Volcano Hazards - 9 of 8
Volcano Hazards FAQs - 8 Found
Lahars are commonly initiated by:
- Large landslides of water-saturated debris
- Heavy rainfall eroding volcanic deposits
- Sudden melting of snow and ice near a volcanic vent by radiant heat or on the flanks of a volcano by pyroclastic flows
- Breakout of water from glaciers, crater lakes, or from lakes dammed by volcanic eruptions
Since 1980, lahars have formed by all of these processes at Mount St. Helens. -- From: Brantley and Power, 1985, Reports from the U.S. Geological Survey's Cascades Volcano Observatory at Vancouver, Washington: Earthquake Information Bulletin, v.17, n.1, January-February 1985.