This week's USGS/Smithsonian GVP Volcano Update!
- 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).
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:
and a more recent (2007) abstract by Belousov and Belousova is here:
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.
There are also (2) avi files of the vent degassing (with audio) under the "Noticias y Eventos" section in the center of their homepage.
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