Eruptions

This week’s USGS/Smithsonian GVP Volcano Update!

Highlights include:

  • A volcano I had never heard of in the Kuril islands is showing signs of life: Kharimkotan. Satellite images show a thermal anomaly at the summit of the volcano – its last known eruption was in 1933.
  • Ash, sulfur dioxide and steam continue to erupt from Nyamuragira in the Congo, although lava flows have abated.
  • Crater C at Arenal had sporadic strombolian activity – which is par for the course for the Costa Rican volcano.
  • I must have missed this, but since December 14, the ash erupted at Gaua in Vanuatu has become denser and darker – and is still being emitted.
  • Increased fumarolic activity was spotted at Planchon-Peteroa in Chile, but this apparently common in the height of summer (in the southern hemisphere).

Comments

  1. #1 Boris Behncke
    January 21, 2010

    Kharimkotan (or Harimkotan) is a small but interesting volcano, because during its 1933 eruption there was a large sector collapse producing a debris avalanche that rushed into the sea and generated a tsunami. Luckily this happened in a rather sparsely populated area. There is a short article by Belousova and Belousov(in pdf) available on the Internet:
    http://www.kscnet.ru/ivs/bibl/vulk/xarimk/harimkotan.pdf
    and a more recent (2007) abstract by Belousov and Belousova is here:
    http://adsabs.harvard.edu/abs/2007AGUFM.V31E0711B
    The 1933 collapse was followed by a Plinian eruption and finally a lava dome grew within the collapse amphitheater. There has been no eruption at this volcano since then.

  2. #2 doug mcl
    January 21, 2010

    The description (and photo) of Karimkotan reads like a history and/or prediction for Mt. St. Helens

  3. #3 Doug C.
    January 22, 2010

    OVSICORI has posted a PDF dated Jan 20 that describes (with a nice photo) a robust or vigorous column of gas and vapor coming out of the “Nueva Abertura” at Turrialba.
    http://www.ovsicori.una.ac.cr/informes_prensa/2010/BoletinVTurrialba200110.pdf

    There are also (2) avi files of the vent degassing (with audio) under the “Noticias y Eventos” section in the center of their homepage.
    http://www.ovsicori.una.ac.cr/

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