The clusters of earthquakes have all been underneath the East Bay suburb of San Ramon, which is close to the Calaveras fault. There were at least 19 earthquakes of magnitude 2 or greater on Monday alone.

A powerful, magnitude-7.0 earthquake has struck in a remote area near the border between Alaska and the Canadian territory of Yukon on Saturday.

A minor, 3.6-magnitude earthquake struck in the San Francisco Bay Area on Monday, according to the United States Geological Survey. The temblor happened at 9:07 a.m. Pacific time about 2 miles southeast of San Ramon, Calif., data from the agency shows. U.S.G.S. data earlier reported that the magnitude was 3.7.

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Japanese authorities have cautioned the public over potential aftershocks after the initial earthquake struck around 11:15 p.m local time on Monday.

CONTRA COSTA COUNTY, CA - Monday morning, a preliminary 3.0 magnitude quake was detected near San Ramon, according to the U.S. Geological Survey.