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- 1980_eruption_of_Mount_St._Helens abstract "In 1980, a major volcanic eruption occurred at Mount St. Helens, a volcano located in state of Washington, in the United States. The eruption (which was a VEI 5 event) was the only significant one to occur in the contiguous 48 U.S. states since the 1915 eruption of Lassen Peak in California. The eruption was preceded by a two-month series of earthquakes and steam-venting episodes, caused by an injection of magma at shallow depth below the volcano that created a huge bulge and a fracture system on the mountain's north slope.Prior to the eruption, USGS scientists convinced local authorities to close Mount St. Helens to the general public and to maintain the closure in spite of local pressure to re-open it; their work saved thousands of lives. An earthquake at 8:32:17 a.m. PDT (UTC−7) on Sunday, May 18, 1980, caused the entire weakened north face to slide away, suddenly exposing the partly molten, gas- and steam-rich rock in the volcano to lower pressure. The rock responded by exploding a hot mix of lava and pulverized older rock toward Spirit Lake so fast that it overtook the avalanching north face.An eruption column rose 80,000 feet (24 km; 15 mi) into the atmosphere and deposited ash in 11 U.S. states. At the same time, snow, ice and several entire glaciers on the volcano melted, forming a series of large lahars (volcanic mudslides) that reached as far as the Columbia River, nearly 50 miles (80 km) to the southwest. Less-severe outbursts continued into the next day, only to be followed by other large, but not as destructive, eruptions later in 1980.Fifty-seven people were killed, including innkeeper Harry R. Truman, photographer Reid Blackburn and geologist David A. Johnston. Hundreds of square miles were reduced to wasteland causing over a billion U.S. dollars in damage ($2.88 billion in 2014 dollars), thousands of game animals were killed, and Mount St. Helens was left with a crater on its north side. At the time of the eruption, the summit of the volcano was owned by the Burlington Northern Railroad, but afterward the land passed to the United States Forest Service. The area was later preserved, as it was, in the Mount St. Helens National Volcanic Monument.".
- 1980_eruption_of_Mount_St._Helens thumbnail MSH80_eruption_mount_st_helens_05-18-80-dramatic-edit.jpg?width=300.
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- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink description_msh_debris_aval.html.
- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink may_18_1980.
- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink framework.html.
- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink MSH_past_present_future.html.
- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink ljt_slideset_old.html.
- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink mount_st_helens_30_years_ago.html.
- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink msh.
- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink index.php?m=xxhelensxx.
- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink vic_msh_fm.html.
- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink mount-saint-helens-volcanic-eruption.
- 1980_eruption_of_Mount_St._Helens wikiPageExternalLink victims.php.
- 1980_eruption_of_Mount_St._Helens wikiPageID "673671".
- 1980_eruption_of_Mount_St._Helens wikiPageRevisionID "606528567".
- 1980_eruption_of_Mount_St._Helens accessdate "2010-12-05".
- 1980_eruption_of_Mount_St._Helens article "Eruptions of Mount St. Helens: Past, Present, and Future".
- 1980_eruption_of_Mount_St._Helens caption "--05-18".
- 1980_eruption_of_Mount_St._Helens date "1980-05-18".
- 1980_eruption_of_Mount_St._Helens date "20070527160122".
- 1980_eruption_of_Mount_St._Helens hasPhotoCollection 1980_eruption_of_Mount_St._Helens.
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- 1980_eruption_of_Mount_St._Helens id "gov.archives.arc.13504".
- 1980_eruption_of_Mount_St._Helens impact "57".
- 1980_eruption_of_Mount_St._Helens location Skamania_County,_Washington.
- 1980_eruption_of_Mount_St._Helens location Washington_(state).
- 1980_eruption_of_Mount_St._Helens map "File:St helens map showing 1980 eruption deposits.png".
- 1980_eruption_of_Mount_St._Helens mapCaption "Map of eruption deposits".
- 1980_eruption_of_Mount_St._Helens name "1980".
- 1980_eruption_of_Mount_St._Helens name "Eruption of Mount St. Helens, 1980".
- 1980_eruption_of_Mount_St._Helens name "This place in time: The Mount St. Helens story".
- 1980_eruption_of_Mount_St._Helens photo "File:MSH80 eruption mount st helens 05-18-80-dramatic-edit.jpg".
- 1980_eruption_of_Mount_St._Helens photoSize "200".
- 1980_eruption_of_Mount_St._Helens time "8.32".
- 1980_eruption_of_Mount_St._Helens title "--05-18".
- 1980_eruption_of_Mount_St._Helens title "List of victims".
- 1980_eruption_of_Mount_St._Helens type Peléan_eruption.
