Great Sitkin volcano in the Andreanof Islands of the central Aleutians is seen here rising to the NE across Sitkin Sound from Finger Bay on Adak Island. The volcano was constructed within the caldera of an older shield volcano, part of which forms the high snow-covered peak at the right. The 1740-m-high post-caldera cone of Great Sitkin volcano itself contains a small, 0.8 x 1.2 km ice-filled summit caldera, whose rim forms the irregular summit on the left horizon. In 1945, a 400-600-m wide lava dome was emplaced through a glacier filling this caldera. Photo by Fred Zeillemaker, 1982 (U.S. Fish and Wildlife Service, courtesy of Alaska Volcano Observatory).