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Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States.

en.wikipedia.org/wiki/Mount_St._Helens

Mount St. Helens or Louwala-Clough is an active stratovolcano located in Skamania County, .... It produced the only unequivocal laterally directed blast known from Mount St. Helens before the 1980 eruptions. During Sugar Bowl time, the ...

volcanoes.usgs.gov/volcanoes/st_helens/st_helens_geo_hist_99.html

Mar 30, 2017 ... Magma began intruding into the Mount St. Helens edifice in the late winter ... Eruptions occurred on average from about 1 per hour in March to ...

volcanoes.usgs.gov/observatories/cvo/Historical/LewisClark/Info/summary_mount_st_helens.shtml

Geologists call Mount St. Helens a composite volcano (or stratovolcano), a term for ... Although Hawaiian-type eruptions may destroy property, they rarely cause ...

pubs.usgs.gov/gip/103

Apr 30, 2010 ... Commemorating the 30th anniversary of the 1980 eruptions of Mount St. Helens.

volcano.si.edu/volcano.cfm?vn=321050

Country; Volcanic Region; Primary Volcano Type; Last Known Eruption ... CVO reported that on 14 February a M 4.3 earthquake near Mount St. Helens, felt ...

www.geology.sdsu.edu/how_volcanoes_work/Sthelens.html

The 1980 eruption of Mt. St. Helens is the most studied volcanic eruption of the ... Mt. St. Helens typically generates explosive pyroclastic eruptions, in contrast to ...

www.cnn.com/2013/07/26/us/mount-st-helens-fast-facts

May 4, 2017 ... Mount St. Helens is a volcano in the state of Washington, seen here in 2004 ... Mount St. Helens has had at least four major explosive eruptions ...

volcano.oregonstate.edu/Mount_St_Helens

Prior to 1980, Mount St. Helens formed a conical, youthful volcano ... Historical eruptions in the 19th century originated from the Goat Rocks area on the north ...

www.livescience.com/27553-mount-st-helens-eruption.html

Feb 28, 2013 ... Mount St. Helens erupted on May 18, 1980. ... There were minor eruptions in 1898, 1903 and 1932, but for most of the 20th century, the ...