- 1980_eruption_of_Mount_St._Helens type Plinian_eruption.
- 1980_eruption_of_Mount_St._Helens url MSH_past_present_future.html.
- 1980_eruption_of_Mount_St._Helens url vic_msh_fm.html.
- 1980_eruption_of_Mount_St._Helens vei "5".
- 1980_eruption_of_Mount_St._Helens volcano Mount_St._Helens.
- 1980_eruption_of_Mount_St._Helens subject Category:1980_in_Idaho.
- 1980_eruption_of_Mount_St._Helens subject Category:1980_in_Montana.
- 1980_eruption_of_Mount_St._Helens subject Category:1980_in_Oregon.
- 1980_eruption_of_Mount_St._Helens subject Category:1980_in_Washington_(state).
- 1980_eruption_of_Mount_St._Helens subject Category:1980_natural_disasters.
- 1980_eruption_of_Mount_St._Helens subject Category:20th-century_volcanic_events.
- 1980_eruption_of_Mount_St._Helens subject Category:Cascade_Volcanoes.
- 1980_eruption_of_Mount_St._Helens subject Category:Gifford_Pinchot_National_Forest.
- 1980_eruption_of_Mount_St._Helens subject Category:History_of_Idaho.
- 1980_eruption_of_Mount_St._Helens subject Category:History_of_Washington_(state).
- 1980_eruption_of_Mount_St._Helens subject Category:History_of_the_United_States_(1980–91).
- 1980_eruption_of_Mount_St._Helens subject Category:Mount_St._Helens.
- 1980_eruption_of_Mount_St._Helens subject Category:Natural_disasters_in_Washington_(state).
- 1980_eruption_of_Mount_St._Helens subject Category:VEI-5_volcanoes.
- 1980_eruption_of_Mount_St._Helens subject Category:Volcanism_of_Washington_(state).
- 1980_eruption_of_Mount_St._Helens point "46.20027777777778 -122.18666666666667".
- 1980_eruption_of_Mount_St._Helens type Disease.
- 1980_eruption_of_Mount_St._Helens type Situation.
- 1980_eruption_of_Mount_St._Helens type SpatialThing.
- 1980_eruption_of_Mount_St._Helens comment "In 1980, a major volcanic eruption occurred at Mount St. Helens, a volcano located in state of Washington, in the United States. The eruption (which was a VEI 5 event) was the only significant one to occur in the contiguous 48 U.S. states since the 1915 eruption of Lassen Peak in California.".
- 1980_eruption_of_Mount_St._Helens label "1980 eruption of Mount St. Helens".
- 1980_eruption_of_Mount_St._Helens label "1980年圣海伦火山爆发".
- 1980_eruption_of_Mount_St._Helens label "Ausbruch des Mount St. Helens 1980".
- 1980_eruption_of_Mount_St._Helens label "Erupción del Monte Santa Helena en 1980".
- 1980_eruption_of_Mount_St._Helens label "Erupção do Monte Santa Helena de 1980".
- 1980_eruption_of_Mount_St._Helens label "Eruzione del Mount St. Helens del 1980".
- 1980_eruption_of_Mount_St._Helens label "Éruption du mont Saint Helens en 1980".
- 1980_eruption_of_Mount_St._Helens label "Извержение Сент-Хеленс 1980 года".
- 1980_eruption_of_Mount_St._Helens sameAs Ausbruch_des_Mount_St._Helens_1980.
- 1980_eruption_of_Mount_St._Helens sameAs Erupción_del_Monte_Santa_Helena_en_1980.
- 1980_eruption_of_Mount_St._Helens sameAs Éruption_du_mont_Saint_Helens_en_1980.
- 1980_eruption_of_Mount_St._Helens sameAs Eruzione_del_Mount_St._Helens_del_1980.
- 1980_eruption_of_Mount_St._Helens sameAs Erupção_do_Monte_Santa_Helena_de_1980.
- 1980_eruption_of_Mount_St._Helens sameAs m.031t8g.
- 1980_eruption_of_Mount_St._Helens sameAs Q778218.
- 1980_eruption_of_Mount_St._Helens sameAs Q778218.
- 1980_eruption_of_Mount_St._Helens lat "46.20027777777778".
- 1980_eruption_of_Mount_St._Helens long "-122.18666666666667".
- 1980_eruption_of_Mount_St._Helens wasDerivedFrom 1980_eruption_of_Mount_St._Helens?oldid=606528567.
- 1980_eruption_of_Mount_St._Helens depiction MSH80_eruption_mount_st_helens_05-18-80-dramatic-edit.jpg.
- 1980_eruption_of_Mount_St._Helens isPrimaryTopicOf 1980_eruption_of_Mount_St._Helens.