SI/USGS Weekly Volcano Activity Report for 11/25-12/1/2009

We get a new update from the Smithsonian/USGS Global Volcanism Program ...

Highlights (not counting Soufriere Hills or Gaua) include:

  • The Weekly Report mentions the mystery eruption/noneruption of Karkar in PNG. Specifically, they report:

    The report also stated that ash had merged with a thunderstorm cloud and had become unidentifiable.

    Two ash plumes (11/25, 26) that reached at least 9.1 km / 30,000 feet were reported by the Darwin VAAC ... but as we know, it is far from clear that anything actually happened at Karkar last week.

  • Activity has quieted significantly at Chaiten in Chile, with only a "diffuse plume" from the dome complex that started forming in May 2008.
  • Karymsky, a recent MVP, produced a ~3.8 km / 12,000 foot ash column as its eruptive activity continued.
  • Ecuador's Sangay produced two ash plumes over the last week, one reaching as high as 7.9 km / 26,000 feet according to reports from pilots in the area.
  • Rabaul in PNG was busy shaking windows 20 km from the volcano as the Tavurvur cone produced a number of explosions, along with ash and an incandescent glow at the crater.

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Last week, I reported that Karkar in Papua New Guinea had erupted. This was based on reports from Volcano Live and from the Darwin VAAC that said the volcano had produced at least 1, maybe 2, ~13 km / 45,000 foot ash columns. That is not a trivial ash column - you would think a large eruption was…

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