Boulders partially bury a house from a debris flow triggered by rapid snow melt in late May, 1983. The rapidly-moving debris flow emerged from a canyon and killed one person, injured several others, destroyed or severely damaged five homes, and buried a highway.
Image Credit: U.S. Geological Survey
Mudflows and Earthflows
The slopes above streams and rivers are subjected to a variety of processes that cause them to recede and retreat from the river or stream channel. These processes, collectively called mass wasting, can be classified according to rapidity of movement and according to the type of materials that are transported.