Volcano Photos

Fisher Volcano, USA

 Fisher Volcano, USA, Volcano photo

Fisher Volcano, USA

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 9100 years ago during the eruption of compositionally zoned ash flows that overtopped topographic barriers more than 500 m in elevation.

The caldera contains two large lakes and a smaller lake that drains through a notch in the south caldera rim.

There has been one poorly documented historical eruption from Fisher in 1826.

The 11 x 18 km Fisher caldera on western Unimak Island NE of Westdahl volcano is one of the largest calderas in the Aleutian arc.

The caldera, which is elongated in a NE direction, formed around 9400 years ago, accompanied by emission of large-volume, mobile pyroclastic flows that reached the Bering Sea and the Pacific Ocean.

Two satellitic cones are located below the north rim, NE of its 1112-m high point at Eickelberg Peak, which rises more than 900 m above three lakes on the caldera floor, one of which drains through a notch in the southern caldera rim.

A large composite cone, Mount Finch, is found at the center of the caldera, which also contains a small breached cinder cone.

Historical eruptions have occurred in the 18th and 19th centuries.

Low-temperature fumaroles are located at the western flank of Mount Finch, and Turquoise Lake, at the base of the cone, emits hydrogen sulfide gas.

PHOTO SOURCE: Tom Miller, 1974 (U.S. Geological Survey), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.

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