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).
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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.
The description (and photo) of Karimkotan reads like a history and/or prediction for Mt. St. Helens
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/BoletinVTurrialba200…
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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