New seismic imaging shows magma lingering beneath quiet Cascade volcanoes, shaping how scientists monitor and plan for eruptions.

Studies reveal that beneath seemingly tranquil mountains, magma boils in shallow layers, reducing volcanic warning time.

The Cascades Volcano Observatory, part of the federal monitoring network, maintains seismometers, GPS stations and gas samplers on and around the major peaks, feeding data into models that track how ...

At the risk of this blog becoming all volcanoes, all the time, I bring you... more volcanoes! Two of my favorite geobloggers wrote mustn't-miss posts on some of our Cascades volcanoes. They showcase ...

New research offers clues as to why Mount St. Helens is one of the most explosive volcanoes in the Cascade range and why it stands apart from the chain of other Cascade volcanoes. Scientists from the ...

More than 300 earthquakes have erupted at Washington's Mount Rainier this week, the largest earthquake swarm at the volcano since 2009. As of Thursday, July 10, 334 earthquakes had been identified at ...

Scientists at the rim of the volcano smelled hydrogen sulfide, similar to rotten eggs, said Jeff Wynn, chief scientist for volcano hazards at the U.S. Geological Survey's Cascade Volcano Observatory.