Seal Nunataks Group

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  • Antarctica
  • Antarctica
  • Pyroclastic cone(s)
  • Unknown - Unrest / Holocene
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 65.03°S
  • 60.05°W

  • 368 m
    1207 ft

  • 390050
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Seal Nunataks Group.

The Global Volcanism Program has no Weekly Reports available for Seal Nunataks Group.

Index of Monthly Reports

Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

09/1982 (SEAN 07:09) Two previously unknown recent volcanoes identified


Contents of Monthly Reports

All information contained in these reports is preliminary and subject to change.

09/1982 (SEAN 07:09) Two previously unknown recent volcanoes identified

In January 1982, geologists from the Universidad de Chile found evidence of recent volcanism at two sites in the Seal Nunataks Group that had not previously been identified as recent volcanic centers. At Dallman (65.02°S, 60.32°W), very fresh-looking basaltic lava had emerged from the central crater and flowed to the NW foot of the volcano. Active fumaroles were observed at the N side of the summit. Abundant basaltic lapilli and ash covered wide areas of the Larsen Ice Shelf in the vicinity of Murdoch Volcano (65.03°S, 60.03°W). Portions of these deposits were covered by fresh snow. Fumaroles were active in a small parasitic cinder cone SE of Murdoch.

In December 1893, C.A. Larsen saw an eruption of black ash from Lindenberg (64.92°S, 59.70°W) and solfataric activity at Christensen (65.10°S, 59.57°W), but no activity was observed at either of these volcanoes in 1982.

Information Contact: O. González-Ferrán, Univ. de Chile.

The Seal Nunataks are a group of 16 nunataks emerging from the Larsen Ice Shelf east of Graham Land Peninsula. They have been described as separate volcanic vents or remnants of a large shield volcano. Fumarolic activity was reported from Murdoch and Dallman cones in 1982, and fresh-looking pyroclastics and a lava flow at Dallman (not observed in 1979) were seen on the ice surface three years later (González-Ferrán 1983). Fumarolic activity was observed at Christensen in 1893, and Lindenberg was observed in eruption in 1893. Baker (1968) saw cinders on the ice surface, suggesting a 20th-century eruption. A 1988 British expedition noted that tephra away from nunataks was found only in ice-cored moraines, suggesting a glacial rather than pyroclastic origin. They noted no fumarolic activity, although water vapor resulting from radiant heating of ice-cored moraines was observed.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1980 Jun 15 ± 545 days ] [ Unknown ] Uncertain     Dallman, Murdoch
[ 1893 Dec 11 ] [ Unknown ] Uncertain 1   Lindenberg Island

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.



Synonyms
Nunataks Foca


Cones
Feature Name Feature Type Elevation Latitude Longitude
Akerlundh Cone 65° 3' 0" S 60° 11' 0" W
Arctowsky Cone 65° 6' 0" S 60° 2' 0" W
Bruce Cone 65° 5' 0" S 60° 15' 0" W
Bull Cone 65° 5' 0" S 60° 25' 0" W
Castor Cone 65° 10' 0" S 59° 56' 0" W
Christensen Nunatak Cone 65° 5' 0" S 59° 35' 0" W
Dalman Cone 65° 1' 0" S 60° 19' 0" W
Donald Cone 65° 5' 0" S 60° 7' 0" W
Evensen Cone 64° 59' 0" S 60° 23' 0" W
Gray Cone 65° 6' 0" S 60° 6' 0" W
Hertha Cone 65° 9' 0" S 60° 0' 0" W
Larsen Cone 64° 58' 0" S 60° 5' 0" W
Lindenberg Island Cone 64° 57' 0" S 60° 5' 0" W
Murdoch Cone 65° 2' 0" S 60° 2' 0" W
Oceana Cone 65° 8' 0" S 59° 50' 0" W
Pollux Cone 65° 5' 0" S 59° 54' 0" W
Volcán Murdoch is one of a group of 16 nunataks emerging from the Larsen Ice Shelf east of Graham Land Peninsula that form the Seal Nunataks. The Seal Nunataks have been described as separate volcanic vents or remnants of a large shield volcano. Lindenberg Nunatak was observed to emit columns of thick, black smoke in 1893. Scoria was observed on the ice surface in the Seal Nunataks area during 1968, suggesting a 20th-century eruption.

Photo by Oscar González-Ferrán (University of Chile).

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.

Baker P E, 1968. Comparative volcanology and petrology of the Atlantic island arcs. Bull Volc, 32: 189-206.

Berninghausen W H, Neumann van Padang M, 1960. Antarctica. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 10: 1-32.

Gonzalez-Ferran O, 1983. The Seal Nunataks: an active volcanic group on the Larsen Ice Shelf, West Antarctica. In: Oliver R L, James P R, Jago J B (eds) {Antarctic Earth Science}, New York: Cambridge Univ Press, p 334-337.

LeMasurier W E, Thomson J W (eds), 1990. Volcanoes of the Antarctic Plate and Southern Oceans. Washington, D C: Amer Geophys Union, 487 p.

Smellie J L, Hole M J, 1997. Products and processes in Pliocene-Recent, subaqueous to emergent volcanism in the Antarctic Peninsula: examples of englacial Surtseyan volcano construction. Bull Volc, 58: 628-646.

Volcano Types

Pyroclastic cone(s)

Tectonic Setting

Intraplate
Continental crust (> 25 km)

Rock Types

Major
Basalt / Picro-Basalt
Trachybasalt / Tephrite Basanite

Population

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

Affiliated Databases

Large Eruptions of Seal Nunataks Group 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.