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A lahar travels down a river valley in Guatemala near the Santa Maria volcano, 1989. A lahar (/ ˈ l ɑː h ɑːr /, from Javanese: ꦮ꧀ꦭꦲꦂ) is a violent type of mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris and water.
These are called lahars; [11] when the lahar contains large material such as blocks of rock and trees, it is a volcanic debris flow. [12] Lahars can form directly from a pyroclastic material flow flowing into a river, or could possibly form after the main eruption.
Detailed map of Mount Rainier's summit and northeast slope showing upper perimeter of Osceola collapse amphitheater (hachured line) The Osceola Mudflow, also known as the Osceola Lahar, was a debris flow and lahar in the U.S. state of Washington that descended from the summit and northeast slope of Mount Rainier, a volcano in the Cascade Range during a period of eruptions about 5,600 years ago.
A lahar is a debris flow related in some way to volcanic activity, either directly as a result of an eruption, or indirectly by the collapse of loose material on the flanks of a volcano. A variety of phenomena may trigger a lahar, including melting of glacial ice, sector collapse , intense rainfall on loose pyroclastic material, or the outburst ...
Lahar flows from the 1985 eruption of Nevado del Ruiz, which totally destroyed Armero in Colombia The most dangerous eruptive feature are the pyroclastic flows generated by material collapse, which move down the side of the mountain at extreme speeds [ 40 ] of up to 700 km (435 mi) per hour and with the ability to extend the reach of the ...
A wide variety of volcanic processes can produce tsunamis. This includes volcanic earthquakes, caldera collapse, explosive submarine eruptions, the effects of pyroclastic flows and lahars on water, base surges with accompanying shock waves, lava avalanching into the sea, air waves from explosive subaerial eruptions, avalanches of cold rock, and avalanches of hot material. [1]
The lahar-warning system at the station at 311 W. Pioneer went off about 10 a.m. The Puyallup Police Department posted on Twitter about 10:30 a.m. that the siren was a false alarm and that it was ...
One wall of the Étang Sec crater collapsed and propelled a mass of boiling water and mud (a lahar) into the Blanche River, flooded the Guérin sugar works and buried about 150 victims under 60 to 90 m (200 to 300 ft) of mud. Refugees from other areas rushed into Saint-Pierre.