May 18, 2020 /Posted in Blog /By Mark Murray The Eruption of Mount St. Helens in 1980 On May 18, 1980, an earthquake struck below the north face of Mount St. Helens in Washington State, triggering the largest landslide in recorded history, and a major volcanic eruption that scattered ash across a dozen states. Source: The Eruption of Mount St. Helens in 1980.
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