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 DIEGO COUNTY, CA - A preliminary 3.1 magnitude quake was recorded near Borrego Springs at midnight on Tuesday, according to the U.S. Geological Survey.

The U.S. Geological Survey reports the small earthquake struck just before 3 p.m. about 1 mile west of Piedmont in Alameda County.

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.

IMPERIAL COUNTY, CA - A preliminary 2.5 magnitude quake was recorded near El Centro Monday night, 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.

A notification about a magnitude-5.9 earthquake in western Nevada near the California border was a false alert, the USGS said.

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.