Magnitude-6.9 Quake Strikes off Northern California - WSMV Channel 4

Magnitude-6.9 Quake Strikes off Northern California

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FERNDALE, CA (NBC) -- A magnitude-6.9 earthquake struck off the coast of Northern California Sunday night, the U.S. Geological Service reported.

The epicenter was 48 miles west-northwest of Ferndale and 50 miles west of Eureka at a depth of 4.3 miles, the USGS said.

The quake, which occurred at 10:18 p.m. PT (1:18 a.m ET), was initially reported as magnitude 6.1 on the Richter scale, but seismologists revised it upward to 6.9.

NBC Bay Area reported that police in Eureka said the shaking lasted between 20 and 30 seconds.

The Humboldt County Sheriff's Department, which oversees most of the nearby populated areas, said it had received no calls about damage or injuries, the AP reported.

The probability of a "strong and possibly damaging aftershock" of magnitude 5.0 or greater in the next seven days was 90 percent, the USGS warned, adding that there was a 5 percent to 10 percent of another quake as large as or larger than the initial one in the next week.

No destructive tsunami was expected, and no tsunami advisory was issued, The West Coast/Alaska and Pacific Tsunami Warning Centers said.

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