The epicenter for all the quakes was about one mile east of Hayward, in San Francisco's East Bay, according to the U.S. Geological Survey

A preliminary magnitude 3.7 earthquake rattled the Bay Area on Thursday afternoon after a series of smaller quakes hours before in the same area, according to the U.S. Geological Survey. The latest shake happened at 1:59 p.m., with an epicenter about 1.2 miles east of Hayward and a depth of about 4.34 miles.

A series of small earthquakes shook the San Francisco Bay Area on Thursday, according to the United States Geological Survey. The earthquakes all struck near Hayward, Calif., just south of Oakland. A minor, 3.3-magnitude earthquake happened at 11:52 a.m. Pacific time about 1 mile east of Hayward, Calif., data from the agency shows.