Was that an earthquake you just felt or merely a big truck rumbling by? You don't have to wonder thanks to the U.S.

Most are below 3.0 magnitude, so small that they aren’t felt. But a few, like the 1906 San Francisco earthquake, are massive, capable of widespread destruction.

In California, where the next “Big One” is an always-looming threat, some lessons learned from the 1925 Santa Barbara quake ...

Wednesday marks the 112th anniversary of the devastating 1906 earthquake and subsequent inferno that ravaged San Francisco and surrounding areas. More than 3,000 people are believed to have died ...