The largest subaerial (on-land) landslide in Earth's recorded history was triggered by the catastrophic May 18, 1980, volcanic eruption of Mount St. Helens in Washington State, United States. The colossal lateral blast and slope collapse displaced a massive volume of approximately 2.8 cubic kilometers (0.67 cubic miles) of the mountain's summit and northern flank. The debris avalanche rushed down the slope at blistering speeds ranging from 112 to 240 kilometers per hour, reshaping the regional topography and filling valleys miles away with an immense wall of rock, soil, and glacial ice.
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