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 swarm of at least six earthquakes reaching up to magnitude 2.9 rattled San Ramon near San Francisco, the U.S. Geological Survey reports.

Portions of the North Bay were shook Sunday afternoon by a 4.0 magnitude earthquake that began in east Sonoma County, according to the U.S. Geological Survey.

A magnitude 7 earthquake has rocked Alaska on Saturday, Dec. 6, according to the United States Geological Survey (USGS).

Officials said the megaquake advisory is not a prediction and the probability of a magnitude 8 or larger quake is only about 1%, but there's hope it will serve as a wake-up call.

The federal government and earthquake experts blamed a technical glitch for the alert that sent warnings hundreds of miles away last week.

A powerful magnitude-7.5 earthquake struck off Japan’s northeastern coast on Monday, triggering evacuation orders and a tsunami warning for parts of the coastline.

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

A nagnitude-5.7 quake hits 67 miles northeast of Kuji, Japan, rattling coastal towns just days after a tsunami warning.

An earthquake with a preliminary magnitude of 5.7 struck Guam at 9:06 a.m., the U.S. Geological Survey reported.