Chaos Jumbles, a debris avalanche-deposit formed by collapse of Chaos Crags about 1650 CE, is seen from the top of the avalanche scarp. The avalanche traveled up to 5 km in three lobes now covered with varying degrees of vegetation. The avalanche was emplaced as a cold rockfall avalanche; there is no direct evidence for an associated explosive eruption.

Photo by Lee Siebert, 1982 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Lassen Volcanic Center