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Offshore Quakes Rattle Southern California

Several small earthquakes have jiggled the ocean floor off Southern California.

This USGS map shows the size and location of recent earthquakes in Southern California, including two offshore temblors that shook the region on January 11, 2011.

Above: This USGS map shows the size and location of recent earthquakes in Southern California, including two offshore temblors that shook the region on January 11, 2011.

A magnitude-3.1 quake at 8:52 a.m. Tuesday was the closest to the mainland, occurring under Santa Monica Bay four miles west of Hermosa Beach.

The U.S. Geological Survey's community reporting system indicates it was felt lightly along much of the Los Angeles County coast.

Three other undersea quakes were recorded earlier at the western end of the Channel Islands.

The USGS says the largest was a magnitude-3.6 tremor off San Miguel Island at 2:09 a.m. The area about 60 miles southwest of Santa Barbara also had quakes of magnitude 3.4 and 2.5 within the following hour.

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