Rabaul caldera

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Rabaul caldera
Rabaul caldera from space.png
True-colour image of the Rabaul caldera from space. From left to right: Vulcan (twin cones), Rabalanakaia, Tavurvur.
Highest point
Elevation 688 m (2,257 ft) [1]
Listing List of volcanoes in Papua New Guinea
Coordinates 4°16′16″S152°12′11″E / 4.27111°S 152.20306°E / -4.27111; 152.20306 [1]
Geography
Geology
Formed by Subduction zone volcanism
Rock age ~1,400 years
Mountain type Pyroclastic shield/Caldera
Volcanic arc Bismarck volcanic arc
Last eruption August to September 2014 [1]

The Rabaul caldera, or Rabaul Volcano, is a large volcano on the tip of the Gazelle Peninsula in East New Britain, Papua New Guinea, and derives its name from the town of Rabaul inside the caldera. The caldera has many sub-vents, Tavurvur being the most well known for its devastating eruptions over Rabaul. The outer flanks of the highest peak, a 688-metre-high asymmetrical pyroclastic shield, are formed by thick pyroclastic flow deposits. [1] There is no sign of a pyroclastic shield along the rim of the caldera, making the location likely underwater, on the caldera's floor.

Contents

Tavurvur, a stratovolcano and a sub-vent of the caldera, is the most visibly active, continuously throwing ash. In 1994 it, and nearby Vulcan, erupted and devastated Rabaul; however, due to planning for such a catastrophe, the townsfolk were prepared and only five people were killed. One of the deaths was caused by lightning, a feature of volcanic ash clouds. [2] [3] [4]

In 1937, Vulcan and Tavurvur erupted simultaneously, killing 507 people. This event led to the founding of the Rabaul Volcano Observatory, which watches over the many active volcanoes in Papua New Guinea. [5] One eruption over several days in March 2008 released a plume of ash and water vapor that drifted northwest over the Bismarck Sea. [6]

Subsidiary features

Eruptions

July 2010 eruptions

After this eruption, GPS data showed deflation of Tavurvur cone. Seismicity was very low, and diffuse white plumes were emitted during 26–30 July. [11]

2013–14 eruptions

References

  1. 1 2 3 4 5 "Rabaul". Global Volcanism Program . Smithsonian Institution . Retrieved 2020-03-26.
  2. Simons, Paul (May 8, 2008). "Dirty thunderstorm shoots lightning from volcano". London: Times Online. Archived from the original on May 17, 2008. Retrieved 2009-01-09.
  3. Perkins, Sid (March 4, 2015). "Flash glass: Lightning inside volcanic ash plumes create glassy spherules". American Association for the Advancement of Science.
  4. Sample, Ian (3 December 2015). "Sky lights up over Sicily as Mount Etna's Voragine crater erupts". the Guardian. Retrieved 2015-12-03.
  5. Smithsonian Institution / SEAN (1989). Lindsay McClelland; Tom Simkin; Marjorie Summers; Elizabeth Nielsen; Thomas C. Stein (eds.). Global Volcanism 1975–1985. Prentice Hall, Englewood Cliffs NJ, and American Geophysical Union, Washington DC. pp.  180–189. ISBN   0-13-357203-X.
  6. "Rabaul Volcano, New Britain". NASA Earth Observatory. Archived from the original on 28 March 2008. Retrieved 20 March 2008.
  7. "Global Volcanism Program | Rabaul".
  8. 1 2 "Rabaul". 2 August 2011.
  9. "The Rabaul Eruption". USGS. 1994-09-23. Retrieved 2016-03-05.
  10. "Winds soften erupting volcano's impact". Online News. Australian Broadcasting Corporation. 8 October 2006. Archived from the original on 2008-04-20.
  11. "09/2010 (BGVN 35:09) After Months of Quiet, Ash-Bearing Eruptions on 23–25 July 2010". www.volcano.si.edu. September 2010. Retrieved 2011-10-05.
  12. "Global Volcanism Program | Rabaul".
  13. "PNG volcano Tavurvur eruption may disrupt Australian flights". news.com.au. 2014-08-29. Retrieved 2014-08-29.
  14. "Papua New Guinea's Tavurvur Volcano Erupts; Locals Evacuate, Flights Disrupted". abcnews.go.com. 2014-08-29. Retrieved 2014-08-29.

Images