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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 58.236°N
  • 155.1°W

  • 1864 m
    6114 ft

  • 312160
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for Trident.

 Available Weekly Reports

There are no Weekly Reports available for Trident.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1974 Jul 15 ± 45 days Unknown Confirmed 3 Historical Observations SW flank
1968 Nov 13 1968 Nov 13 Confirmed 3 Historical Observations SW flank
1967 Sep 5 1968 Feb 25 Confirmed 3 Historical Observations SW flank
1966 (?) Unknown Confirmed   Historical Observations SW flank
1964 May 31 Unknown Confirmed 3 Historical Observations SW flank
1963 Oct 17 1963 Nov 17 (?) Confirmed 3 Historical Observations SW flank
1963 Apr 1 1963 Apr 3 Confirmed 3 Historical Observations SW flank
1962 Jun 9 1962 Jun 9 Confirmed 3 Historical Observations SW flank
1961 Jun 30 (?) Unknown Confirmed 2 Historical Observations SW flank (1100 m)
1957 1960 Aug 10 (?) Confirmed 2 Historical Observations SW flank
1956 Sep 8 1956 Sep 9 Confirmed 2 Unknown
1953 Feb 15 1954 Oct 5 (?) Confirmed 3 Historical Observations SW flank (1100 m)
1950 Jul 2 1950 Aug 18 Confirmed 2 Unknown
1949 Jun Unknown Confirmed   Historical Observations
1913 Sep Unknown Confirmed 1 Historical Observations

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.

Coombs M L, Eichelberger J C, Rutherford M J, 2000. Magma storage and mixing conditions for the 1953-1974 eruptions of Southwest Trident volcano, Katmai National Park, Alaska. Contr Mineral Petr, 140: 99-118.

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.

Hildreth W, 1987. New perspectives on the eruption of 1912 in the Valley of Ten Tousand Smokes, Katmai National Park, Alaska. Bull Volc, 49: 680-693.

Hildreth W, Fierstein J, 2000. Katmai volcanic cluster and the great eruption of 1912. Geol Soc Amer Bull, 112: 1594-1620.

Hildreth W, Fierstein J, Lanphere M A, Siems D F, 2003a. Trident volcano: four contiguous stratocones adjacent to Katmai Pass, Alaska Peninsula. Studies by the U.S. Geological Survey in Alaska, 2001 U S Geol Surv Profl Pap, 1678: 153-180.

Hildreth W, Lanphere M A, Fierstein J, 2003b. Geochronology and eruptive history of the Katmai volcanic cluster, Alaska Peninsula. Earth Planet Sci Lett, 214: 93-114.

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.

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.

Wood C A, Kienle J (eds), 1990. Volcanoes of North America. Cambridge, England: Cambridge Univ Press, 354 p.

The Trident stratovolcano cluster was named for the three prominent peaks that were the most visible features at the summit prior to 1953. The andesitic-dacitic Trident group consists of four overlapping stratovolcanoes and numerous flank lava domes, including Falling Mountain and Mt. Cerberus on the far west flank. The summit complex of Trident is located 3-5 km SE of Novarupta volcano, and merges along a ridge to the NE with Katmai volcano. The three oldest Trident volcanoes are glaciated and Pleistocene in age, while the youngest, Southwest Trident, was formed during historical time. Eruptions at the Trident complex migrated stepwise with time from the NE to the SW. In 1953 a new lava dome began growing on the SW flank of Trident I volcano. A series of thick andesitic lava flows were erupted between 1953 and 1968, forming a cone with 400-800 m of local relief. Periodic explosions took place until 1974, and the current summit contains a 350-m-wide crater. Some of the distal lava flows from West Trident stratovolcano collapsed into the Novarupta vent during its 1912 eruption.