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St. Andrew Strait

Vulcano complesso · Papua New Guinea · 270 m

The St. Andrew Strait volcano is located in the Admiralty Islands north of Papua New Guinea. The volcanic complex consists of a series of overlapping Quaternary cones formed by rhyolitic lava flows and pyroclastic deposits on Lou and Tuluman Islands. Volcanism is aligned along a curved arc, extending through the 12-km-long Lou Island. Tuluman Island, seen here from the SW with Lou Island 1.5 km away at the upper left, was formed during a 1953-57 eruption.
The St. Andrew Strait volcano is located in the Admiralty Islands north of Papua New Guinea. The volcanic complex consists of a series of overlapping Quaternary cones formed by rhyolitic lava flows and pyroclastic deposits on Lou and Tuluman Islands. Volcanism is aligned along a curved arc, extending through the 12-km-long Lou Island. Tuluman Island, seen here from the SW with Lou Island 1.5 km away at the upper left, was formed during a 1953-57 eruption. · Foto: Photo by Wally Johnson, 1964 (Australia Bureau of Mineral Resources).
Tipo
Vulcano complesso
Paese
Papua New Guinea
Regione
Southwestern Pacific Volcanic Regions / Bismarck Sea Volcanic Province
Altitudine
270 m
Coordinate
-2.380, 147.350
Ultima eruzione
1957
Contesto tettonico
Subduction zone / Oceanic crust (< 15 km)
Forma vulcanica
Composite
Roccia principale
Rhyolite
Sintesi geologica

The St. Andrew Strait volcano, located in the Admiralty Islands north of Papua New Guinea, consists of a series of overlapping Quaternary cones formed by rhyolitic lava flows and pyroclastic materials on Lou and Tuluman Islands. Volcanism is aligned on a curved arc extending through the 12-km-long Lou Island. The Tuluman Islands, 1.5 km S of Lou Island, were formed during a 1953-1957 eruption. Pam Lin and Pam Mandian Islands farther to the SE along the same arc contain fresh rhyolitic obsidian similar to that found on Tuluman.

Sintesi da Wikipedia

Riassunto in inglese

St. Andrew Strait is a compound volcano in Papua New Guinea that has had eruptions in historical times. The volcano is not linked to any tectonic plates, the volcano is also in an area of very few earthquakes, suggesting that St. Andrew Strait is an Intraplate volcano. It consists of a group of Quaternary volcanic cones that are mainly rhyolitic in composition. The volcanism is curved, suggesting that the volcano has an ancient caldera. The centre of the volcano is Lou Island. Lou island last erupted in 240 BC and 340 AD, both eruptions came from the Bendal volcano. Lou island is the largest eruptive centre of the volcano, with 6 volcanic vents. The Pam Islands also contain fresh deposits. Historic eruptions have come from the Tuluman Islands.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
240 BCE~41 BCE · 1 eruzioni · VEI max. ?159~358 · 1 eruzioni · VEI max. ?1754~1953 · 3 eruzioni · VEI max. 2240 BCE35875713551754

Cronologia dettagliata

  1. 1953VEI 2Osservata
    1953-06-27 – 1957-01-28
    Tuluman
  2. 1931VEI 0Stima geologica
    1931 – In corso
    Tuluman (?)
  3. 1883VEI 2Osservata
    1883-03-28 – In corso
    Tuluman
  4. 350VEI ?Stima geologica
    350 – In corso
    Lou Island (Bedal volcano)
  5. 240 a.C. (±100 anni)VEI ?Stima geologica
    BCE 240 – In corso
    Lou Island (Bedal volcano)

Link esterni

⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.