What type of volcano is mt. st. helen

what type of volcano is mt. st. helen

Mount St. Helens Facts & Worksheets

Mount St. Helens is primarily an explosive dacite volcano with a complex magmatic system. The volcano was formed during four eruptive stages beginning about , years ago and has been the most active volcano in the Cascade Range during the Holocene. Prior to about 12, years ago, tephra, lava domes, and pyroclasticflows were erupted, forming the older St. Helens edifice, but a few lava . Mount St. Helens, Washington USA: Facts | Story | Feature | Questions: Location: State of Washington, USA Latitude and Longitude: ? N, ? W, Elevation: 2, m (8, ft) Volcano Type: Stratovolcano Earliest Eruption: 10, BP Oldest Historic Eruption: Most Recent Eruption: Number of Eruptions in 20th Century: 5.

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By Disaster Report April what time does the new moon set, Q: What type of volcano is Mount St. A: Mount St. Helens is a composite volcano or Stratovolcano. According to the United States Geological Survey USGSthe composite volcanoes are built of layers of alternating lava flow, ash and blocks of unmelted stone.

Mount St. Helens is located around 80 km northeast vo,cano Portland, Oregon and km south of Seattle, Washington. Over the last years, Mount St. Helens has had at least four major explosive eruptions and many minor eruptions. InMount St. Helens released a column of smoke and ash nearly six miles high. Mount Saint Helens had its major eruption on May 18,becoming one of the greatest volcanic explosions ever recorded in North America.

At least 57 people were killed during Mount St. Helens volcanic eruptions. In OctoerMount St. Helens was ranked as no. Labels natural disaster quiz Volcano. Labels: natural disaster quiz Volcano. Post a Comment Your feedback is important to us!

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Over its rich and complex ,year history, Mount St. Helens has produced both violent explosive eruptions of volcanic tephra and relatively quiet outpourings of lava. In the beginning stages of eruptive activity, the volcano mostly consisted of a cluster of domes that was surrounded by an apron of tephra and debris fans of fragmented volcanic rocks. Mount St. Helens. Prior to , Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the eruption the upper m of the summit was removed by slope failure, leaving a 2 x km horseshoe-shaped crater now partially filled by a lava dome. Mount St. Helens was formed during nine eruptive periods beginning about , years ago and has . Apr 24,  · Q: What type of volcano is Mount St. Helens? A: Mount St. Helens is a composite volcano (or Stratovolcano). According to the United States Geological Survey (USGS), the composite volcanoes are built of layers of alternating lava flow, ash and blocks of unmelted stone.

Its eruption on May 18, , was one of the greatest volcanic explosions ever recorded in North America. Mount St. Helens, named by the English navigator George Vancouver for a British ambassador, had been dormant since An explosive steam eruption on March 27, , was followed by alternating periods of quiescence and minor eruption. Pressure from rising magma within the volcano caused extensive fissures and the growth of a bulge on the north flank of the peak.

On the morning of May 18, an earthquake with a magnitude of 5. The avalanche and lateral blast were followed by mudflows, pyroclastic flows, and floods that buried the river valleys around Mount St. Helens in deep layers of mud and debris as far as 17 miles 27 km away. Meanwhile, simultaneously with the blast, a vertical eruption of gas and ash formed a column some 16 miles 26 km high that produced ash falls as far east as central Montana. Complete darkness occurred in Spokane , Washington, about miles km northeast of the volcano.

A total of 57 people and thousands of animals were killed in the May 18 event, and trees over an area of some square miles square km were blown down by the lateral air blast. Further eruptions occurred until , and a dome of lava grew intermittently in the crater. Seismic activity occurred again between and including some small explosions as well as in and In , square miles square km of land surrounding the volcano was designated Mount St.

Helens National Volcanic Monument , administered by the U. The monument provides a unique opportunity for scientific study of the dynamics of an active composite volcano and for research on how ecosystems respond to cataclysmic disturbances. The monument also presents many recreational and educational opportunities. The west side also provides opportunities to observe animals and plants that have recolonized the blast zone and lakes that have formed as a result of the eruption.

The edge of the blast zone, marked by standing dead trees, lies in the eastern part of the monument where old-growth forests, undamaged by the blast, still stand. On the south side are lava formations of various ages, including the longest continuous lava tube in the 48 conterminous U.

Mount Rainier National Park is to the northeast. Mount Saint Helens. Videos Images. Additional Info. More About Contributors Article History. Print Cite verified Cite. While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions. Facebook Twitter. Give Feedback External Websites. Let us know if you have suggestions to improve this article requires login. External Websites.

Helens Eruption. Articles from Britannica Encyclopedias for elementary and high school students. The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree See Article History. The north face of Mount St. Helens in June Eruption of Mount St. Helens on May 18, The lava dome of Mount St.

Helens in May Britannica Quiz. All About Mountains Quiz. What is the highest mountain range in South America? In which country are the Southern Alps located? Lace your climbing boots tight, because this quiz will test whether you can conquer the highest peaks of knowledge.

Witness the volcanic eruption of Mount Saint Helens and subsequent flooding wrought by melted glaciers. On May 18, , as geologists watched in awe, Mount Saint Helens erupted in a gigantic explosion. Statue of a man planting trees, dedicated to those who replanted the area around Mount Saint Helens, Wash.

Get a Britannica Premium subscription and gain access to exclusive content. Subscribe Now. Learn More in these related Britannica articles:. Helens in the state of Washington in Most of the other high Cascade volcanoes exhibit some sign of seismic activity. The Mount St. For example, the eruptions of Mount St.

Helens from to followed a sequence of small Vulcanian-type explosions, large Pelean and Plinian explosions, and finally extrusions of viscous lava into a lava dome that capped the vent. The different types of volcanic activity can best be understood by making…. History at your fingertips. Sign up here to see what happened On This Day , every day in your inbox! Email address.

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