MOUNT SHASTA, Calif. – For some, Mount Shasta’s summit is a milestone. For others, it’s the office. Mount Shasta presents a unique challenge for U.S. Geological Survey (USGS) scientists. With a peak ...

Waves of orange, glowing lava and smoky ash belched and sputtered Monday from the world’s largest active volcano in its first ...

Far beneath the forests and hot springs of the American West, the continent’s largest active volcanic system is rumbling in ways scientists are only now beginning to fully resolve. New seismic ...

Volcanic ash from the Andes fed ocean life, increased algae growth, and reduced carbon dioxide, slowly cooling Earth millions ...