False alarm raised over Napa quake 

The U.S. Geological Service says a computer at its Berkeley station mistakenly concluded that the Napa area was hit by a magnitude-5.0 earthquake.

Richard Buckmaster, a geophysicist at the USGS's National Earthquake Reporting Center, says officials are trying to determine why the computer generated the "dubious or erroneous" alert Friday afternoon. He says the center's equipment saw no evidence that Napa had experienced even a much smaller quake.

The false alarm created a flurry of activity for earthquake watchers and the news media, but otherwise disappeared from USGS system with the strike of a delete button.

Buckmaster says such inaccurate reports are exceedingly rare in California.

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