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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.
In the first simulation, a 260 million-cubic-meter, 4-meter deep (9.2 billion-cubic-foot, 13-foot deep) lahar would originate on the west side of Mount Rainier. The debris flow would be equivalent ...
The glacier is one of four on Mount Rainier that are known to have released debris flows. Similar flows have stemmed from the Nisqually, Winthrop, and South Tahoma glaciers as well. [2] The glacier released a particularly large mudflow on October 2–3, 1947, when heavy rains melted and eroded the lower part of the glacier.
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. The material flows down from a volcano, typically along a river valley. [1] Lahars are often extremely destructive and deadly; they can flow tens of metres per second ...
The glacier is one of four on Mount Rainier that are known to have released debris flows. Similar flows have stemmed from the Nisqually , Kautz , and Winthrop glaciers as well. The glacier has at least 23 recorded debris flows since 1967, with 15 reported between the years 1986 and 1992.
Mount Rainier is a stratovolcano in the Cascade Volcanic Arc that consists of lava flows, debris flows, and pyroclastic ejecta and flows. Its early volcanic deposits are estimated at more than 840,000 years old and are part of the Lily Formation (about 2.9 million to 840,000 years ago).
Disturbing new videos give the clearest view yet of the moment the American Airlines passenger plane and Army helicopter exploded into pieces — sending huge chunks of fiery debris crashing into ...
The glacier is one of the most easily viewed on the mountain, and is accessible from the Paradise visitor facilities in Mount Rainier National Park. Nisqually Glacier is the source of the Nisqually River. [1] Perhaps the longest studied glacier on Mount Rainier, Nisqually's terminal point has been measured annually since 1918. [2]