These fast-moving mudflows can devastate towns in a matter of minutes.

MANILA, Philippines —No reports of lahar from Mayon Volcano have emerged after several days of rain, but state volcanologists have urged caution, as the possibility remains. In a public briefing on ...

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 ...

Mount Rainier’s snow-covered slopes hide one of the biggest volcanic hazards in the entire US (Picture: ) Mount Rainier looks ...

TROUT LAKE — As Pat Arnold plucked weeds from her yard with a view of snow-capped Mount Adams, she navigated around large boulders that hint at the volcano’s destructive past. Over the course of ...

MANILA, Philippines — Lahar flows were monitored in at least four waterways surrounding Kanlaon Volcano in the last couple of days, according to the Philippine Institute of Volcanology and Seismology ...

The Puyallup River valley can expect monthly chimes in lieu of blaring sirens going forward. Pierce County has upgraded the lahar siren system to include blue strobe lights, a voice message and a few ...

Mount Rainier was quiet Wednesday morning. The lahar siren at a Puyallup fire station was not. The lahar-warning system at the station at 311 W. Pioneer went off about 10 a.m. The Puyallup Police ...

Lahar is an Indonesian word for a rapidly flowing mixture of rock debris and water that originates on the slopes of a volcano. Lahars are also referred to as volcanic mudflows or debris flows. They ...