Nearly 75% of the country is at risk for a potentially damaging earthquake in the next 100 years, according to a recently updated map from the U.S. Geological Survey. The map is the first to include all 50 states in a single USGS assessment, and it shows ...

Earthquakes occur several hundred times a day, every day, all over the globe. But most are only of a magnitude 2 or smaller, and rarely felt. It is only the notable earthquakes, usually of a magnitude 6 or higher, that become destructive to populated areas.