This 1974 view shows part of the interior of Fisher caldera on Unimak Island in the eastern Aleutian Islands. Fisher is an 11 x 18 km caldera that formed about 9,100 years ago during the eruption of pyroclastic flows that overtopped topographic barriers more than 500 m high. The caldera contains several lakes, maars, and other vents.

Photo by Tom Miller, 1974 (Alaska Volcano Observatory, U.S. Geological Survey).

This image is made available as a Public Domain Work, but proper attribution is appreciated.

Keywords: caldera

Fisher