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English: Hazard map around the Mount Rainier, state of Washington, United States. Lava flow and pyroclastic flows Electron Mudflow-sized event (generally large in size)
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.
Hazard map. 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).
In the wake of the Mount St. Helens eruption, the US Geological Survey set up an lahar detection system at Mount Rainier in 1998, which since 2017 has been upgraded and expanded.
Mount Rainier is an active volcano. With 28 major glaciers, it’s also the “most glaciated peak” in the contiguous U.S. and the tallest peak in the Cascade Range, according to the park.
Mount Adams was last active about 1,000 years ago and has created few eruptions during the past several thousand years, resulting in several major lava flows, the most notable being the A. G. Aiken Lava Bed, the Muddy Fork Lava Flows, and the Takh Takh Lava Flow. One of the most recent flows issued from South Butte created the 4.5-mile (7.2 km ...
The Volcano erupted about 150 BP, producing a 22.5 km (14.0 mi) long lava flow. Mount Rainier erupted 1854. Mount Baker erupted in 1880; fumaroles still occur at its summit. Ruby Mountain might have erupted in 1898. Lassen Peak erupted in 1914–5. Mount St. Helens erupted in 1980, killing 57 people. (see 1980 eruption of Mount St. Helens).
Also intersecting at Mount St. Helens is a NE (045°) trending line (red) of Pleistocene (about 4 Ma) plug domes and a topographic lineament (followed in part by Highway 12). [203] This line is the southernmost of a band of NE trending faults and topographical lineaments that extend from the Oregon coast into the North Cascades.