Duncan Canal

Photo of this volcano
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  • United States
  • Alaska
  • Volcanic field
  • Unknown - Undated Evidence
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 56.5°N
  • 133.1°W

  • 15 m
    49 ft

  • 315050
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Duncan Canal.

The Global Volcanism Program has no Weekly Reports available for Duncan Canal.

The Global Volcanism Program has no Bulletin Reports available for Duncan Canal.

Conspicuous fresh-looking pahoehoe and aa lava flows overlie glacial till at Kupreanof Island in the central panhandle of SE Alaska. Quaternary basaltic lava flows of Holocene and/or Pleistocene age up to 10 m thick form several broad flat-lying peninsulas and scattered outcrops on the shores of Sumner Strait at the southern end of Kupreanof Island (Brew et al. 1985). On a peninsula in Kah Sheets Bay a basaltic flow depositionally overlies till of the youngest glaciation, and youthful-looking flows are exposed along a broad 12-km-wide front westward toward Douglas Bay. Two probable vents are found to the north within Mesozoic and Paleozoic rocks at the northern end of the Castle Islands in the Duncan Canal fault zone, and at Indian Point the flows contain inclusions of picrite. At High Castle Island, the basaltic flows are columnar-jointed and overlie planar to cross-bedded coarse sandstone and poorly sorted volcaniclastic conglomerate. Basaltic flows in the Duncan Canal area are both subaerial and submarine.

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

The Global Volcanism Program has no synonyms or subfeatures listed for Duncan Canal.

The Castle Islands (center) lie within Duncan Canal on Kupreanof Island in SE Alaska, as seen looking NW from the Lindenberg Peninusla. The Castle Islands mostly consist of Tertiary sedimentary and volcanic rocks, but the northernmost island (far right side of the island group) contains Quaternary basalts. Conspicuous fresh-looking pahoehoe and aa lava flows are also found at the south end of Kupreanof Island, where they overlie glacial till.

Photo by Susan Karl (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.

Brew D A, Karl S M, Tobey E F, 1985. Re-interpretation of the age of the Kuiu-Etolin belt volcanic rocks, Kupreanof Island, southeastern Alaska. In: Bartsch-Winkler S, Reed K M (eds) {The United States Geological Survey in Alaska: accomplishments during 1983}, U S Geol Surv Circ, 945: 86-88.

Karl S M, Haeussler P J, McCafferty A, 1999. Reconnaissance geologic map of the Duncan Canal-Zarembo Island area, southeastern Alaska. U S Geol Surv Open-File Rpt, 99-168.

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

Volcano Types

Volcanic field

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Basalt / Picro-Basalt

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
0
0
60
7,558

Affiliated Databases

Large Eruptions of Duncan Canal 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.