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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.
Large lahars hundreds of metres wide and tens of metres deep can flow several tens of metres per second (22 mph or more), much too fast for people to outrun. [9] On steep slopes, lahar speeds can exceed 200 kilometres per hour (120 mph). [9] A lahar can cause catastrophic destruction along a potential path of more than 300 kilometres (190 mi). [10]
Inundation zone I : Pathways for eruption-related lahars due to large flanks collapses or pyroclastic flows, or floods in the Skagit River valley cause by displacement water in reservoirs by lahars Inundation Zone II : Pathways of lahars resulting from more frequent, small-for-moderate flank collapses from the area of Sherman Crater.
Relief map of Mount Unzen ... years ago saw the emplacement of large areas of pyroclastic flow and lahar ... of 75 degrees from vertical at a depth of 800 metres ...
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 ...
Mapanuepe lake is located at the confluence of Marella and Mapanuepe Rivers as the two rivers merge to become the Santo Tomas River. The subsequent rains following the 1991 eruption of Mount Pinatubo produced lahar that dumped volcanic debris on the Marella River, one of the major drainages of the mountain, aggrading the river that eventually dammed the Mapanuepe River.
The Mount Rainier Volcano Lahar Warning System consists of two separate components, operating in tandem: Acoustic Flow Monitors (AFM) and the All Hazard Alert Broadcast (AHAB) sirens. The AFM system was developed by the United States Geological Survey (USGS) in 1998 and is now maintained by Pierce County Emergency Management.
The Trout Lake Mudflow was a lahar in the U.S. state of Washington that descended from Mount Adams about 6,000 years ago. [1] It was the largest lahar at Mount Adams since the end of the last ice age , having emplaced about 66,000,000 m 3 (2.3 × 10 9 cu ft) of mud and rock in a deposit covering more than 16 km 2 (6.2 sq mi) of the White Salmon ...
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