Magma rising in Washington state's Mount St. Helens volcano: USGS
SEATTLE
Visitors to the Coldwater Ridge Center look up at Mount St. Helens venting steam October 11, 2004.
Credit: Reuters/Andy Clark
(Reuters) - Magma levels are slowly rebuilding inside Mount St. Helens, a volcano in Washington state that erupted in 1980 and killed 57 people, although there was no sign of an impending eruption, U.S. scientists said.
The roughly 8,300-foot volcano erupted in an explosion of hot ash and gas on May 18, 1980, spewing debris over some 230 square miles and causing more than a billion dollars in property damage. Entire forests were crushed and river systems altered in the blast, which began with a 5.2 magnitude earthquake.
"The magma reservoir beneath Mount St. Helens has been slowly re-pressurizing since 2008," the U.S. Geological Survey said in a statement on Wednesday. "It is likely that re-pressurization is caused by (the) arrival of a small amount of additional magma 4 to 8 km (2.5 to 5 miles) beneath the surface."
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Mount St. Helens erupting March 18th, 1980 by U.S. government
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U.S. Geological Survey scientist examines pumice blocks at the edge of a pyroclastic flow from the May 18, 1980 eruption. by United States Geological Survey - Donald A. Swanson
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Mount Saint Helens, State of Washington, United-States 7 September 2004 by Tjk - Flickr
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Crater / Plume image Mount St. Helens. United States Geological Survey photograph taken at 12:13:01 PDT (19:13:01 GMT) on October 1, 2004, by John Pallister
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Mount St. Helens volcano, Washington, USA. June 7th, 2012 by Brigitte Werner (werner22brigitte)
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A panorama of Mount St. Helens Decenber 18th ,2013 by Eviatar Bach
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