When most of us think about active volcanoes in the U.S., Mount St. Helens, Mt. Rainier and a few others will first come to mind. However, one of the most active volcanoes in the region is about a ...

A seismic survey challenges the long-standing belief that only active volcanoes have large magma bodies sitting beneath them.

Mount Rainier is central to Tacoma’s identity, so much so that it appears on the city’s logo. But as CNN recently reported, the striking mountain is also an active volcano — and no one knows when it ...

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and Glacier Peak are four of the active volcanoes in Washington state. The fifth, located less than 70 miles from Seattle, is Mount Rainier. "It's totally at a state of background activity ...

It appears that these magma bodies exist beneath volcanoes over their whole lifetime, not just during an active state.' ...

Millions of people around the world live near one of the roughly 1,500 active volcanoes on Earth—from Italy’s Campi Flegrei to Indonesia’s Merapi to the United States’ Mount Rainier.

The subterranean aquifer lurking in the mountains contains three times as much water as Lake Mead at full capacity.

Scientists have found giant magma reservoirs under dormant volcanoes in the Cascades. A new study shows that the magma system can persist even after eruptions.