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United States · Stratovolcano

Fisher Caldera

Fisher

Type
Stratovolcano
Elevation
1112m
Last eruption
1830
Fisher Caldera
Photo: Tom Miller (U.S. Geological Survey) · Public domain · Wikimedia Commons
Type
Stratovolcano
Country
United States
Region
North America / Aleutian Ridge Volcanic Arc
Elevation
1112m
Coordinates
54.650, -164.430
Last eruption
1830
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic andesite

Geological summary

The Fisher caldera, on western Unimak Island NE of Westdahl volcano, is 11 x 18 km elongated in a NE direction It formed around 9,400 years ago, accompanied by emission of large-volume pyroclastic flows that reached the Bering Sea and the Pacific Ocean.

Excerpt from the Global Volcanism Program, Smithsonian Institution · Read the full summary on GVP →

From Wikipedia

Fisher Caldera, also known as Mount Fisher and Fisher Volcano, is a large volcanic caldera, measuring about 6.8 miles (11 km) by 11 miles (18 km), located on Unimak Island in the Aleutian Islands of Alaska. Formed by the destructive eruption of an andesitic stratovolcano about 9,100 years ago, it contains three crater lakes, one 2 miles (3.2 km) wide and two others about 1.5 miles (2.4 km) wide. Small peaks rising 2,000 feet (600 m) and 2,031 feet (619 m) are also present in the caldera. Fisher Caldera is located just 13 miles (21 km) from the Mount Westdahl volcano.

Wikipedia · CC BY-SA · Read full article →

Eruption history

6 recordedGlossary

Record summary

Confirmed eruptions
6
Uncertain eruptions
0
Span of confirmed record
7420 BCE (±200 yrs) – 1830
Largest confirmed eruption
VEI 6 (7420 BCE)
Confirmed eruptions since 1900
0
Summary (VEI over time)
Click a bar to see individual eruptions · Use arrow keys to move between bars, Enter to open
7420 BCE~7112 BCE · 1 eruptions · max VEI 63412 BCE~3103 BCE · 1 eruptions · max VEI 5288~597 · 1 eruptions · max VEI ?1522~1830 · 3 eruptions · max VEI 37420 BCE5262 BCE2795 BCE637 BCE1522

Detailed timeline

  1. 1830VEI 2Observed
    1830-08-16 – end unknown
    Mount Finch
  2. 1826VEI 3Observed
    1826-10-11 – 1827-01-16
    Mount Finch
  3. 1795VEI ?Observed
    1795 – end unknown
  4. 400 (±50 yrs)VEI ?Geological estimate
    400 – end unknown
    Turquoise cone
  5. 3170 BCE (±75 yrs)VEI 5Geological estimate
    3170 BCE – end unknown
    Turquoise cone
  6. 7420 BCE (±200 yrs)VEI 6Geological estimate
    7420 BCE – end unknown
    NE and SW parts of Fisher caldera

Nearby volcanoes

External links

⚠ For reference only. Not for emergency response.