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Long Island

Vulcano complesso · Papua New Guinea · 1263 m

The broad profile of Long Island, seen here from the E, is composed of two steep-sided edifices, Mount Reaumur to the north (center) and Cerisy Peak to the south. Collapse of the volcanic complex during at least three major explosive eruptions about 16,000, 4,000, and 300 years ago produced a large 10 x 12.5 km caldera, whose low rim appears at the right.
The broad profile of Long Island, seen here from the E, is composed of two steep-sided edifices, Mount Reaumur to the north (center) and Cerisy Peak to the south. Collapse of the volcanic complex during at least three major explosive eruptions about 16,000, 4,000, and 300 years ago produced a large 10 x 12.5 km caldera, whose low rim appears at the right. · Foto: Photo by Russel Blong, 1976 (Macquarie University). · Wikimedia Commons
Tipo
Vulcano complesso
Paese
Papua New Guinea
Regione
Pacifico sud-occidentale / Bismarck Volcanic Arc
Altitudine
1263 m
Coordinate
-5.314, 147.105
Ultima eruzione
1993
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

The broad profile of 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, 4,000, and 300 years ago. The most recent 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.

Sintesi da Wikipedia

Riassunto in inglese

Long Island is a populated volcanic island in Madang Province, Papua New Guinea. It is located north of the island of New Guinea, separated from it by the Vitiaz Strait. The island's interior contains a 360 m-deep (1,180 ft) freshwater volcanic crater lake and within that lake exists an even smaller island known as Motmot island. During the late 17th or early 18th century virtually all of the biota on the island was destroyed and has subsequently provided scientists a unique opportunity to study recolonization efforts by plants, animals, and humans. The vast majority of the buildings on the island are constructed using vernacular architecture.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
2040 BCE~1848 BCE · 1 eruzioni · VEI max. 61609~1801 · 1 eruzioni · VEI max. 61801~1993 · 10 eruzioni · VEI max. 32040 BCE1080 BCE120 BCE8411801

Cronologia dettagliata

  1. 1993VEI 1Osservata
    1993-11-03 – 1993-11-25
    E-W fissure NNE of Motmot Island
  2. 1976VEI 1Osservata
    1976-01-02 – In corso
    Motmot
  3. 1973VEI 2Osservata
    1973-04-16 – 1974-02-28
    Motmot
  4. 1968VEI 2Osservata
    1968-03-16 – 1968-06-12
    Motmot
  5. 1961VEI ?Stima geologica
    1961-07-02 – In corso
    Motmot
  6. 1955VEI 3Osservata
    1955-06-05 – 1955-06-13
    Motmot
  7. 1953VEI 3Osservata
    1953-05-08 – 1954-01-07
    Motmot
  8. 1943VEI ?Osservata
    1943-07-02 – In corso
    Motmot
  9. 1938VEI ?Osservata
    1938-07-02 – In corso
    Lake Wisdom
  10. 1933VEI ?Osservata
    1933-07-02 – In corso
    Lake Wisdom
  11. 1660 (±20 anni)VEI 6Stima geologica
    1660 – In corso
  12. 2040 a.C. (±110 anni)VEI 6Stima geologica
    BCE 2040 – In corso

Link esterni

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