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Fisher volcano

Stratovolcano 1112 m / 3,648 ft
United States, Aleutian Islands, 54.65°N / -164.43°W
Current status: dormant (1 out of 5)
Fisher volcano books
Typical eruption style: unspecified
Fisher volcano eruptions: 1830 
TimeMag. / DepthDistanceLocation
Fri, 30 Jun
Fri, 30 Jun 12:08 UTCM 4.7 / 106 km10 kmUnimak Island Region, Alaska

Background:

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.
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Smithsonian / GVP volcano information

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