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A MOMENT IN HISTORY

1980 eruption of Mount St. Helens

1980 CE · United States, North America · Disaster

1980 eruption of Mount St. Helens
Image via Wikimedia Commons

On May 18, 1980, at 8:32 a. m. , Mount St. Helens in Skamania County, Washington, United States, experienced a catastrophic explosive eruption which had a volcanic explosivity index of 5. It was the first to occur in the contiguous United States since the much smaller 1915 eruption of Lassen Peak in California.

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