Mount St. Helens erupts

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On the morning of May 18, Mount St. Helens was shaken by an earthquake of about 5.0 magnitude, and the entire north side of the summit began to slide down the mountain. The giant landslide of rock and ice, one of the largest recorded in history, was followed and overtaken by an enormous explosion of steam and volcanic gases, which surged northward along the ground at high speed. The lateral blast stripped trees from most hill slopes within six miles of the volcano and leveled nearly all vegetation for as far as 12 miles away. Approximately 10 million trees were felled by the blast.
The landslide debris, liquefied by the violent explosion, surged down the mountain at speeds in excess of 100 miles per hour. The avalanche flooded Spirit Lake and roared down the valley of the Toutle River for a distance of 13 miles, burying the river to an average depth of 150 feet. Mudflows, pyroclastic flows, and floods added to the destruction, destroying roads, bridges, parks, and thousands more acres of forest. Simultaneous with the avalanche, a vertical eruption of gas and ash formed a mushrooming column over the volcano more than 12 miles high. Ash from the eruption fell on Northwest cities and towns like snow and drifted around the globe within two weeks. Fifty-seven people, thousands of animals, and millions of fish were killed by the eruption of Mount St. Helens.