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Mount St. Helens is an active volcano in the Cascade Range, according to the U.S. Geological Survey. It erupted in 1980 after a 5.1-magnitude earthquake shook the area. It is about 75 miles ...
The 2023 South Coldwater Slide is a mudslide that occurred in May 2023 near Mt. St. Helens. The volume of debris, and subsequent destruction of a bridge, closed off Washington State Route 504 and access to the Mount St. Helens National Volcanic Monument .
Mount St. Helens showed significant activity on March 8, 2005, when a 36,000-foot (11,000 m) plume of steam and ash emerged—visible from Seattle. [43] This relatively minor eruption was a release of pressure consistent with ongoing dome building. The release was accompanied by a magnitude 2.5 earthquake.
Downed tree in the 1980 blast zone of Mt. St. Helens. Spirit Lake and Mt. St. Helens in the background, Washington. (Photo by: Marli Miller/UCG/Universal Images Group via Getty Images) (Getty Images)
Mount St. Helens, once the fifth-tallest peak in Washington State, lost about 1,300 feet from its height of 9,677, according to the USGS. The highest part of the crater rim on the southwestern ...
Johnston going into the Mount St. Helens crater to sample the lake. Photographed on April 30, 1980. Johnston sampling the lake. Since its last eruptive activity in 1857, Mount St. Helens had been largely dormant. Seismographs were not installed until 1972. This period of 123 years of inactivity ended in early 1980.
The 2004–2008 volcanic activity of Mount St. Helens has been documented as a continuous eruption with a gradual extrusion of magma at the Mount St. Helens volcano. Starting in October 2004, a gradual building of a new lava dome happened.
More than 400 earthquakes have been detected beneath Washington's Mount St. Helens in recent months, though there are no signs of an imminent eruption, according to the U.S. Geological Survey.