Global Volcanism Program | Image GVP-05323
Geologists walk toward Griggs volcano from the base of Knife Creek Glacier to its south. Active fumarole fields persist in the summit crater and along the upper SW flank, and can be heard from the valley floor. The flanks of Griggs and the surface of Knife Creek Glacier have thick ash deposits from the 1912 Novarupta eruption.
Photo by Game McGimsey (Alaska Volcano Observatory, U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.