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Karkar Island

Karkar

Estratovolcán · 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
Estratovolcán
País
Papua New Guinea
Región
Southwestern Pacific Volcanic Regions / Bismarck Volcanic Arc
Altitud
1839 m
Coordenadas
-4.647, 145.976
Última erupción
1979
Contexto tectónico
Subduction zone / Continental crust (> 25 km)
Forma volcánica
Composite
Roca principal
Andesite / Basaltic Andesite
Resumen geológico

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.

Resumen de Wikipedia

Resumen en inglés

Karkar Island is an oval-shaped volcanic island located in the Bismarck Sea, about 74 kilometres (46 mi) off the north coast of mainland Papua New Guinea in Madang Province, from which it is separated by the Isumrud Strait. The island is about 25 km (16 mi) in length and 19 km (12 mi) in width. In the centre is an active volcano with two nested calderas.

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Historial de erupciones

Resumen (VEI en el tiempo)
Haga clic en una barra para ver erupciones individuales
7140 BCE~6835 BCE · 1 erupciones · VEI máx. 41037 BCE~732 BCE · 1 erupciones · VEI máx. ?488~793 · 2 erupciones · VEI máx. 4793~1099 · 1 erupciones · VEI máx. ?1404~1709 · 1 erupciones · VEI máx. 31709~2014 · 13 erupciones · VEI máx. 37140 BCE5004 BCE2563 BCE427 BCE1709

Línea de tiempo detallada

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

Enlaces externos

⚠ Solo como referencia. No apto para respuesta ante emergencias.