Photo of this volcano
  • United States
  • Alaska
  • Stratovolcano
  • 1830 CE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 54.65°N
  • 164.43°W

  • 1112 m
    3647 ft

  • 311350
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Fisher.

The Global Volcanism Program has no Weekly Reports available for Fisher.

The Global Volcanism Program has no Bulletin Reports available for Fisher.

Eruptive History

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1830 Aug Unknown Confirmed 2 Historical Observations Mount Finch
1826 Oct 11 1827 Jan (?) Confirmed 3 Historical Observations Mount Finch
1795 (in or before) Unknown Confirmed   Historical Observations
0400 ± 50 years Unknown Confirmed   Radiocarbon (uncorrected) Turquoise cone
3170 BCE ± 75 years Unknown Confirmed 5 Radiocarbon (uncorrected) Turquoise cone
7420 BCE ± 200 years Unknown Confirmed 6 Radiocarbon (uncorrected) NE and SW parts of Fisher caldera

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Photo Gallery

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.

Photo by Tom Miller, 1974 (U.S. Geological Survey).
See title for photo information.

Smithsonian Sample Collections Database

The following 11 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections. Catalog number links will open a window with more information.

Catalog Number Sample Description
NMNH 117233-174 Pumice
NMNH 117233-175 Pumice
NMNH 117233-176 Pumice
NMNH 117233-177 Bomb
NMNH 117233-178 Tuff
NMNH 117233-179 Pumice
NMNH 117233-181 Pumice
NMNH 117233-182 Glass
NMNH 117233-185 Pumice
NMNH 117233-186 Obsidian
NMNH 117233-187 Obsidian

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