Skip to main content
← Back to map
⇄ Compare

Gareloi Volcano

Gareloi

Stratovolcano · United States · 1573m

Gareloi in the western Aleutian Islands is seen here from the S. This photo shows lava flows with clear levees from a 1980s eruption. The 8 x 10 km diameter Gareloi Island consists of a stratovolcano with two peaks and a SE-trending fissure that formed during a 1929 eruption and extends to the sea.
Gareloi in the western Aleutian Islands is seen here from the S. This photo shows lava flows with clear levees from a 1980s eruption. The 8 x 10 km diameter Gareloi Island consists of a stratovolcano with two peaks and a SE-trending fissure that formed during a 1929 eruption and extends to the sea. · Photo: Photo by Game McGimsey, 2003 (Alaska Volcano Observatory, U.S. Geological Survey). · Wikimedia Commons
Type
Stratovolcano
Country
United States
Region
North America Volcanic Regions / Aleutian Ridge Volcanic Arc
Elevation
1573m
Coordinates
51.790, -178.794
Last eruption
1989
Tectonic setting
Subduction zone / Intermediate crust (15-25 km)
Landform
Composite
Major rock type
Basalt / Picro-Basalt
Geological summary

The 8 x 10 km Gareloi Island, the northernmost volcano of the Delarof Group at the western end of the Andreanof Islands, consists of a stratovolcano with two summits and a prominent SE-trending fissure. The fissure was formed during an eruption in 1929 and extends from the southern summit to the sea. Steep sea cliffs that are cut into rocks of an older, eroded center are found on the SW coast, and submarine deposits of three debris avalanches produced by edifice collapse are found offshore. Young lava flows cover the older volcano from the summit to the coast along three broad axes trending NW, ENE, and S. The 1929 eruption originated from 13 craters along a 4-km-long fissure. Phreatic explosions were followed by the ejection of glassy pumice, lapilli, scoria, and older blocks, as well as by the emission of four short, steep lava flows, one of which reached the SE coast.

From Wikipedia

Mount Gareloi, or Gareloi Volcano, is a stratovolcano in the Aleutian Islands of Alaska, United States, about 1,259 miles (2,026 km) from Anchorage. Gareloi is located on Gareloi Island, and comprises most of its land mass. The island also has two small glaciers which protrude to the northwest and southeast.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1760~1784 · 1 eruptions · max VEI ?1784~1807 · 3 eruptions · max VEI 21807~1831 · 1 eruptions · max VEI 21854~1878 · 1 eruptions · max VEI 21902~1925 · 1 eruptions · max VEI 31925~1949 · 2 eruptions · max VEI 31949~1972 · 2 eruptions · max VEI 21972~1996 · 5 eruptions · max VEI 317601807187819251972

Detailed timeline

  1. 1996VEI 1Geological estimate
    1996-09-27 – Ongoing
  2. 1989VEI 1Observed
    1989-08-17 – 1989-08-17
  3. 1987VEI 1Observed
    1987-08-30 – 1987-09-04
    N crater rim, E flank
  4. 1982VEI 3Observed
    1982-01-15 – 1982-01-15
  5. 1980VEI 3Observed
    1980-08-07 – 1980-09-17
  6. 1952VEI 2Observed
    1952-01-17 – Ongoing
  7. 1950VEI 1Observed
    1950-07-02 – 1951-07-02
  8. 1929VEI 3Observed
    1929-04 – 1930
    SE flank fissure (near summit to sea)
  9. 1927VEI ?Geological estimate
    1927 – Ongoing
  10. 1922VEI 3Observed
    1922 – Ongoing
  11. 1873VEI 2Observed
    1873 – Ongoing
  12. 1828VEI 2Geological estimate
    1828 – 1829
  13. 1792VEI 2Observed
    1792 – Ongoing
  14. 1791VEI 2Observed
    1791 – Ongoing
  15. 1790VEI 2Observed
    1790 – Ongoing
  16. 1760VEI ?Geological estimate
    1760 – Ongoing

External links

⚠ For reference only. Not for emergency response.