Today in History: May 18
At 8:32:17 a.m. PDT on May 18, 1980, an earthquake took place directly under Mount St. Helens, the only non-dormant volcano in the lower 48 states. It shook off the entire north face of the mountain. This was and remains the largest landslide in recorded history.
As the top of the mountain slid off, the molten rock and steam inside the volcano was exposed to cooler air; when this happened, the mountain exploded and a column of ash rose 80,000 feet in the air (about 15 miles) and mudslides reached 50 miles away. Because the volcano had started to become seismically active about two months before, a vast area around the mountain had been evacuated. Fifty-seven people perished nonetheless.
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