Mount Rainier is America's most dangerous volcano. Scientists warn lahars could devastate 150,000 people with little warning.

After Mount St. Helens erupted in 1980, experts were faced with a precarious question: How can we best prepare for when—not if—the next volcanic eruption in the Cascade Range occurs? Triggered by a ...

Whenever Mt. Hood erupts, Portland will be glad to have David George. As a U.S. Geological Survey mathematician, George models landslides and lahars at the Cascades Volcano Observatory in Vancouver, ...

Volcanoes are often judged by the size of their eruptions, but volcanologists measure danger ...