Recent volcanic activity across the Pacific Ring of Fire has raised alarms among scientists and volcanologists, with several ...

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

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.

Surviving a lahar Mount Rainier's cousin Mount St. Helens, farther south in the Cascade Range, triggered a devastating lahar when it erupted four decades ago.

A swarm of earthquakes under the largest volcano in the Cascade Mountain Range has some people wondering if it's rumbling ...

In the shadow of Washington State’s Mount Rainier, about 90,000 people live in the path of a potential large lahar—a destructive, fluid and fast-moving debris flow associated with ...

The activity began just before 1:30 a.m. on July 8, with hundreds of earthquakes recorded at depths ranging from over a mile ...

USGS Cascades Volcano Observatory geophysicist Rebecca Kramer works on station PR05, part of the Mount Rainier lahar detection network. The system has been upgraded and expanded since it was first ...

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.

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.

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.