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The Cascade volcanoes have had more than 100 eruptions over the past few thousand years, many of them explosive eruptions. [21] However, certain Cascade volcanoes can be dormant for hundreds or thousands of years between eruptions, and therefore the great risk caused by volcanic activity in the regions is not always readily apparent.
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 .
The Cascade Volcanoes are an active volcanic region along the western side of the Pacific Northwest. The Columbia Plateau is a region of subdued geography that is inland of the Cascade Volcanoes, and the North Cascades are a mountainous region in the northwest corner of the United States, extending into British Columbia.
The only volcanoes known to have produced eruptions within the VEI 7 range are Crater Lake, the Mt. Baker Volcanic Field, and the Lassen Volcanic Center. All of the exceptionally large caldera-forming eruptions within the cascades erupted silica-rich magmas, with the three VEI 7s erupting mainly rhyodacite and rhyolite .
Broken Top is a glacially eroded complex stratovolcano.It lies in the Cascade Volcanic Arc, part of the extensive Cascade Range in the U.S. state of Oregon.Located southeast of the Three Sisters peaks, the volcano, residing within the Three Sisters Wilderness, [4] is 20 miles (32 km) west of Bend, Oregon in Deschutes County.
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More than 400 earthquakes have been detected beneath Washington's Mount St. Helens in recent months, though there are no signs of an imminent eruption, according to the U.S. Geological Survey.
Today, the region is heavily managed for logging and recreation, and it is an important water source for lower elevation urban, suburban, and agricultural areas. It is the second-largest of the Cascades subregions, covering 2,729 square miles (7,070 km 2 ) in Oregon and 1,828 square miles (4,734 km 2 ) in Washington.