The Mountain That Blew Its Top

In 1980, Washington's Mount St. Helens literally lost its peak. A massive side-blast caused the largest landslide in recorded history, instantly erasing 1,300 feet of mountain height.

This catastrophic eruption was triggered by a magnitude 5.1 earthquake that caused the volcano's unstable north face to collapse. The resulting debris avalanche traveled at incredible speeds, flattening over 200 square miles of forest in minutes. It remains the deadliest and most economically destructive volcanic event in American history. Even today, the giant horseshoe-shaped crater serves as a stark reminder of how quickly a landscape can be transformed.