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]

2023年12月6日 · 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 during periods of heavy rainfall, rapid snow melt, and by shallow landsliding.

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 mudflows that cause both property damage and loss of life. They can occur with little to no warning.

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 …

2023年5月12日 · A lahar is a complex natural event characterized by a viscous, fast-moving flow of materials, predominantly originating from a volcanic source. They can be classified into two main categories: debris lahars and mudflow lahars.

Lahar is an Indonesian term that describes a hot or cold mixture of water and rock fragments that flows down the slopes of a volcano and typically enters a river valley. Small seasonal events are sometimes referred to as "debris flows", especially in the Cascades.

2024年3月6日 · The term lahar is of Indonesian Javanese origin. It describes fast-flowing cold or hot pyroclasts and water mixtures. Indonesia is famous for many of these volcanic mudflows. Berend George Escher, a Dutch geologist, applied the name lahar for the first time in 1922.

2019年11月11日 · A lahar is a violent and dangerous debris flow or mudflow composed of a slurry of rocky debris, pyroclastic material, and water. Typically, the materials flow from a volcano down along a river valley.

2024年3月29日 · Lahars are like debris flows in non-volcanic terrain but can most notably differ in origin and size. Primary lahars occur during eruptions and may have novel origins such as turbulent mixing of hot rock moving across ice- and snow …

Lahar, an Indonesian word for volcanic mudflow, is a mixture of water, mud, and volcanic rock flowing swiftly along a channel draining a volcano. Lahars can form during or after eruptions, or even during periods of inactivity.