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Raoul Island

Stratovulcano · 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
Tipo
Stratovulcano
Paese
New Zealand
Regione
Tonga-Kermadec Volcanic Regions / Northern Kermadec Volcanic Arc
Altitudine
516 m
Coordinate
-29.270, -177.920
Ultima eruzione
2006
Contesto tettonico
Subduction zone / Oceanic crust (< 15 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

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.

Sintesi da Wikipedia

L'isola di Raoul, nota in passato come Sunday Island, è un'isola neozelandese facente parte dell'arcipelago delle isole Kermadec delle quali costituisce la più settentrionale e la più grande. Essa costituisce il bordo emerso di un vulcano entrato in eruzione per l'ultima volta il 17 marzo del 2006 facendo una vittima e provocando l'evacuazione della stazione meteorologica dell'isola.

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
2000 BCE~1809 BCE · 1 eruzioni · VEI max. 41237 BCE~1046 BCE · 1 eruzioni · VEI max. 4283 BCE~92 BCE · 1 eruzioni · VEI max. 692 BCE~98 · 1 eruzioni · VEI max. 398~289 · 1 eruzioni · VEI max. 4289~480 · 1 eruzioni · VEI max. 4480~671 · 1 eruzioni · VEI max. 4671~861 · 2 eruzioni · VEI max. 41434~1624 · 1 eruzioni · VEI max. ?1624~1815 · 3 eruzioni · VEI max. 41815~2006 · 5 eruzioni · VEI max. 32000 BCE1046 BCE92 BCE8611815

Cronologia dettagliata

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

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