When did Mount Saint Helens erupt?
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Q:

When did Mount Saint Helens erupt?

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Quick Answer

Mount St. Helens' most significant eruption in modern times occurred on March 20, 1980. It was followed by additional eruptions between Dec. 7, 1989 to Jan. 6, 1990, Nov. 5, 1990 to Feb. 14, 1991, Oct.11, 2004, Mar. 8, 2005, and between Jan. 16, 2008 to July 10, 2008.

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Full Answer

Prior to the 1980 eruption, recorded eruptions from 19th century include a major eruption in 1800, followed by smaller eruptions between 1831 to 1857. During that time, the largest eruption occurred in 1842. Other major eruptions date to 1480, 400 B.C., 1200 B.C., 1600 B.C., 1900 B.C. and 2500 B.C. It experienced a 2,000-year eruptive period beginning 20,000 years ago and another eruptive period that ended about 35,000 years ago.

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Related Questions

  • Q:

    What effect did Mount St. Helens have?

    A:

    The eruption of Mount St. Helens at 8:32 on May 18, 1980 was a major geological event that continues to have many effects on the 150 square miles surrounding the volcano. This eruption is classified as the worst volcanic disaster in United States history. In this explosion, the mountain lost its conical tip and 1,300 feet in elevation. Fifty-seven people and hundreds of animals lost their lives.

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  • Q:

    What damage did Mount St. Helens cause?

    A:

    The eruption of Mount St. Helens on May 18, 1980, caused the destruction of 27 bridges, over 200 homes and 4.7 billion boards of timber. In addition, 15 miles of railway and 185 miles of highway were damaged or destroyed. Fifty-seven people also lost their lives during the eruption, and another four deaths occurred as an indirect result of the eruption.

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  • Q:

    What type of lava was produced in the most recent Mount St. Helens eruption?

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    The most recent volcanic eruption of Mount St. Helens in Washington State, which began in October, 2004, produced hot, but solid, extrusions of smooth-sided lava called "spines." The extrusion of the solid lava spines continued until January 2008, producing more than 120 million cubic yards of solidified lava. Unlike the previous and catastrophic eruption, which occurred in 1980 and produced thick lava flows, the eruptions occurring between 2004 and 2008 produced only solid lava extrusions and resulted in no loss of life or property.

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  • Q:

    How many people died when Mount Saint Helens erupted?

    A:

    As a result of the 1980 eruption of Mount St. Helens, 57 people died. Earthquakes started on March 15, gradually building into small eruptions and then culminating in the massive eruption of May 18.

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