Seal Nunataks Group

Photo of this volcano
  • Antarctica
  • Antarctica
  • Pyroclastic cone(s)
  • Unknown - Evidence Credible
  • 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

Most Recent Bulletin Report: September 1982 (SEAN 07:09) Citation IconCite this Report


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 Contacts: O. González-Ferrán, Univ. de Chile.

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

Bulletin Reports - Index


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




Information is preliminary and subject to change. All times are local (unless otherwise noted)


September 1982 (SEAN 07:09) Citation IconCite this Report


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 Contacts: O. González-Ferrán, Univ. de Chile.

Eruptive History


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.

Photo Gallery


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).
See title for photo information.

Smithsonian Sample Collections Database


There are no samples for Seal Nunataks Group in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites