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en.wikipedia.org/wiki/Mount_St._Helens

The volcano is located in the Cascade Range and is part of the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire that includes over 160 active volcanoes. This volcano is well known for its ash explosions and pyroclastic flows . Mount St. Helens is most notorious for its major 1980 eruption, the deadliest and most ...

en.wikipedia.org/wiki/1980_eruption_of_Mount_St._Helens

On May 18, 1980, a major volcanic eruption occurred at Mount St. Helens, a volcano located in Skamania County, in the state of Washington, United States. The eruption (a VEI 5 event) was the most significant volcanic eruption to occur in the contiguous 48 U.S. states since the 1915 eruption of Lassen Peak in California.

abcnews.go.com/US/decades-catastrophic-1980-eruption-mount-st-helens-recharging/story?id=47461548

May 18, 2017 ... "This is why we maintain a close watch over these giants, so we can detect the earliest signs of reawakening," she said. The agency sends out weekly updates on seismic activity around the volcano. Mount St. Helens' last eruption in 2008 was insignificant compared with the devastating eruption in 1980.

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

Mar 30, 2017 ... On March 16, 1980, the first sign of activity at Mount St. Helens occurred as a series of small earthquakes. On March 27, after hundreds of additional earthquakes, the volcano produced its first eruption in over 100 years. Steam explosions blasted a 60- to 75-m (200- to 250-ft) wide crater through the ...

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

May 4, 2017 ... View the Mount St. Helens Fast Facts on CNN and learn more about the volcano in Washington. ... It erupted in 1980, spewing out more than 1 cubic kilometer of material. Scientists ... Over the last 500 years, Mount St. Helens has had at least four major explosive eruptions and many minor eruptions. Mount ...

www.mountsthelens.com/history-1.html

The history of Mt. St. Helens eruption and erupting periods including native american history and historical accounts of the volcano. ... Ancestral Mount St. Helens began to grow before the last major glaciation of the Ice Age had ended about 10,000 .... At 7 a.m. Pacific Daylight Time (PDT), USGS volcanologist David A.

www.sciencealert.com/nearly-40-years-after-mount-st-helens-deadly-eruption-it-s-recharging

May 20, 2017 ... It's been 37 years as of last Thursday since the Mount St. Helens volcano in the US state of Washington exploded, taking 57 lives and destroying hundreds of square kilometres of forest, bridges, and homes. The US Geological Survey ( USGS) has been keeping an eye on the volcano's activity ever since, ...

volcano.oregonstate.edu/what-were-effects-people-when-mt-st-helens-erupted

For a limited time, some people living near the eruption suffered from post traumatic stress syndrome: depression, troubled sleep, irritability, ans a sense of powerlessness. From 1980-1990, 74 research projects were funded by the National Science Foundation at a total cost of just less than $5 million. The Mount St. Helens ...

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

Feb 28, 2013 ... Mount St. Helens erupted on May 18, 1980. ... The volcano was relatively active in the early 19th century, and may have had a major explosive eruption in 1800, according to the Mount St. Helens Forest Learning Center. ... It was his last transmission; the ridge he camped on was within the direct blast zone.