The quake, a 4.2 magnitude shaker centered near Isleton along the Sacramento-San Joaquin River Delta, comes one day before California is scheduled to test its earthquake preparedness.
A 4.2 magnitude earthquake was felt across California's Sacramento County and parts of the Bay Area on Wednesday morning, according to the United States Geological Survey (USGS).
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A 4.2 magnitude earthquake was felt across California's Sacramento County and parts of the San Francisco Bay Area on Wednesday morning, according to the U.S.