Thirty-one years ago, John Ewert was a college graduate fascinated with Mount St. Helens. Today, he's the new scientist in charge of the U.S. Geological Survey's Cascades Volcano Observatory in ...

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 ...

Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern California, looms above Little Glass Mountain, a thick obsidian flow erupted from the Medicine Lake shield volcano about 1,000 years ...

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.

Tourists scrambled to get away from a volcanic eruption in Italy on June 2. Mount Etna, located on the eastern coast of Sicily and one of Europe's most active volcanoes, sent an ash cloud into the air ...

MT. ST. HELENS, Wash — For many people who lived through the 1980 eruption of Mount Saint Helens, it is the biggest news story of their lifetimes. 45 years ago, the mountain that had been rumbling for ...

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 ...

Earlier this month, Mount Rainier experienced its most powerful seismic swarm ever recorded by the U.S. Geological Survey. More than 1,000 earthquakes have been detected at the mountain since July 8 — ...

“It’s now a larger swarm than anything we’ve seen since we’ve been (seismic) monitoring anything at Mount Rainier,” Alex Iezzi, a research geophysicist, said in an interview Thursday. Researchers ...

A "swarm" of earthquakes began at Mount Rainier in Washington in the early morning hours on Tuesday with hundreds of quakes detected so far, making it the largest such event at the volcano since 2009.