Guide to Geologic Hazards in Alaska - Glossary

Lahar
A mudflow composed chiefly of volcaniclastic materials on the flank of a volcano. The debris carried in the flow includes pyroclasts, blocks from primary lava flows, and epiclastic material. Syn: mudflow (Neuendorf, K.K.E. and others, 2005)
Hot volcanic debris erupted onto the flanks of the volcano can melt snow, forming floods or fast-moving slurries of water, mud, rocks, and sand. Lahars may also occur when thick deposits of proximal ash are rapidly eroded by heavy rainfall following eruptions. http://doi.org/10.14509/7042" href="/pubs/id/7042">(RI 2004-3)
  • DGGS online catalog of government agency publications relating to: Lahar
  • U.S. Geological Survey Laboratory,U.S. Geological Survey (USGS): Volcano hazards program
  • U.S. Geological Survey Branch of Analytical Chemistry,U.S. Geological Survey (USGS): Volcano hazards program
  • Alaska Volcano Observatory (AVO): Homepage
  • U.S. Geological Survey (National Cooperative Geologic Mapping Program),U.S. Geological Survey (USGS): Volcano hazards program
  • U.S. Geological Survey, Office of Earthquakes,U.S. Geological Survey (USGS): Volcano hazards program