Mount St. Helens, Washington

• General Information
• Regional History
• Previous Eruptive History
• Geologic Section of Tephra Deposits
• The Ashfall of the May 18, 1980 Eruption
• Images from the May 18, 1980 Eruption
• Summary of the May 18, 1980 Eruption
• Impact of the May 18, 1980 Eruption
• Economic Impact of the May 18, 1980 Eruption
• Summary of Eruptions Since May 18, 1980
• Post Eruption Images
• More Post Eruption Images
• 1995 Hazard Zonation for Volcanic Tephra