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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)
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).
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 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.
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.
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.
Excerpt from main map showing the putative Hood Canal Fault (dashed line) running up Hood Canal and Dabob Bay, the Dabob Bay Fault Zone (DBFZ), Saddle Mountain faults (SM), and western end of the Seattle Fault zone (approximate). Hood Canal marks an abrupt change of physiography between the Puget Lowland and the Olympic Mountains to the west.
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 ...