Volunteer for a Free Well Water Sample! The Colorado Geological Survey, funded by the Colorado Department of Public Health & Environment, is conducting a baseline study on radionuclides and ...

The sediments underlying the Salt Lake Valley are thicker in places than previously thought, indicating that current seismic ...

The U.S. Geological Survey has been tracking a swarm of recent earthquakes in the Frank Church River of No Return Wilderness.

The 1980 eruption cycle made Mount St. Helens one of the most famous volcanoes in the Cascades. But it is far from the only ...

North America's deepest gorge, Hells Canyon, which slithers along the border of Idaho and Oregon, is a surprisingly new ...

Greek Emergency Management warned of a possible tsunami risk after the quake. A 6.1 magnitude earthquake was reported near Greece early Wednesday local time, according to the United States ...