Q:

How big is Mount St. Helens?

A:

Quick Answer

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.

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Full Answer

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.

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Related Questions

  • Q:

    How many times has Mt. St. Helens erupted?

    A:

    Mount St. Helens has erupted numerous times in its 300,000-year history, most notably on May 18, 1980. While much of its early history remains a mystery, geologic studies have concluded that Mount St. Helens is the most active volcano in the Pacific Northwest.

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  • Q:

    How did Mount St. Helens get its name?

    A:

    The modern name of this volcano was given to it by Captain George Vancouver in 1792. He named it in honor of Alleyne Fitzherbert, who was the British ambassador to Spain. Fitzherbert held the title of Baron St. Helens.

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  • Q:

    When did Mount St. Helens erupt?

    A:

    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.

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  • Q:

    When is Mount St. Helens going to erupt again?

    A:

    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.

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