Papua Nuova Guinea · Vulcano complesso
Long Island
- Tipo
- Vulcano complesso
- Altitudine
- 1263 m
- Ultima eruzione
- 1993
- Tipo
- Vulcano complesso
- Paese
- Papua Nuova Guinea
- Regione
- Pacifico sud-occidentale / Bismarck Volcanic Arc
- Altitudine
- 1263 m
- Coordinate
- -5.314, 147.105
- Ultima eruzione
- 1993
- Contesto tettonico
- Zona di subduzione / Crosta continentale (> 25 km)
- Forma vulcanica
- Composito
- Roccia principale
- Andesite / Andesite basaltica
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 ingleseLong 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
12 registrateGlossarioCronologia dettagliata
- 1993VEI 1Osservata1993-11-03 – 1993-11-25E-W fissure NNE of Motmot Island
- 1976VEI 1Osservata1976-01-02 – fine sconosciutaMotmot
- 1973VEI 2Osservata1973-04-16 – 1974-02-28Motmot
- 1968VEI 2Osservata1968-03-16 – 1968-06-12Motmot
- 1961VEI ?Metodo non indicato1961-07-02 – fine sconosciutaMotmot
- 1955VEI 3Osservata1955-06-05 – 1955-06-13Motmot
- 1953VEI 3Osservata1953-05-08 – 1954-01-07Motmot
- 1943VEI ?Osservata1943-07-02 – fine sconosciutaMotmot
- 1938VEI ?Osservata1938-07-02 – fine sconosciutaLake Wisdom
- 1933VEI ?Osservata1933-07-02 – fine sconosciutaLake Wisdom
- 1660 (±20 anni)VEI 6Stima geologica1660 – fine sconosciuta
- 2040 a.C. (±110 anni)VEI 6Stima geologica2040 a.C. – fine sconosciuta
Vulcani nelle vicinanze
Link esterni
⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.