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Raoul

Raoul Island

Estratovolcán · 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
Estratovolcán
País
New Zealand
Región
Tonga-Kermadec Volcanic Regions / Northern Kermadec Volcanic Arc
Altitud
516 m
Coordenadas
-29.270, -177.920
Última erupción
2006
Contexto tectónico
Subduction zone / Oceanic crust (< 15 km)
Forma volcánica
Composite
Roca principal
Andesite / Basaltic Andesite
Resumen geológico

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.

Resumen de Wikipedia

Resumen en inglés

Raoul Island is the largest and northernmost of the main Kermadec Islands, 900 km south south-west of 'Ata Island of Tonga and 1,100 km north north-east of New Zealand's North Island. It has been the source of vigorous volcanic activity during the past several thousand years that was dominated by dacitic explosive eruptions, with the largest being VEI-6.

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Historial de erupciones

Resumen (VEI en el tiempo)
Haga clic en una barra para ver erupciones individuales
2000 BCE~1809 BCE · 1 erupciones · VEI máx. 41237 BCE~1046 BCE · 1 erupciones · VEI máx. 4283 BCE~92 BCE · 1 erupciones · VEI máx. 692 BCE~98 · 1 erupciones · VEI máx. 398~289 · 1 erupciones · VEI máx. 4289~480 · 1 erupciones · VEI máx. 4480~671 · 1 erupciones · VEI máx. 4671~861 · 2 erupciones · VEI máx. 41434~1624 · 1 erupciones · VEI máx. ?1624~1815 · 3 erupciones · VEI máx. 41815~2006 · 5 erupciones · VEI máx. 32000 BCE1046 BCE92 BCE8611815

Línea de tiempo detallada

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

Enlaces externos

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