Editing Cascadia subduction zone (section)

==Cascade Volcanic Arc==
[[File:Cascade Volcanic Arc.jpg|thumb|upright=1.4|Juan de Fuca triple junctions and the Cascade Volcanic Arc]]
{{Main|Cascade Volcanoes}}

The [[Cascade Volcanic Arc]] is a [[continental arc]] of [[volcanoes]] that extends from northern [[California]] to the coastal peninsula of [[Alaska]].<ref>{{cite web |url=https://geology.com/plate-tectonics.shtml |title= Plate Tectonics Map – Plate Boundary Map |access-date=2020-11-18 |first1=Hobart M |last1=King| website=geology.com}}</ref> The arc consists of a series of [[Quaternary]] age stratovolcanoes that grew on top of pre-existing geologic materials that ranged from [[Miocene]] volcanics to [[Glacier|glacial ice]].<ref name="emporia.edu"/> The Cascade Volcanic arc is located approximately 100&nbsp;km inland from the coast, and forms a north-to-south chain of peaks that average over 3,000&nbsp;m (10,000&nbsp;ft) in elevation.<ref name="emporia.edu"/> The major peaks from south to north include:
* [[Lassen Peak]] and [[Mount Shasta]] (California)
* [[Crater Lake]] (Mazama), [[Three Sisters (Oregon)|Three Sisters]], [[Mount Jefferson (Oregon)|Mount Jefferson]], [[Mount Hood]] (Oregon)
* [[Mount Adams (Washington)|Mount Adams]], [[Mount St. Helens]], [[Mount Rainier]], [[Glacier Peak]], [[Mount Baker]] (Washington)
* [[Mount Garibaldi]] and [[Mount Meager massif]] (British Columbia)

The most active volcanoes in the chain include Mount St. Helens, Mount Baker, Lassen Peak, Mount Shasta, and Mount Hood. Mount St. Helens captured worldwide attention when it [[1980 eruption of Mount St. Helens|erupted catastrophically in 1980]].<ref name="emporia.edu"/> St. Helens continues to rumble, albeit more quietly, emitting occasional steam plumes and experiencing small earthquakes, both signs of continuing magmatic activity.<ref name="emporia.edu"/>

Most of the volcanoes have a main, central vent from which the most recent eruptions have occurred. The peaks are composed of layers of solidified [[Andesite|andesitic]] to [[Dacite|dacitic]] [[magma]], and the more siliceous (and explosive) [[rhyolite]].

===Volcanoes above the subduction zone===
The volcanoes above the subduction zone include:

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* [[Silverthrone Caldera]]
* [[Mount Meager massif]]
* [[Mount Cayley]]
* [[Mount Garibaldi]]
* [[Mount Baker]]
* [[Glacier Peak]]
* [[Mount Rainier]]
* [[Mount St. Helens]]
* [[Mount Adams (Washington)|Mount Adams]]
* [[Mount Hood]]
* [[Mount Jefferson (Oregon)|Mount Jefferson]]
* [[Three Sisters (Oregon)|Three Sisters]]
* [[Newberry Volcano]]
* [[Mount Mazama]] (Crater Lake)
* [[Mount McLoughlin]]
* [[Medicine Lake Volcano]]
* [[Mount Shasta]]
* [[Lassen Peak]]
* [[Black Butte (Oregon)|Black Butte]]
* [[Black Butte (Siskiyou County, California)|Black Butte (California)]]
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