, Calif. — A magnitude 6.5 earthquake was reported off the Northern California coast on Thursday morning, the U.S. Geological Survey said.

The quake struck at 6:50 a.m. PST and was 105 west of Ferndale, Calif., and 112 miles west of Eureka. It was measured at a depth of 6.2 miles.

It originally was measured as a magnitude 6.8 but then was downgraded to a 6.5.

Shaking was reported along the Northern California coast and in southern Oregon. Some light shaking was also reported as far south as San Francisco.

There were no reports of any injuries or damage.

The Pacific Tsunami Warning Center said there is no tsunami threat from the earthquake.

The area is one of the most active areas for seismic activity. Major earthquakes and deadly tsunamis have been produced there in the past.