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Monowai (vulcano)

Monowai

Stratovulcano · New Zealand · 132 m (sottomarino)

Map view shows Monowai submarine volcano at the lower left, with subsidiary cones on its N flank. A large submarine caldera lies to the NE at the top-right. The contour interval is 100 m and the resolution of the bathymetry data is 25 m. The proprietary bathymetry data were obtained by scientists of the New Zealand National Institute of Water and Atmospheric Research (NIWA) during a 2005 New Zealand-American NOAA Ocean Explorer research expedition to the Kermadec-Tonga Arc.
Map view shows Monowai submarine volcano at the lower left, with subsidiary cones on its N flank. A large submarine caldera lies to the NE at the top-right. The contour interval is 100 m and the resolution of the bathymetry data is 25 m. The proprietary bathymetry data were obtained by scientists of the New Zealand National Institute of Water and Atmospheric Research (NIWA) during a 2005 New Zealand-American NOAA Ocean Explorer research expedition to the Kermadec-Tonga Arc. · Foto: Image courtesy of Ian Wright, 2005 (NIWA; http://oceanexplorer.noaa.gov/explorations/05fire). · Wikimedia Commons
Tipo
Stratovulcano
Paese
New Zealand
Regione
Tonga e Kermadec / Northern Kermadec Volcanic Arc
Altitudine
132 m (sottomarino)
Coordinate
-25.887, -177.188
Ultima eruzione
2014
Contesto tettonico
Subduction zone / Oceanic crust (< 15 km)
Forma vulcanica
Composite
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

Monowai, also known as Orion seamount, is a basaltic stratovolcano that rises from a depth of about 1,500 to within 100 m of the ocean surface about halfway between the Kermadec and Tonga island groups, at the southern end of the Tonga Ridge. Small cones occur on the N and W flanks, and an 8.5 x 11 km submarine caldera with a depth of more than 1,500 m lies to the NNE. Numerous eruptions have been identified using submarine acoustic signals since it was first recognized as a volcano in 1977. A shoal that had been reported in 1944 may have been a pumice raft or water disturbance due to degassing. Surface observations have included water discoloration, vigorous gas bubbling, and areas of upwelling water, sometimes accompanied by rumbling noises. It was named for one of the New Zealand Navy bathymetric survey ships that documented its morphology.

Sintesi da Wikipedia

Riassunto in inglese

Monowai Seamount is a volcanic seamount to the north of New Zealand. It is formed by a large caldera and a volcanic cone just south-southeast from the caldera. The volcanic cone rises to depths of up to 100 metres (330 ft) but its depth varies with ongoing volcanic activity, including sector collapses and the growth of lava domes. The seamount and its volcanism were discovered after 1877, but only in 1980 was it named "Monowai" after a research ship of the same name.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
1944~1951 · 1 eruzioni · VEI max. 01973~1980 · 4 eruzioni · VEI max. 11980~1987 · 3 eruzioni · VEI max. 01987~1994 · 2 eruzioni · VEI max. 01994~2002 · 5 eruzioni · VEI max. 02002~2009 · 6 eruzioni · VEI max. 02009~2016 · 6 eruzioni · VEI max. 119441958198019942009

Cronologia dettagliata

  1. 2016VEI 0Stima geologica
    2016-11-11 – 2016-11-12
  2. 2014VEI 1Osservata
    2014-01-01 – 2014-01-01
    Summit
  3. 2014VEI 0Osservata
    2014-10-16 – 2014-11-05
    Submarine
  4. 2012VEI 0Osservata
    2012-08-03 – 2012-08-19
    Submarine
  5. 2011VEI 0Osservata
    2011-05-17 – 2011-05-22
    Summit Crater
  6. 2009VEI 0Osservata
    2009-05-04 – 2009-12-16
  7. 2008VEI 0Osservata
    2008-02-08 – 2008-02-08
  8. 2006VEI 0Osservata
    2006-12-12 – 2007-11-04
  9. 2005VEI 0Osservata
    2005-03-02 – 2006-06-27
  10. 2003VEI 0Osservata
    2003-04-10 – 2004-09-16
  11. 2002VEI 0Osservata
    2002-05-24 – 2002-05-24
  12. 2002VEI 0Osservata
    2002-11-01 – 2002-11-24
  13. 1999VEI 0Osservata
    1999-06-06 – 1999-06-11
  14. 1997VEI 0Osservata
    1997-04-18 – 1997-04-21
  15. 1997VEI 0Osservata
    1997-12-15 – 1998-02-04
  16. 1996VEI 0Osservata
    1996-09-20 – 1996-09-22
  17. 1995VEI 0Osservata
    1995-11-27 – 1995-11-30
  18. 1990VEI 0Osservata
    1990-05-30 – 1991-03-25
  19. 1988VEI 0Osservata
    1988-09-08 – 1988-09-08
  20. 1986VEI 0Osservata
    1986-06-16 – 1986-06-16
  21. 1982VEI 0Osservata
    1982-05-16 – 1982-05-16
  22. 1980VEI 0Osservata
    1980-01-16 – 1980-01-16
  23. 1979VEI 1Osservata
    1979-02-16 – 1979-04-19
  24. 1978VEI 0Osservata
    1978-02-16 – 1978-07-16
  25. 1977VEI 0Osservata
    1977-04-16 – 1977-04-16
  26. 1977VEI 0Osservata
    1977-10-17 – 1977-10-27
  27. 1944VEI 0Stima geologica
    1944-07-02 – In corso

Link esterni

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