A lahar ( / ˈlɑːhɑːr /, from Javanese: lahar, ꦭꦲꦂ) is a violent type of mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris and water.

Dec 6, 2023 · Lahar is an Indonesian word describing a mudflow or debris flow that originates on the slopes of a volcano. Small debris flows are common in the Cascades, where they form …

Lahars are mixtures of water, volcanic ash, tephra, rock fragments, and chunks of ice that can flow like wet concrete. The term comes from the Indonesian word for these destructive …

lahar, mudflow of volcanic material. Lahars may carry all sizes of material from ash to large boulders and produce deposits of volcanic conglomerate.

Many volcanologists prefer to define a lahar as caused by a volcanic eruption. But in ancient deposits, it is not always possible to determine if the lahar was caused directly by eruption or …

Monitoring systems are in place: Rainier has lahar detection networks installed along key river valleys; these can trigger alarms and provide precious minutes for people downstream to …

Dec 3, 2025 · A lahar is a swift, destructive volcanic mudflow or debris flow composed of volcanic material and water. The term originates from the Indonesian language, describing flows that …

May 12, 2023 · Derived from the Indonesian term for "lava stream," a lahar is a rapidly flowing mixture of rock debris, ash, and water that comes racing down the sides of volcanoes. Proper …

L A H A R (<Javanese: lahar, lava) is the slurry mixture of ash, fragmented rocks and water resulting from a volcanic flow of mud and debris. It forms one of the geological soils of the land …

Nov 4, 2023 · General information about lahars, their triggering mechanisms, and their related hazards can be found in the lahar hazards section of the Volcano Hazards Program website.