Magnitude-4.0 quake rattles northern California
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A shake map released by the US Geological Survey (USGS) on Aug 17, 2015 shows the location of a 4.2 magnitude earthquake, close to San Francisco, USA.
PHOTO: EPA
OAKLAND, California (Reuters) - A small earthquake shook northern California on Monday, delivering a "quick, short shake", according to a Reuters witness in Oakland.
The United States Geological Survey registered the quake at magnitude 4.0 on the Richter scale, centered 1km north of Piedmont.
