Mountain explodes in Pacific Northwest

Mountain explodes in Pacific Northwest
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Highlights

The biggest landslide in recorded history follows a magnitude 5.1 earthquake as the north face of Washington’s Mount St. Helens falls away in a volcanic eruption.

May 18, 1980: The biggest landslide in recorded history follows a magnitude 5.1 earthquake as the north face of Washington’s Mount St. Helens falls away in a volcanic eruption. The sideways blast of lava and rock devastates a 230- square-mile area, and ash clouds that rise 16 miles will fall over 11 states.

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