Volcano Research

Volcano Research - Helens I found some additional facts...

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Ryan Zmolek Geology 20 Bonus Assignment #2 Volcano Research Mount Saint Helens Mount St . Helens is a stratovolcano, which is located in Washington. Mount St . Helens’ tectonic setting is composed of a Cascadian subduction zone. Mount St . Helens had precursory activity from March 20-May 18 1990. The climactic eruption occurred on May 18 1990 and post-climactic activity is still occurring today. A volcanic ash column raised high into the atmosphere and deposited ash in eleven U.S. states. By the time the ash settled, 57 people and thousands of animals were dead. Mount St . Helens erupted with explosive force, because the magma is too stiff to allow easy escape of volcanic gases. As a consequence, tremendous internal pressures mount as the trapped gases expand during ascent, before the pent-up pressure is suddenly released in a violent eruption. The magma type is high viscosity, high volatiles, and large volume. The Cascades Volcano Observatory is responsible for monitoring Mount Saint
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Unformatted text preview: Helens. I found some additional facts which I found interesting about Mount St . Helens. Mount St . Helens is the most active out of all the cascades volcanoes. The lateral blast swept out of the north side of MSH at 300 miles per hour creating a 230 square mile fan shaped area of devastation reaching a distance of 17 miles from the crater. With temperatures as high as 660 degrees F and the power of 24 megatons of thermal energy, it snapped 100 year old trees like toothpicks and stripped them of their bark. The snow on Mount Saint Helens was not instantly flashed to steam by the heat. The snow was melted and formed large mudflows that destroyed 27 bridges, 200 homes, 185 miles of roadway, and 15 miles of railway. Sites Used http://www.wcu.edu/as/GeosciencesNRM/Geology/cherylwt/L07EarthStr&Tect-140H.pdf http://www.meteo.mcgill.ca/195-250/2008/html/volcanoes/img59.html...
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This note was uploaded on 03/07/2009 for the course GEOL 20 taught by Professor Steidl during the Winter '08 term at UCSB.

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Volcano Research - Helens I found some additional facts...

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