Global Volcanism Program | Image GVP-04544
Akutan summit contains a 2-km-wide caldera that with a large scoria cone that rises above the caldera rim. It is seen here from the south in eruption on 11 February 1987. A small lake occupies part of the caldera floor. The caldera rim is breached narrowly on the north side. A lava flow in 1978 traveled through this gap to within 2 km of the sea.
Photo by Jerry Chisum (Mark Airways), 1987 (courtesy of John Reeder, Alaska Div. Geology & Geophysical Surveys).