The 2.8 magnitude earthquake occurred at about 5:30 p.m. local time on Tuesday, with shaking felt across Virginia and beyond.

Nearly all of California has a more than 95% chance of a damaging earthquake in the next century, a new United States Geological Survey map shows. The new USGS National Seismic Hazard Model ...

A team of USGS researchers in Flagstaff are working to develop an all new geologic map of the Grand Canyon region.

Maps showing where magma is moving or lava is advancing are also in this category. As this information is immediately required, HVO (and other USGS volcano observatories) have special ...