On the morning of May 18, 1980, an earthquake shook the volcanic Mount St. Helens in southwestern Washington, triggering a gigantic landslide of ice and rock followed by a violent explosion of steam and gases. The eruption killed 57 people, thousands of animals and millions of fish. Over 200 square miles of wilderness were devastated. In 1982 President Ronald Reagan established the area around the peak as the Mount St. Helens National Volcanic Monument.