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Pulau Raoul

Raoul Island

Stratovolkan · New Zealand · 516 m

Anvil-shaped Raoul Island is the largest and northernmost of the Kermadec Islands. Two calderas are prominent in this International Space Station view with N to the upper right. The 2.5 x 3.5 km caldera cuts the center of the island, and the E wall of the partially submerged Denham Bay caldera rises above the smooth coastline at the left-center. The 6.5 x 4 km wide Denham Bay caldera formed during a major dacitic explosive eruption about 2,200 years ago, which truncated the W side of the island.
Anvil-shaped Raoul Island is the largest and northernmost of the Kermadec Islands. Two calderas are prominent in this International Space Station view with N to the upper right. The 2.5 x 3.5 km caldera cuts the center of the island, and the E wall of the partially submerged Denham Bay caldera rises above the smooth coastline at the left-center. The 6.5 x 4 km wide Denham Bay caldera formed during a major dacitic explosive eruption about 2,200 years ago, which truncated the W side of the island. · Foto: NASA International Space Station image ISS002-E-8883, 2001 (http://eol.jsc.nasa.gov/). · Wikimedia Commons
Tipe
Stratovolkan
Negara
New Zealand
Wilayah
Tonga-Kermadec Volcanic Regions / Northern Kermadec Volcanic Arc
Ketinggian
516 m
Koordinat
-29.270, -177.920
Letusan terakhir
2006
Kondisi tektonik
Subduction zone / Oceanic crust (< 15 km)
Bentuk lahan
Composite
Batuan utama
Andesite / Basaltic Andesite
Ringkasan geologi

Anvil-shaped Raoul Island is the largest and northernmost of the Kermadec Islands. During the past several thousand years volcanism has been dominated by dacitic explosive eruptions. Two Holocene calderas exist, the older of which cuts the center the island and is about 2.5 x 3.5 km wide. Denham caldera, formed during a major dacitic explosive eruption about 2200 years ago, truncated the W side of the island and is 6.5 x 4 km wide. Its long axis is parallel to the tectonic fabric of the Havre Trough that lies W of the volcanic arc. Historical eruptions during the 19th and 20th centuries have sometimes occurred simultaneously from both calderas, and have consisted of small-to-moderate phreatic eruptions, some of which formed ephemeral islands in Denham caldera. An unnamed submarine cone, one of several located along a fissure on the lower NNE flank, has also erupted during historical time, and satellitic vents are concentrated along two parallel NNE-trending lineaments.

Ringkasan Wikipedia

Pulau Raoul atau Pulau Minggu merupakan pulau terbesar dan paling utara dari Kepulauan Kermadec. Pulau ini terletak berjarak 900 km (560 mi) selatan-barat daya dari Pulau 'Ata, Tonga dan 1.100 km (680 mi) timur laut dari Pulau Utara, Selandia Baru. Pulau ini sering mengalami aktivitas vulkanik selama beberapa ribu tahun terakhir yang didominasi oleh letusan eksplosif dasit.

Wikipedia · CC BY-SA · Baca artikel lengkap →

Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
2000 BCE~1809 BCE · 1 letusan · VEI maks. 41237 BCE~1046 BCE · 1 letusan · VEI maks. 4283 BCE~92 BCE · 1 letusan · VEI maks. 692 BCE~98 · 1 letusan · VEI maks. 398~289 · 1 letusan · VEI maks. 4289~480 · 1 letusan · VEI maks. 4480~671 · 1 letusan · VEI maks. 4671~861 · 2 letusan · VEI maks. 41434~1624 · 1 letusan · VEI maks. ?1624~1815 · 3 letusan · VEI maks. 41815~2006 · 5 letusan · VEI maks. 32000 BCE1046 BCE92 BCE8611815

Garis waktu rinci

  1. 2006VEI 1Teramati
    2006-03-17 – 2006-03-17
    Green Lake crater
  2. 1987VEI 0Perkiraan geologi
    1987-03-25 – 1987-03-25
    NNE flank (7 km from Raoul Island)
  3. 1964VEI 2Teramati
    1964-11-19 – 1965-04-25
    West side of Green Lake, Denham caldera
  4. 1886VEI 0Teramati
    1886-03 – Berlangsung
    NNE flank (7.5 km from Raoul Island)
  5. 1870VEI 3Teramati
    1870-06-20 – 1870-10-03
    Denham caldera, Green Lake
  6. 1814VEI 3Teramati
    1814-03-09 – Berlangsung
    Denham caldera and Smith Crater
  7. 1720 (±50 tahun)VEI 4Perkiraan geologi
    1720 – Berlangsung
    Denham Bay?, Tui Lake Crater
  8. 1630 (±50 tahun)VEI 4Perkiraan geologi
    1630 – Berlangsung
    Rangitahua Crater
  9. 1450VEI ?Perkiraan geologi
    1450 – Berlangsung
    NE of Raoul Island (Meyer Islands)
  10. 850VEI 4Perkiraan geologi
    850 – Berlangsung
    Expedition Crater
  11. 700VEI 3Perkiraan geologi
    700 – Berlangsung
    Pukekohu Crater
  12. 550VEI 4Perkiraan geologi
    550 – Berlangsung
    Green Lake Pumice Crater
  13. 400VEI 4Perkiraan geologi
    400 – Berlangsung
    S part Raoul Caldera
  14. 100VEI 4Perkiraan geologi
    100 – Berlangsung
    N flank Moumoukai volcano
  15. 50 SMVEI 3Perkiraan geologi
    BCE 50 – Berlangsung
    Denham caldera?
  16. 250 SM (±75 tahun)VEI 6Perkiraan geologi
    BCE 250 – Berlangsung
    Denham caldera
  17. 1200 SM (±150 tahun)VEI 4Perkiraan geologi
    BCE 1200 – Berlangsung
    SW part of Raoul caldera
  18. 2000 SM (±100 tahun)VEI 4Perkiraan geologi
    BCE 2000 – Berlangsung
    SE Raoul caldera

Tautan eksternal

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