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To: U.S. West Coast, Alaska, and British Columbia coastal regions
From: NOAA/NWS/West Coast and Alaska Tsunami Warning Center
Subject: Tsunami Information Statement issued 10/20/2011 at 8:18PM PDT

At 8:16 PM Pacific Daylight Time on October 20, an earthquake with preliminary magnitude 4.1 occurred 10 miles/16 Km northeast of San Francisco, California .

The magnitude is such that a tsunami WILL NOT be generated. This will be the only WCATWC message issued for this event.

The location and magnitude are based on preliminary information. Further information will be issued by the United States Geological Survey or the appropriate regional seismic network.