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Mount Amukta

Amukta

Stratovolcano · United States · 1066m

Amukta in the central Aleutians is located along the coast of the 8-km-wide island of the same name. It has had several eruptions since the late 18th century from both summit and flank vents.
Amukta in the central Aleutians is located along the coast of the 8-km-wide island of the same name. It has had several eruptions since the late 18th century from both summit and flank vents. · Photo: Photo by U.S. Fish and Wildlife Service, 1972 (courtesy of Alaska Volcano Observatory). · Wikimedia Commons
Type
Stratovolcano
Country
United States
Region
North America Volcanic Regions / Aleutian Ridge Volcanic Arc
Elevation
1066m
Coordinates
52.500, -171.252
Last eruption
1996
Tectonic setting
Subduction zone / Intermediate crust (15-25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

The symmetrical Amukta stratovolcano lies in the central Aleutians SW of Chagulak Island and is the westernmost of the Islands of the Four Mountains group. The stratovolcano was constructed at the northern side of an arcuate caldera-like feature that is open to the sea along the southern coast of the 8-km-wide Amukta Island. It overlies a broad shield volcano and is topped by a 400-m-wide crater, and a cinder cone is located near the NE coast. There have been several reported eruptions from both summit and flank vents.

From Wikipedia

The undissected stratovolcano of Amukta volcano makes up most of nearly circular, 7.7-km-wide Amukta Island. It is the westernmost of the Islands of Four Mountains chain. The nearest islands to it are Yunaska and Seguam Island; it is separated from Seguam Island by Amukta Pass. The cone, about 5.8 km in basal diameter and topped by a 0.4 km wide summit crater, appears on synthetic-aperture radar imagery to be built upon a 300+ meter high, east-west trending arcuate ridge.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1770~1793 · 2 eruptions · max VEI 31861~1884 · 2 eruptions · max VEI ?1952~1974 · 1 eruptions · max VEI 31974~1997 · 3 eruptions · max VEI 117701815188419291974

Detailed timeline

  1. 1997VEI 1Observed
    1997-03-03 – Ongoing
  2. 1996VEI 1Observed
    1996-09-17 – 1996-09-18
  3. 1987VEI 1Observed
    1987-09-04 – 1987-09-04
  4. 1963VEI 3Observed
    1963-02-13 – Ongoing
  5. 1878VEI ?Observed
    1878 – Ongoing
  6. 1876VEI ?Geological estimate
    1876 – Ongoing
  7. 1786VEI 3Observed
    1786-06 – 1791
  8. 1770VEI ?Geological estimate
    1770 – Ongoing

External links

⚠ For reference only. Not for emergency response.