Long Island

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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 5.358°S
  • 147.12°E

  • 1280 m
    4198 ft

  • 251050
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for Long Island.

 Available Weekly Reports

There are no Weekly Reports available for Long Island.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1993 Nov 3 (?) 1993 Nov 25 ± 5 days Confirmed 1 Historical Observations E-W fissure NNE of Motmot Island
1976 Jan 2 ± 120 days Unknown Confirmed 1 Historical Observations Motmot
1973 Apr 1974 Feb 28 Confirmed 2 Historical Observations Motmot
1968 Mar 16 1968 Jun 12 Confirmed 2 Historical Observations Motmot
[ 1961 ] [ Unknown ] Uncertain     Motmot
1955 Jun 5 1955 Jun 13 Confirmed 3 Historical Observations Motmot
1953 May 8 1954 Jan 7 Confirmed 3 Historical Observations Motmot
1943 Unknown Confirmed   Historical Observations Motmot
1938 Unknown Confirmed   Historical Observations Lake Wisdom
1933 Unknown Confirmed   Historical Observations Lake Wisdom
1660 ± 20 years Unknown Confirmed 6 Radiocarbon (uncorrected)
2040 BCE ± 100 years Unknown Confirmed 6 Radiocarbon (uncorrected)

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.

Ball E E, Johnson R W, 1976. Volcanic history of Long Island, Papua New Guinea. In: Johnson R W (ed) {Volcanism in Australasia}, Amsterdam: Elsevier, p 133-148.

Blong R J, 1982. The Time of Darkness Local Legends and Volcanic Reality in Papua New Guinea. Canberra: Aust Natl Univ Press, 257 p.

Cooke R J S, Johnson R W, 1978. Volcanoes and volcanology in Papua New Guinea. Geol Surv Papua New Guinea Rpt, 78/2: 1-46.

Fisher N H, 1957. Melanesia. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 5: 1-105.

Johnson R W, Taylor G A M, Davies R A, 1972. Geology and petrology of Quaternary volcanic islands off the north coast of New Guinea. Aust Bur Min Resour Geol Geophys Rec, 1972/21: 1-127.

Lowenstein P L, 1982. Problems of volcanic hazards in Papua New Guinea. Geol Surv Papua New Guinea Rpt, 82/7: 1-62.

Pain C F, Blong R J, McKee C O, 1981. Pyroclastic deposits and eruptive sequences of Long Island. Part 1: Lithology, stratigraphy, and volcanology. Geol Surv Papua New Guinea Mem, 10: 101-107.

The broad profile of hexagonal-shaped Long Island is dominated by two steep-sided stratovolcanoes, Mount Reaumur in the north and Cerisy Peak in the south. Collapse of the basaltic-andesitic volcanic complex produced a large 10 x 12.5 km caldera, now filled by Lake Wisdom. Caldera formation occurred during at least three major explosive eruptions, about 16,000, 4000, and 300 years ago. The latter was one of the largest historical eruptions in Papua New Guinea and deposited andesitic tephra across the New Guinea highlands, prompting legends of a "Time of Darkness." Post-caldera eruptions have constructed a small cone, Motmot Island, in the south-central part of Lake Wisdom. Moderate explosive eruptions have occurred during the 20th century from vents at and near Motmot Island.