Mount St. Helens in Washington, about 55 miles northeast of Portland, Oregon, and 95 miles south of Seattle.
Over the past five hundred years, Mount Saint Helens has experienced at least four major eruptions and many smaller eruptions.
Mount Saint Helens was named by Commander George Vancouver for British diplomat Allen Fitzherbert, whose nickname was Baron Saint Helens.
1792-1794 – The mountain was named while Commander Vancouver surveyed the North Pacific coast.
It was first identified as a file volcano
1857-1980 – Inactive.
May 18, 1980 – Explodes.
57 people were killed. Damage caused by explosion costs $1.1 billion
Hot ash causes forest fires. Snow melting from the top of the mountain causes flooding.
Volcanic ash spreads across the northwest. More than 900,000 tons of ash are being cleaned from areas around Washington.
1980-1986 – Many small eruptions occur.
September 2004 – Several days of unusual seismic activity led seismologists to believe that an eruption caused by a buildup of steam was likely to occur.
March 8, 2005 – It shoots out a plume of smoke and ash nearly six miles high, leaving a visible plume of more than 50 miles.
January 2008 –
bangs that have constantly happened
Since October 2004 it has stopped.
July 2014 –
Final preparations begin for what the geophysicists call The equivalent of an ultrasound and a CT scan combined
Inside the volcano. The joint project of scientists at Rice University, University of Washington, University of Texas at El Paso and others involves placing 3,500 seismic sensors around the volcano. The project will take four years and aims to improve volcanic monitoring and pre-warning systems.
3 November 2015 –
Scientists are investigating the interior of a volcano Presenting the first results
At the Congress of the Geological Society of America, saying that there is not only a magma chamber directly under Mount St. Helens, but other chambers east of the mountain that seem to be connected together and magma flows between them.
October 2018 –
Mattresses No. 2 on USGS report
One of the most dangerous volcanoes in the United States. It is considered a volcano ‘Very big risk’
Based on the risks to people and infrastructure.