Adagdak

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  • United States
  • Alaska
  • Stratovolcano
  • Unknown - Unrest / Pleistocene
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 51.988°N
  • 176.592°W

  • 610 m
    2001 ft

  • 311800
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Adagdak.

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

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

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude
311800

Unknown - Unrest / Pleistocene

610 m / 2001 ft

51.988°N
176.592°W

Volcano Types

Stratovolcano
Lava dome(s)

Tectonic Setting

Subduction zone
Intermediate crust (15-25 km)

Geological Summary

Mount Adagdak, at the NE tip of Adak Island, lies across Andrew Lagoon from Mount Moffett volcano and about 15 km NNE of Adak, the largest town of the Aleutians. Adagdak consists of a small stratovolcano capping an older shield volcano exposed on the southern side of the complex. An andesitic lava dome fills the summit crater. A late-stage basaltic lava dome was constructed on the SE flank, and a phreatic vent is located on the western flank of the shield volcano. The most recent eruptions have been considered to be Holocene (Marsh, in Wood and Kienle 1990) or Pleistocene (Motyka et al. 1993, Nye et al. 1998). Three stages of volcanism were mapped by Bratten, the youngest of which was a lava dome dated at about 0.21 million years (AVO, 2005-). The older Andrew Bay volcano, located north of Andrew Lagoon between Adagdak and Moffett volcanoes, is preserved only in erosional remnants. Andrew Bay Hot Springs lie along the coast west of Mount Adagdak, and the northern part of Adak Island has been investigated for geothermal power potential.

References

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

Alaska Volcano Observatory, 2005-. Volcanoes. http://www.avo.alaska.edu/volcanoes.php.

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, 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.

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

The Global Volcanism Program is not aware of any Holocene eruptions from Adagdak. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Adagdak page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

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.


Craters

Feature Name Feature Type Elevation Latitude Longitude
Andrew Bay Caldera 51° 58' 0" N 176° 38' 0" W

Thermal

Feature Name Feature Type Elevation Latitude Longitude
Andrew Bay Hot Springs Hot Spring 51° 59' 20" N 176° 37' 0" W

Photo Gallery


Adagdak, at the NE tip of Adak Island, consists of a small stratovolcano capping an older shield volcano exposed on the southern side of the complex. Three stages of volcanism were mapped, the youngest of which was a lava dome dated at about 0.21 million years. Andrew Bay Hot Springs lie along the coast west of Mount Adagdak, and the northern part of Adak Island has been investigated for geothermal power potential.

Photo by Chris Waythomas, 2000 (Alaska Volcano Observatory, U.S. Geological Survey).

Smithsonian Sample Collections Database


A listing of samples from the Smithsonian collections will be available soon.

Affiliated Sites

Large Eruptions of Adagdak 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).
MODVOLC - HIGP MODIS Thermal Alert System Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.
MIROVA Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.