Mount St. Helens, an active stratovolcano, has an elevation of 8,363 feet. It is located in Skamania County, Wash., in the Pacific Northwest region of the United States.Continue Reading
From March 16 to May 17, 1980, Mount St. Helens experienced a series of small earthquakes, which culminated in a catastrophic eruption on May 18. At the time, it was the deadliest and most economically destructive volcanic event in the history of the United States.
The eruption impacted the size of the mountain, creating a crater 1.2 miles across east to west, 1.8 miles across north to south, and 2,084 feet deep. Prior to the eruption, it stood at 9,677 feet in elevation; it lost 1,314 feet in the eruption. The mountain lost a volume of 0.67 cubic miles.Learn more about The West
Mount St. Helens is a cinder cone volcano that formed through the gradual accumulation of cinders and ash at the base of the mountain. Unlike a shield volcano, such as Mauna Loa in Hawaii, cinder cones can rise sharply from the surrounding terrain and maintain a steep, angular profile throughout their existence.Full Answer >
While it is not yet possible to predict volcanic eruptions decades in advance, the U.S. Geological Survey’s Cascades Volcano Observatory continually monitors Mount St. Helens to gather data for more accurate short-term predictive models. According to “Future Eruptions at Mount St. Helens,” this volcano is the most likely to erupt in the Cascade Mountains of Washington again in the coming decades.Full Answer >
Bring all the equipment otherwise required for hiking or camping in a mountainous area with rapidly changing weather when visiting Mount St. Helens. It is also necessary to have a special hiking permit that allows climbing above 4,800 feet. These permits are required throughout the year and are issued on a first-come, first-served basis.Full Answer >
The largest eruption of Mount St. Helens in recent history occurred on May 18, 1980, when a cataclysmic eruption removed most of the northern face of the mountain. At 8:32 a.m. PDT, the summit collapsed into a rock debris avalanche that released a lateral gas explosion.Full Answer >