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Washington has a majority of the very highest volcanoes, with 4 of the top 6 overall, although Oregon does hold a majority of the next highest peaks. Even though Mount Rainier is the tallest, Mount Shasta in California is the largest by volume, followed by Washington's Mount Adams.
This is a list of Cascade volcanoes, i.e. volcanoes formed as a result of subduction along the Cascadia subduction zone in the Pacific Northwest of North America. The volcanoes are listed from north to south, by province or state: British Columbia , Washington , Oregon , and California .
Stratovolcanoes of Washington (12 P) Pages in category "Volcanoes of Washington (state)" The following 40 pages are in this category, out of 40 total.
The Cascade volcanoes define the Pacific Northwest section of the Ring of Fire, an array of volcanoes that rim the Pacific Ocean. The Ring of Fire is also known for its frequent earthquakes. The volcanoes and earthquakes arise from a common source: subduction, where the dense Juan de Fuca Plate plunges beneath the North American Plate. [32]
The volcanoes in this category are found in California, Oregon, Washington, and British Columbia, and in two different mountain ranges, the Cascade Range and the Coast Mountains. The Cascade volcanoes are part of the Pacific Ring of Fire that includes over 160 active volcanoes.
The observatory's current territory covers Oregon, Washington, and Idaho. The Cascade Range's extent includes northern California , and Cascade volcanoes in that state, such as Mount Shasta and Lassen Peak , previously fell under the CVO's jurisdiction.
The Western Cascades or Old Cascades are a sub-province of the Cascade Range in the U.S. state of Oregon, between the Willamette Valley and the High Cascades. [1] The Western Cascades contain many extinct shield volcanoes, cinder cones and lava flows, and the region is highly eroded and heavily forested.
Compared to larger stratovolcanoes in the Cascade volcanic arc, Mount Washington, like the rest of Oregon's Matterhorns, had a relatively short eruptive life. [33] Several spatter cones produced basaltic andesite [1] on the lower northeastern side of the volcano, [52] following a fissure that reached 2.5 miles (4 km) from Washington's summit. [12]