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

Something stirred beneath Mount Rainier this summer, sending over 1,000 earthquakes through the ground in weeks—the largest swarm ever recorded at this towering volcano. Seismometers glowed with ...

The belfry of St. James the Apostle Parish Church stands with Mayon Volcano smoking in the background. It is all that remains of the church after Mayon Volcano erupted violently on February 1, 1814, ...

Whenever Mt. Hood erupts, Portland will be glad to have David George. As a U.S. Geological Survey mathematician, George models landslides and lahars at the Cascades Volcano Observatory in Vancouver, ...

Mount Rainier’s seismic sensors showed unusual activity for several days, prompting widespread attention online, but experts told KIRO 7 News the readings came from a malfunctioning instrument rather ...

LEGAZPI CITY—Local government and disaster response officials in Albay have stepped up precautions against possible lahar flows as Tropical Storm “Ada” threatens to bring heavy rains to the province.

Volcanism, tectonics and sedimentation / Richard V. Fisher and Gary A. Smith -- Volcanism as a process of sedimentological significance. Volcanism, climate change and the geolgoical record / Michael R ...

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 ...