Global Volcanism Program | Image GVP-05212
Crater Peak, a flank vent of Mount Spur, is seen from the south with the snow-and-ice-covered summit lava dome complex of Spurr in the background. Both the summit lava dome and Crater Peak were constructed within a 5-6 km wide caldera formed by collapse of the edifice of an ancestral Spurr. Crater Peak has been the source of about 40 Holocene tephra layers identified in the Cook Inlet basin.
Photo by Game McGimsey, 1991 (Alaska Volcano Observatory, U.S. Geological Survey).