Global Volcanism Program | Image GVP-03256
The sparsely vegetated Devastated Zone on the NE flank of Lassen Peak was swept by a pyroclastic surge on May 22, 1915, during the paroxysmal phase of the 1914-1917 eruption. The pyroclastic surge destroyed forests, and was accompanied by mudflows that traveled down Lost Creek and Hat Creek valleys.
Photo by Lyn Topinka, 1984 (U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.