Global Volcanism Program | Image GVP-08562
Great Sitkin in the Andreanof Islands is seen here from Finger Bay on Adak Island. The volcano was constructed within the caldera of an older edifice, part of which forms the high snow-covered peak to the right. The post-caldera cone contains a small, 0.8 x 1.2 km ice-filled summit caldera. The rim forms the irregular summit on the left horizon. In 1945 a lava dome400-600 m wide was emplaced through a glacier filling the caldera.
Photo by Fred Zeillemaker, 1982 (U.S. Fish and Wildlife Service, courtesy of Alaska Volcano Observatory).