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Mount Saint Helens

Emma Kilgore, Levi Boger, & Haley Link

Haley Link

on 5 October 2012

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Transcript of Mount Saint Helens

Levi Boger, Emma Kilgore, Haley Link. Mt. St. Helens Facts Facts Cont. Located in the Casade Range Effects of the 1980 Eruption Mount St. Helen's is most well known catastrophic eruption on May 18, 1980 at 8:32am Pacific Daylight time. Effects Continued.. An eruption column rose 80,000 feet into the air and deposited ash in 11 U.S States Fun Facts! Mount St. Helen's has erupted 38 times including the 1980 eruption. If you count all the little eruptions, there are 45 or more. 8,366 Feet Last Eruption: July 10, 2008 Mount St. Helen's is an active Composite Cone located in Skamania, Washington. Mt. St. Helens got it's name from from the British diplomat Lord St. Helen's, a friend of explorer George Vancouver who made a survey of the area in late 18th Century. This was the deadliest and most economically destructive volcanic event in the history of the United States. 57 people were killed, 250 homes, 47 bridges, 15 miles of railways, and 185 miles of highway were destroyed in this event. A massive debris avalanche triggered by an earthquake measuring 5.1 on the Richter scale, caused an eruption, reducing the elevation from 9,677 feet to 8,365 feet and replacing it with a 1 mile wide horseshoe-shaped crater. The resulting release of pressure from within the volcano released a plume of ash and pumice (A type of volcanic rock) At the same time snow, ice, and several entire glaciers on the volcano melted. Less severe outbursts continued into the next day only to be followed by other large but not as destructive eruptions later in 1980. http://wiki.answers.com/Q/How_many_times_has_mount_St_helens_erupted Work Cited http://en.wikipedia.org/wiki/1980_eruption_of_Mount_St._Helens During the 2004 to 2008 eruptions—
Mount St. Helens settled one half inch
due to magma withdrawal beneath the volcano. March 20, 1980—A magnitude 4.2
earthquake signaled the reawakening
of the volcano after 123 years. http://pubs.usgs.gov/gip/103/ Before & After the Eruption http://www.daviddarling.info/images/Mount_St_Helens_before_and_after.jpg During the eruption http://www.universetoday.com/wp-content/uploads/2010/01/JLM-NatGeo-Mount-St-Helens-1980-May-18.jpg
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