Moffett

Photo of this volcano
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  • United States
  • Alaska
  • Stratovolcano
  • 1600 BCE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 51.944°N
  • 176.747°W

  • 1196 m
    3923 ft

  • 311111
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Moffett.

The Global Volcanism Program has no Weekly Reports available for Moffett.

The Global Volcanism Program has no Bulletin Reports available for Moffett.

Rising above Adak, the largest town of the Aleutians, Mount Moffett is a modest-sized, eroded stratovolcano with several flank lava domes. The summit cone has been largely destroyed by glacial erosion, and has been filled by an andesitic plug dome. Five other lava domes are scattered over the flanks of the volcano. The south flank lava dome is one of the youngest features of the northern Adak Island volcanoes. The Heart Lake lava flow west of Sweeper Cove on the SE side of the volcano is another young volcanic feature. Several Holocene ash layers on Adak Island have been attributed to Moffett volcano. Its proximity to Adak Naval Air Station makes this one of the most accessible of the Aleutian volcanoes. Kiguga Warm Springs are located at Cape Kiguga, west of Mount Moffet, and the northern part of Adak Island has been investigated for geothermal power production.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1600 BCE (?) Unknown Confirmed   Radiocarbon (corrected) Sandwich Ash deposit
3750 BCE (?) Unknown Confirmed   Radiocarbon (corrected) Intermediate Ash deposit
7850 BCE (?) Unknown Confirmed   Radiocarbon (corrected) Main Ash deposit

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.


Thermal

Feature Name Feature Type Elevation Latitude Longitude
Kiguga Warm Springs Hot Spring 51° 55' 0" N 176° 50' 0" W
The slopes of Mount Adagdak provide a dramatic view of Mount Moffett across Andrew Bay to the SW. A narrow spit separates the bay from Andrew Lagoon (left). Andrew Bay volcano is the oldest of three volcanic centers on northern Adak Island. Mount Moffett rises above Adak (out of view to the left), the largest town of the Aleutians, and is a modest-sized, eroded stratovolcano with several flank lava domes. A south-flank lava dome is one of the youngest volcanic features of the northern Adak Island volcanoes.

Photo courtesy of Alaska Volcano Observatory, U.S. Geological Survey.

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. 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.

Coats R R, 1956a. Geology of northern Adak Island, Alaska. U S Geol Surv Bull, 1028-C: 47-66.

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

Marsh B D, 1990. . (pers. comm.).

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.

Myers J D, Frost C D, 1994. A petrologic re-investigation of the Adak volcanic center, central Aleutian arc, Alaska. J Volc Geotherm Res, 60: 109-146.

Myers J D, March B D, Sinha A K, 1985. Strontium isotopic and selected trace element variations between two Aleutian volcanic centers (Adak and Atka): implications for the development of arc volcanic plumbing systems. Contr Mineral Petr, 91: 221-234.

Nye C J, McGimsey G, Power J, 1998. Volcanoes of Alaska. Alaska Div Geol Geophys Surv, Inf Circ, 38.

Waythomas C F, Miller T P, Nye C J, 2003. Geology and late Quaternary eruptive history of Kanaga volcano, a calc-alkaline stratovolcano in the western Aleutian Islands, Alaska. Studies by the U.S. Geological Survey in Alaska, 2001 U S Geol Surv Profl Pap, 1678: 181-197.

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

Volcano Types

Stratovolcano
Shield
Lava dome(s)

Tectonic Setting

Subduction zone
Intermediate crust (15-25 km)

Rock Types

Major
Andesite / Basaltic Andesite
Basalt / Picro-Basalt

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
0
0
0
0

Affiliated Databases

Large Eruptions of Moffett Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.