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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 28.98°S
  • 140.25°W

  • -39 m
    -128 ft

  • 333060
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for Macdonald.

 Available Weekly Reports

There are no Weekly Reports available for Macdonald.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1987 Jun 4 1989 Jan 28 (in or after) Confirmed 0 Historical Observations
1986 May 16 1986 Aug 2 Confirmed 0 Hydrophonic
1983 Oct 27 1984 Jan 3 Confirmed 0 Hydrophonic
1983 Mar 14 1983 May 21 Confirmed 0 Hydrophonic
1982 Mar 1 1982 Jun 6 Confirmed 0 Hydrophonic
1980 Nov 10 1981 Feb 15 Confirmed 0 Hydrophonic
1980 Feb 12 1980 Feb 13 Confirmed 0 Hydrophonic
1979 Sep 30 1979 Sep 30 Confirmed 0 Hydrophonic
1977 Dec 10 1977 Dec 15 Confirmed 0 Hydrophonic
1967 May 29 1967 May 29 Confirmed 0 Hydrophonic
1936 Unknown Confirmed 0 Unknown
1928 Unknown Confirmed 0 Unknown

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. 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. Additional discussion of data sources can be found under Volcano Data Criteria.

Duncan R A, McDougall I, 1976. Linear volcanism in French Polynesia. J Volc Geotherm Res, 1: 197-227.

Hekinian R, Bideau D, Stoffers P, Cheminee J L, Muhe R, Puteanus D, Binard N, 1991. Submarine intraplate volcanism in the South Pacific: geological setting and petrology of the Society and Austral regions. J Geophys Res, 96: 2109-2138.

Johnson R H, 1970. Active submarine volcanism in the Austral Islands. Science, 167: 977-979.

Rubin K H, Macdougall J D, 1989. Submarine magma degassing and explosive magmatism at Macdonald (Tamarii) seamount. Nature, 341: 50-52.

Talandier J, Okal E A, 1984b. New surveys of Macdonald Seamount, southcentral Pacific, following volcanoseismic activity, 1977-1983. Geophys Res Lett, 1: 813-816.

Discovered by the detection of teleseismic waves in 1967, Macdonald seamount (also known as Tamarii seamount) rises from a depth of about 1800 m to within 27 m of the sea surface at the eastern end of the Austral Islands. The alkali-basaltic submarine volcano marks the site of a hotspot that was the source of the Austral-Cook island chain. The summit of the seamount, named after volcanologist Gordon Macdonald, consists of a flat plateau about 100 x 150 m wide with an average depth of about 40 m. The summit plateau is capped with spatter cones that form steep-sided pinnacles. Most eruptions of Macdonald have been seismically detected, but in 1987 and 1989 pumice emission was observed from research vessels. Pumice rafts observed in the South Pacific in 1928 and 1936 may also have originated from Macdonald seamount.