rockfall avalanche

rockfall avalanche
   The mass movement process, associated sediments (rockfall avalanche deposit), or resultant landform characterized by an extremely rapid, large type of flow (a type of landslide) that starts as a rockfall but turns into a flow and characteristically deposits rock-dominated debris long distances from the failure face (such as 10-20 times the fall height); occurs only when huge rockfalls and rockslides involving millions of metric tons of material attain extremely rapid speeds; most common in a rugged mountainous area; ex. the 1903 Franks, Alberta, Canada avalanche. Sometimes loosely referred to as a long run-out landslide.
   Compare: debris flow, flow, landslide.
   SW

Glossary of landform and geologic terms. 2013.

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