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Volcanoes: Mountains
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Volcanoes are mountains that come in various shapes and sizes, some towering tens of thousands of feet high and others just small domes that rise about 100 feet. Unlike other mountains, though, these natural wonders can erupt with powerful and potentially lethal force.
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The Cascade magmatic arc is a belt of Quaternary volcanoes that extends 1,250 km from Lassen Peak in northern California to Meager Mountain in Canada, above the subduction zone where the Juan de Fuca Plate plunges beneath the North American Plate. Newly published Professional Paper 1744, Quaternary Magmatism in the Cascades—Geologic Perspectives by Wes Hildreth, presents a synthesis of the entire volcanic arc, addressing all 2,300 known Quaternary volcanoes. Wes Hildreth’s insightful understanding of volcanic processes and his uncompromising scientific integrity make him uniquely qualified to present this synthesis. During more than three decades of volcanological studies, he has carried out comprehensive investigations of Mount Adams, Mount Baker, the Three Sisters, and the Simcoe Mountains Volcanic Field. He ... brings a broad experience in other volcanic arcs, having conducted integrated field and laboratory investigations at several major volcanic centers in the Andes and the Aleutian arcs. His expertise and perspective have been further enhanced by in-depth petrologic studies of caldera environments, primarily in Long Valley, California, and Yellowstone.
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Active volcanoes in the U.S. are found mainly in Hawaii, Alaska, and the Pacific Northwest. Active volcanoes of the Cascade Mountain Range in California, Oregon, and Washington have created problems recently. The danger area around a volcano covers approximately a 20-mile radius. Some danger may exist 100 miles or more from a volcano, leaving Montana and Wyoming at risk.
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In other instances... the volcanoes are unable to cease whining. They allow inner pressure to blast off large chunks of their sides, just so they can get a little magma to escape. Most volcanoes claim that "the pain on the outside is nothing compared to the pain on the inside" but this is generally accepted as crap. It gets to the point where the mountains have a physical addiction to erupting, and actually continue to do so until they either run out of magma or blow themselves into oblivion.
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When people think of volcanoes, the first image that comes to mind is probably a tall, conical mountain with orange lava spewing out the top. There are certainly many volcanoes of this type. But the term volcano actually describes a much wider range of geological phenomena.
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Subglacial volcanoes develop underneath icecaps. They are made up of flat lava flows atop extensive pillow lavas and palagonite. When the icecap melts, the lavas on the top collapse leaving a flat-topped mountain. Then, the pillow lavas ... collapse, giving an angle of 37.5 degrees
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