Scientists adding more sensors to detect lahars on Mount Rainier Lahars are huge mudflows that come down from a volcano, typically along a river valley, and can threaten those living nearby.

"Mount Rainier may be one of the most iconic volcanoes in the U.S., but it's also considered the most dangerous. In this video, we dive into why Mount Rainier poses such a significant threat, from its ...

Mount Rainier is one of the most closely monitored volcanoes in the United States, but not for the reason most people think. While recent headlines sparked fears of a possible eruption, scientists say ...

Danger from Mount Rainier isn’t always born from smoke and ash. According to the United States Geological Survey, the last significant event to happen at Mount Rainier was a no-notice lahar: a ...

NEAR MT. RAINIER, Wash. — The destructive flow of volcanic debris, mud, and water unleashed by the 1980 eruption of Mount St. Helens destroyed more than 200 homes. These “lahars,” as they're called, ...

SEATTLE — No, there is not increased activity at Mount Rainier, despite a national headline Wednesday morning claiming there is an uptick in seismic activity happening on the mountain. The Daily Mail ...

SPOKANE, Wash. – Experts are worried about the tallest mountain in the Cascade Range, according to National Geographic magazine. The article titled “This May be the Most Dangerous U.S. Volcano,” ...

An outpouring of magma isn’t the biggest risk to people downhill from Mount Rainier. The active volcano’s greatest danger comes from lahars — amalgams of mud, rock and water that are as dense as wet ...

USGS: no-notice lahars can occur without eruption signals. Report: 41% of residents and 46% of homes lie in lahar zone. City urges immediate evacuation; sirens, bilingual alerts; drill Apr 23, 2026.