Updated: 31/03/2017 : updated general observations, eruption history and added photo no. 5 and 6.
Type of activity observed:
After the eruption of the 17-18th February, and my visit of 25-26th February, activity at Anak Krakatau remain the same, or have declined slightly. A steady degassing plume could be observed throughout the 3 day visit, however no eruptions was observed. Lava-glow was not seen in the crater like was the case during February.
Another small observation, there is a fumarole that emits blue gas, just below the edge of the southern side of the summit. (see photo 4 and 5 right side of the photo, and photo 6) I have noticed this fumarole since 2013, and it has always been emitting a distinct blue gas. On the photo it can be seen that this gas is distinct in color opposed to the other vents on the summit, which emit more neutral white looking gases. The light blue color of the plume is thought to be caused by a high ratio of sulfuric acidaerosol. The location of this fumarole might actually be on top of the location of the 2007-2008 Southern Crater, which might be the (vent) location of eruptions that happened in March 2013 and October 2013. On next visit to Krakatau I will have a closer look at this fumarole/vent with the drone.
Correction from last trip report
As a few readers have pointed out, there is now a cone in the summit crater of Anak Krakatau, and probably not a lava-dome, which I wrote in the last trip report in February. The new cone does not seem to have changed since February, and no incandescence was seen during the nights.
Recent Eruption history
|Eruption events||Origin of Eruption||Eruption Characteristics||Links to documentation|
|2017 February||Central crater||Strombolian, lava flow SW flank||view article|
|2013 October||Central crater (or vent on S flank )||Strombolian||view article|
|2013 March||Northern crater (& vent on S flank)||Strombolian, Vulcanian||view article|
|2012 September||Central crater||Strombolian, lava flow SW and E flanks||view article|
|2012 April||Central crater||Strombolian||view article|
|2011 November||Central crater||Strombolian||view article|
|2011 June||Central crater||Strombolian, vulcanian||view article|
|2011 January||Central crater||Strombolian||view article|
|2010*||Central crater||Strombolian, Vulcanian||Tom Pfeiffer`s photos from November 2010 here|
|2009*||Central crater||Strombolian, Vulcanian||Tom Pfeiffer`s photos from July 2009: here|
|2008*||Southern crater (old)||Strombolian, lava flow SW flank||Photovolcanica from May 2008: here|
|2007*||Southern crater (old)||Strombolian, ash venting etc||Tom Pfeiffer`s photos from November 2007: here|
|* Eruption cycle lasted for month\s|
*Note: This is my own table of records and gathered sources, other eruption events may have occurred that I’m not aware of.
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