A fault line that could unleash a major earthquake is not where scientists thought it was. New research found the Concord ...

The fault has moved the curbs as much as a handspan, around 18 centimeters, since the time they were installed, up to 60 years ago.

At 4.1 magnitude near Greenback, the May 10 quake was large for our area. Experts look back on the last earthquakes to predict the future.

USGS detected the first quake, a 2.9 magnitude, Thursday afternoon, northeast of San Francisco. This tremor was located on Calaveras Fault, a major branch of the San Andreas Fault system.

Scientists are warning that a 1,000-foot-tall “mega tsunami” could potentially wipe a large chunk of America off the map – if a strong enough earthquake hits a specific active fault line ...