MOUNT RAINIER, Wash. — A swarm of small earthquakes was detected at Mount Rainier Tuesday morning, according to the U.S.

Experts believe a Mount Rainier eruption would post a grave threat to millions who live in the southern and eastern sections of the Seattle metropolitan area.

Scientists fear Washington’s Mount Rainier could trigger a swift debris flow caused by melting snow and ice. An event could endanger nearby populated areas.

Scientists fear Washington’s Mount Rainier could trigger a swift debris flow caused by melting snow and ice. An event could endanger nearby populated areas.

Washington’s intense bout with record-breaking temperatures likely triggered a glacial mudslide on Mount Rainer. Monitors registered the lahar Tuesday afternoon, saying it lasted for hours ...

Geologists have found evidence that at least 11 large lahars from Mount Rainier have reached into the surrounding area, known as the Puget Lowlands, in the past 6,000 years, Moran said.

And while Mount Rainier hasn't erupted in 1,000 years, the team with the USGS will be watching for when it shows the signs. Mount Rainier monitored closely as scientists keep watch for signs of ...

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.

In the wake of the Mount St. Helens eruption, the US Geological Survey set up an lahar detection system at Mount Rainier in 1998, which since 2017 has been upgraded and expanded.

Mount Rainier, a snowcapped volcano, looms over Puyallup Valley near Orting, Washington. The prospect of a lahar — a swiftly moving debris flow caused by melting snow and ice typically during a ...