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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 51.79°N
  • 178.794°W

  • 1573 m
    5159 ft

  • 311070
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for Gareloi.

 Available Weekly Reports

There are no Weekly Reports available for Gareloi.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1996 Sep 27 ] [ Unknown ] Uncertain 1  
1989 Aug 17 Unknown Confirmed 1 Historical Observations
1987 Sep 4 Unknown Confirmed 1 Historical Observations
1982 Jan 15 1982 Jan 15 Confirmed 3 Historical Observations
1980 Aug 7 1980 Sep 17 Confirmed 3 Historical Observations
1952 Jan 17 Unknown Confirmed 2 Historical Observations
1950 1951 Confirmed 1 Historical Observations
1929 Apr 1930 Confirmed 3 Historical Observations SE flank fissure (near summit to sea)
[ 1927 ] [ Unknown ] Uncertain    
1922 Unknown Confirmed 3 Historical Observations
1873 Unknown Confirmed 2 Historical Observations
[ 1828 ] [ 1829 ] Uncertain 2  
1792 Unknown Confirmed 2 Historical Observations
1791 Unknown Confirmed 2 Historical Observations
1790 Unknown Confirmed 2 Historical Observations
[ 1760 ] [ Unknown ] Uncertain    

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Coats R R, 1950. Volcanic activity in the Aleutian Arc. U S Geol Surv Bull, 974-B: 35-47.

Coats R R, 1959b. Geologic reconnaissance of Gareloi Island, Aleutian Islands, Alaska. U S Geol Surv Bull, 1028-J: 249-256.

Coombs M L, White S M, Scholl D W, 2007b. Massive edifice failure at Aleutian arc volcanoes. Earth Planet Sci Lett, 256: 403-418.

Henning R A, Rosenthal C H, Olds B, Reading E (eds), 1976. Alaska's volcanoes, northern link in the ring of fire. Alaska Geog, 4: 1-88.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Miller T P, McGimsey R G, Richter D H, Riehle J R, Nye C J, Yount M E, Dumoulin J A, 1998. Catalogue of the historically active volcanoes of Alaska. U S Geol Surv Open-File Rpt, 98-582: 1-104.

Motyka R J, Liss S A, Nye C J, Moorman M A, 1993. Geothermal resources of the Aleutian arc. Alaska Div Geol Geophys Surv, Prof Rpt, no 114, 17 p and 4 map sheets.

Myers J D, 1994. The Geology, Geochemistry and Petrology of the recent Magmatic Phase of the Central and Western Aleutian Arc. Unpublished manuscript, unpaginated.

Smith R L, Shaw H R, Luedke R G, Russell S L, 1978. Comprehensive tables giving physical data and thermal energy estimates for young igneous systems of the United States. U S Geol Surv Open-File Rpt, 78-925: 1-25.

The 8 x 10 km diameter 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 SE-trending fissure. This prominent 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 1573-m-high summit of Gareloi to the coast along three broad axes trending NW, ENE, and south. 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.