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Karkar Island

Karkar

Stratovolkan · 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
Tipe
Stratovolkan
Negara
Papua New Guinea
Wilayah
Southwestern Pacific Volcanic Regions / Bismarck Volcanic Arc
Ketinggian
1839 m
Koordinat
-4.647, 145.976
Letusan terakhir
1979
Kondisi tektonik
Subduction zone / Continental crust (> 25 km)
Bentuk lahan
Composite
Batuan utama
Andesite / Basaltic Andesite
Ringkasan geologi

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.

Ringkasan Wikipedia

Ringkasan Inggris

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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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
7140 BCE~6835 BCE · 1 letusan · VEI maks. 41037 BCE~732 BCE · 1 letusan · VEI maks. ?488~793 · 2 letusan · VEI maks. 4793~1099 · 1 letusan · VEI maks. ?1404~1709 · 1 letusan · VEI maks. 31709~2014 · 13 letusan · VEI maks. 37140 BCE5004 BCE2563 BCE427 BCE1709

Garis waktu rinci

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

Tautan eksternal

⚠ Untuk referensi saja. Bukan untuk tanggap darurat.