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Karkar

Stratovulcano · Papua New Guinea · 1839 m

An ash plume rises above the summit of Karkar volcano in 1979. There are two nested summit calderas at the summit of the forested volcano resulting in a broad, low profile. The 5.5-km-wide outer caldera was formed during one or more eruptions, the last of which occurred 9,000 years ago. The 3.2-km-wide inner caldera was formed sometime between 1,500 and 800 years ago. Most historical eruptions, like this one in 1979, have originated from Bagiai cone within the 300-m-deep inner caldera.
An ash plume rises above the summit of Karkar volcano in 1979. There are two nested summit calderas at the summit of the forested volcano resulting in a broad, low profile. The 5.5-km-wide outer caldera was formed during one or more eruptions, the last of which occurred 9,000 years ago. The 3.2-km-wide inner caldera was formed sometime between 1,500 and 800 years ago. Most historical eruptions, like this one in 1979, have originated from Bagiai cone within the 300-m-deep inner caldera. · Foto: Photo by Wally Johnson, 1979 (Australia Bureau of Mineral Resources). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Papua New Guinea
Regione
Southwestern Pacific Volcanic Regions / Bismarck Volcanic Arc
Altitudine
1839 m
Coordinate
-4.647, 145.976
Ultima eruzione
1979
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

Karkar is a 19 x 25 km forest-covered island that is truncated by two nested summit calderas. The 5.5 km outer caldera was formed during one or more eruptions, the last of which occurred 9,000 years ago. The steep-walled 300-m-deep, 3.2 km diameter, inner caldera was formed sometime between 1,500 and 800 years ago. Cones are present on the N and S flanks of this basaltic-to-andesitic volcano; a linear array of small cones extends from the northern rim of the outer caldera nearly to the coast. Recorded eruptions date back to 1643 from Bagiai, a pyroclastic cone constructed within the inner caldera, the floor of which is covered by young, mostly unvegetated andesitic lava flows.

Sintesi da Wikipedia

Riassunto breve — apri l'articolo completo per maggiori dettagli.

Karkar è un'isola vulcanica di Papua Nuova Guinea.

Wikipedia · CC BY-SA · Leggi l'articolo completo →

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
7140 BCE~6835 BCE · 1 eruzioni · VEI max. 41037 BCE~732 BCE · 1 eruzioni · VEI max. ?488~793 · 2 eruzioni · VEI max. 4793~1099 · 1 eruzioni · VEI max. ?1404~1709 · 1 eruzioni · VEI max. 31709~2014 · 13 eruzioni · VEI max. 37140 BCE5004 BCE2563 BCE427 BCE1709

Cronologia dettagliata

  1. 2014VEI 1Osservata
    2014-03-26 – 2014-03-27
    Uncertain
  2. 2013VEI 3Osservata
    2013-01-29 – 2013-03-15
    Bagiai cone
  3. 2012VEI 3Osservata
    2012-02-01 – 2012-02-01
    Unknown
  4. 2010VEI 1Osservata
    2010-02-25 – 2010-02-26
    Uncertain
  5. 2009VEI ?Stima geologica
    2009-05-01 – In corso
  6. 1980VEI 1Stima geologica
    1980-01-07 – 1980-01-17
  7. 1979VEI 2Osservata
    1979-01-12 – 1979-08-09
    SE foot of Bagiai
  8. 1974VEI 2Osservata
    1974-02-14 – 1974-08-08
    Bagiai
  9. 1974VEI 2Osservata
    1974-12-30 – 1975-06-26
    Bagiai
  10. 1962VEI 2Stima geologica
    1962-07-02 – In corso
    Ulumam
  11. 1895VEI 2Osservata
    1895-06-17 – 1895-08
  12. 1885VEI 2Osservata
    1885 – In corso
  13. 1830VEI ?Stima geologica
    1830 – In corso
  14. 1643VEI 3Osservata
    1643-04-20 – In corso
  15. 1070 (±200 anni)VEI ?Stima geologica
    1070 – In corso
    South flank (Patilo Cone)
  16. 730VEI 4Stima geologica
    730 – In corso
  17. 520 (±100 anni)VEI 4Stima geologica
    520 – In corso
  18. 870 a.C. (±75 anni)VEI ?Stima geologica
    BCE 870 – In corso
  19. 7140 a.C. (±150 anni)VEI 4Stima geologica
    BCE 7140 – In corso

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