Studying tree rings helped scientists pinpoint when Mount Rainier last sent a lahar down its steep slopes, which could help ...

The snowcapped peak of Mount Rainier, which towers 4.3 kilometers (2.7 miles) above sea level in Washington state, has not produced a significant volcanic eruption in the past 1,000 years. Yet, more ...

The most destructive volcanic eruption in United States history happened less than half a century ago in Washington state. On May 18, 1980, the north side of Mount St. Helens, in southwestern ...

(CNN) — The snowcapped peak of Mount Rainier, which towers 4.3 kilometers (2.7 miles) above sea level in Washington state, has not produced a significant volcanic eruption in the past 1,000 years. Yet ...

While they will have minimal to no effect on the “restiveness” of volcanoes, storms and heavy rainfall may, however, trigger ...

OLYMPIA, Wash. (AP) -- A new report estimates that property losses from a massive mudflow at Mount Rainier could reach $6 billion in western Washington's Puyallup Valley. Major mudflows, known as ...

CAMP MURRAY -- The Washington emergency alert system accidentally sent a warning Friday to all broadcast outlets statewide that a lahar -- a massive, volcanic-caused mudflow -- had occurred. State ...