Mount Rainier - Wikipedia
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).
Mount Rainier | U.S. Geological Survey - USGS.gov
Large lahars (volcanic mudflows) from eruptions and from collapses of this massive, heavily glaciated andesitic volcano have reached as far as the Puget Sound lowlands. Since the last ice age, several dozen explosive eruptions spread tephra (ash, pumice) across parts of Washington.
Volcanoes - Mount Rainier National Park (U.S. National Park Service)
2021年11月5日 · Mount Rainier is an episodically active composite volcano, also called a stratovolcano. Volcanic activity began between one half and one million years ago, with the most recent eruption cycle ending about 1,000 years ago.
The Eruption History of Mount Rainier | U.S. Geological Survey - USGS.gov
2023年11月7日 · 500,000 years ago marks the beginning of the voluminous and continuous volcanic rock record that we call Mount Rainier. For the first approximately 80,000 years the new volcano was highly active, producing a thick apron of pyroclastic flows that are well exposed above Glacier Basin.
How dangerous is Mount Rainier? | U.S. Geological Survey - USGS.gov
Although Mount Rainier has not produced a significant eruption in the past 500 years, it is potentially the most dangerous volcano in the Cascade Range because of its great height, frequent earthquakes, active hydrothermal system, and extensive glacier mantle.
Mount Rainier: One of Our Nation's Most Dangerous Volcanoes - Geology.com
Mount Rainier, an active volcano currently at rest between eruptions, is the highest peak in the Cascade Range. Its edifice, capped by snow and 25 glaciers, has been built up by untold eruptions over the past 500,000 years.
Why Mount Rainier is the US volcano keeping scientists up at night
2024年6月30日 · ORTIG, Washington — The snowcapped peak of Mount Rainier, which towers 2.7 miles above sea level in Washington state, has not produced a significant volcanic eruption in the past 1,000 years.
Mount Rainier | National Park, History, Eruptions, & Map
2024年10月21日 · Mount Rainier, highest mountain (14,410 feet [4,392 meters]) in the state of Washington, U.S., and in the Cascade Range. It lies about 40 miles (64 km) southeast of the city of Tacoma, within Mount Rainier National Park. An active volcano, it …
Mount Rainier National Park (U.S. National Park Service)
2024年10月30日 · An active volcano, Mount Rainier is the most glaciated peak in the contiguous U.S.A., spawning five major rivers. Subalpine wildflower meadows ring the icy volcano while ancient forest cloaks Mount Rainier’s lower slopes. Wildlife abounds in the park’s ecosystems. A lifetime of discovery awaits.
Rainier - Global Volcanism Program
Mount Rainier is a heavily glaciated andesitic volcano in the Puget Sound region. Large Holocene mudflows from collapse have reached as far as the Puget Sound lowlands. The present summit was constructed within a large crater breached to the NE, formed by collapse during a major explosive eruption about 5,600 years ago that deposited the ...