A preliminary 2.5 magnitude earthquake struck Tuesday afternoon near Redwood City, according to the United States Geological Survey.

LAKE COUNTY, CA - Tuesday morning, a 2.0 magnitude quake was reported close to Hidden Valley Lake, according to the U.S.

A new study reveals a 15% risk of a mega-tsunami hitting the US within 50 years. Triggered by the Cascadia Subduction Zone, ...