A preliminary 3.9-magnitude earthquake hit the South Bay Monday morning, according to U.S. Geological Survey officials.
The quake struck at 9:39 a.m. and the epicenter was about 5 miles northeast of Alum Rock.
Social media users in Fremont, San Jose and South Bay cities reported feeling a jolt when the earthquake occurred.
Last modified April 16, 2018 3:56 pm
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