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Dec 6, 2023 · Lahars can flow many miles downstream from the volcano, making this the most threatening hazard in the Cascades. Lahars transform the landscapes around Cascade Volcanoes. Lahar is an Indonesian word describing a mudflow or debris flow that originates on the slopes of a volcano.
A lahar ( / ˈlɑːhɑːr /, from Javanese: ꦮ꧀ꦭꦲꦂ) is a violent type of mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris and water. The material flows down from a volcano, typically along a river valley. [1]
Lahar, mudflow of volcanic material. Lahars may carry all sizes of material from ash to large boulders and produce deposits of volcanic conglomerate. Lahars may be the result of heavy rain on loose ash material such as deposits of nuées ardentes (dense clouds of gases charged with incandescent.
- The Editors of Encyclopaedia Britannica
Lahars (volcanic mudflows) are among the most destructive of volcanic phenomena. They are important processes on composite volcanoes, like those in the Cascade Range in the Pacific Northwest and Aleutian volcanic arc in Alaska. Lahars are mixtures of water, volcanic ash, tephra, rock fragments, and chunks of ice that can flow like wet concrete.
Nov 6, 2014 · Lahars are rapid flows of mud–rock slurries that can occur without warning and catastrophically impact areas more than 100 km downstream of source volcanoes.
Mar 29, 2024 · Volcanic debris flows that originate at potentially active volcanoes are called lahars. Lahars are like debris flows in non-volcanic terrain but can most notably differ in origin and size.
