The U.S. Geological Survey was warning residents Monday about a letter circulating on the Internet claiming that a large earthquake was imminent in Southern California. The letter had a USGS logo a… ...

Looks like the April Fools' Day pranks are already well underway as a phony letter using the U.S. Geological Survey (USGS) letterhead has been circulating around SoCal warning folks about a ...

Scientists at the U.S. Geological Survey have developed a new mapping tool, the Pedestrian Evacuation Analyst, for use by researchers and emergency managers to estimate how long it would take for ...