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Ritter

Ritter Island

Stratovulcano · Papua New Guinea · 75 m

This arcuate, 1.9-km-long, 200-m-wide island is what remains of Ritter Island after its collapse in 1888. Prior to 1888 this was a steep-sided nearly circular island about 780 m high. Large-scale slope failure removed the summit of the conical volcano, leaving an arcuate 140-m-high west-facing scarp, seen here from the SW. Two minor post-collapse explosive eruptions occurred offshore during 1972 and 1974.
This arcuate, 1.9-km-long, 200-m-wide island is what remains of Ritter Island after its collapse in 1888. Prior to 1888 this was a steep-sided nearly circular island about 780 m high. Large-scale slope failure removed the summit of the conical volcano, leaving an arcuate 140-m-high west-facing scarp, seen here from the SW. Two minor post-collapse explosive eruptions occurred offshore during 1972 and 1974. · Foto: Photo by Wally Johnson, 1974 (Australia Bureau of Mineral Resources). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Papua New Guinea
Regione
Southwestern Pacific Volcanic Regions / Bismarck Volcanic Arc
Altitudine
75 m
Coordinate
-5.519, 148.115
Ultima eruzione
2007
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

Prior to 1888, Ritter Island was a steep-sided, nearly circular island about 780 m high between Umboi and Sakar Islands. Several historical explosive eruptions had been recorded prior to 1888, when large-scale slope failure destroyed the summit of the conical basaltic-andesitic volcano, leaving the arcuate 140-m-high island with a steep west-facing scarp. Devastating tsunamis were produced by the collapse and swept the coast of Papua New Guinea and offshore islands. Two minor post-collapse explosive eruptions, during 1972 and 1974, occurred offshore within the largely submarine 3.5 x 4.5 km breached depression formed by the collapse.

Sintesi da Wikipedia

Riassunto in inglese

Ritter Island is a small, uninhabited, crescent-shaped volcanic island 100 kilometres (62 mi) north-east of New Guinea, in the Bismarck Sea, situated between Umboi Island and Sakar Island in the Morobe Province of Papua New Guinea (PNG) and close to New Britain island.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
1700~1731 · 1 eruzioni · VEI max. 31792~1823 · 1 eruzioni · VEI max. 21823~1854 · 1 eruzioni · VEI max. ?1854~1884 · 1 eruzioni · VEI max. ?1884~1915 · 3 eruzioni · VEI max. 21946~1976 · 2 eruzioni · VEI max. 11976~2007 · 3 eruzioni · VEI max. 217001761185419151976

Cronologia dettagliata

  1. 2007VEI 1Osservata
    2007-05-19 – 2007-05-21
  2. 2006VEI 1Osservata
    2006-10-17 – 2006-10-17
  3. 2002VEI 2Stima geologica
    2002-08-02 – 2002-08-02
  4. 1974VEI 1Osservata
    1974-10-17 – 1974-10-17
    600-900 m W of Ritter Island
  5. 1972VEI 1Osservata
    1972-10-09 – 1972-10-09
    West of Ritter Island
  6. 1888VEI 2Osservata
    1888-03-13 – 1888-03-13
  7. 1887VEI 2Stima geologica
    1887-02-02 – 1887-02-05
    Volcano Uncertain: Probably Ritter or Langila
  8. 1885VEI ?Stima geologica
    1885-01-13 – In corso
  9. 1878VEI ?Stima geologica
    1878-12-31 – In corso
  10. 1848VEI ?Stima geologica
    1848-04-13 – 1848-07-10
  11. 1793VEI 2Osservata
    1793-06-29 – In corso
  12. 1700VEI 3Osservata
    1700-04-03 – 1700-04-06

Link esterni

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