A 3.7 earthquake rattled San Ramon on Monday morning, following several earlier small quakes in the area, according to the U.S. Geological Survey. These come after a cluster of earthquakes in the last few weeks.

CONTRA COSTA COUNTY, CA - the U.S. Geological Survey reported that a preliminary 2.1 magnitude quake struck close to San Ramon Monday morning.

A shake alert went out over the U.S. Geological Survey's early warning system on Dec. 4, warning that a 5.9 earthquake near Carson City in western Nevada could produce heavy shaking in the region. But moments later, the survey announced the alert, which was sent to people as far west as San Francisco, was a false alarm.

SAN RAMON — A sense of shakiness in the Tri-Valley only grew Monday morning when three earthquakes rattled the area in the course of about 100 minutes. The biggest of the quakes was a magnitude 3.7 that shook at 9:07 a.m., according to the U.S. Geological Survey. That quake followed a 2.5 quake at 7:24 a.m. and a 2.6 shaker at 09:05.

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

The United States Geological Survey put out a false alarm for a 5.9 earthquake east of Dayton, Nevada, on Thursday morning.

An alert that notified Bay Area residents of a 5.9 earthquake Thursday morning in Nevada was deleted by the U.S. Geological Survey. The ShakeAlert message at 8:08 a.m. said the quake was about 15 miles east of Carson City, near Dayton. Within minutes, though, the notification was deleted.

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A small earthquake was detected miles from two North Carolina tourist communities in the Blue Ridge Mountains on Friday, federal seismologists reported. The 2.1 magnitude earthquake registered at 4:11 p.m. about 2.5 miles southeast of Weaverville and 9 miles south of Asheville, according to the U.S. Geological Survey.