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View of part of the interior of Fisher caldera on Unimak Island in the eastern Aleutian Islands. Fisher is an 11x18 km (7x11 mi) caldera that formed about 9,100 years ago producing compositionally zoned ash flows that overtopped topographic barriers more than 500 m (1,640 ft) in elevation. There was one poorly documented historical eruption from Fisher caldera in 1826. Photograph by T. Miller, U.S. Geological Survey, August, 1974.

View of part of the interior of Fisher caldera on Unimak Island in the eastern Aleutian Islands. Fisher is an 11x18 km (7x11 mi) caldera that formed about 9,100 years ago producing compositionally zoned ash flows that overtopped topographic barriers more than 500 m (1,640 ft) in elevation. There was one poorly documented historical eruption from Fisher caldera in 1826. Photograph by T. Miller, U.S. Geological Survey, August, 1974.

Date: August 1974
Volcano(es): Fisher
Photographer: Miller, T. P.
URL: avo.alaska.edu/image/view/474
Credit: Image courtesy of AVO / U.S. Geological Survey.
Use Restriction: Please cite the photographer and the Alaska Volcano Observatory/U.S. Geological Survey when using this image.
Full Resolution.