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

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.

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.

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

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 ...

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.

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.

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.