Lahar
Violent type of mudflow or debris flow from a volcano / From Wikipedia, the free encyclopedia
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This article is about volcanic mudflow. For other uses, see Lahar (disambiguation).
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]
Lahars can be extremely destructive: they can flow tens of metres per second, they have been known to be up to 140 metres (460 ft) deep, and large flows tend to destroy any structures in their path. Notable lahars include those at Mount Pinatubo in the Philippines and Nevado del Ruiz in Colombia, the latter of which killed thousands of people in the Armero tragedy.