Krakatau volcano – February 2017

25-26th February

Published: 27th February 2017.

Updated: 16th March 2017.

Type of activity observed:

General observations

Anak Krakatau erupted in February, and sources state that the date of the eruption to be 17-18th February.  Thermal hot-spot data from Modis support this, as hot-spots was recorded on both days (see illustration 1.)

On arrival at Krakatau in the morning of the 25th February traces of the February eruption was seen observed. The eruption have resulted in a new lava-flow on the SE flank, exacly at the same place, as the September 2012 lava-flow (see photo no.1). The new layer of lava-flow is black, compared to the red color of the 2012 lava flow.  The lava flow has cooled down since the material was deposited. Fresh volcanic blocks were also seen distributed on the SE, S, E flank of Krakatau.

During my visit no eruptions of ash were observed. Anak Krakatau emitted a medium strong plume of gas, that incresed somewhat in strength on the 26th February.

Before the eruptive activity in February 2017, the last eruption at Krakatau that I know of was in October 2013

Summit Crater Area

After having studied aerial views of the crater area, it seems that the source vent of the new lava-flow, is the same vent (main, central vent) that was involved in the 2012 eruption. On the top of the vent, it now seems to be a lava-dome (see photo no.2). I also made a illustration to show the difference between the crater area of Anak Krakatau of October 2015 vs today. From the illustration it is easy to identify the lava-dome. (see illustration no.2).

Daytime observation showed focused gas emissions around the vent/dome.  The lava dome was visible from Verlaten isl. 3km away from Anak Krakatau. Nighttime observation from Verlaten isl. and aerial observation from above the vent, showed incandescence from the lava dome. The area containing incandescence was however small, and the lava dome did not appear to be overly active. From the physical shape of the dome, it looks like the dome may have been present from before the eruption or that it emerged during the eruption, because the dome looks partly collapsed leading in the direction of the recent lava-flow (see photo 3).

The main crater and summit area today seem to be of a more complex and dynamic character than it was before the eruption of September 2012. From footage of 2010/2011 the main crater was seen to be broad and fairly deep. Now the main crater is filled with material, with two lava flows originating from this vent running down on the SW and E flanks. On the northern side of the summit a eruption vent is also clearly observed. (see photo n.4). This vent was most likely involved in a eruption in March 2013.

Recent Eruption history

Eruption events Links
February 2017 (covered by this article)
October 2013: view article
March 2013: view article
September 2012 view article
2011: view article ǀ view article ǀ view article
2010: See for example Tom Pfeiffer`s photos from November 2010 here
2008:  Documented by Photovolcanica: here
Note: This is my own table of records, other eruption events may have occured that Im not aware of.

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Modis Krakatau eruption february 2017 andersen sunda strait
(illustration no.1)
Anak Krakatau Lava Flow 2017
Photo no.1, shows the lava flow of February 2017, on top of the September 2012 flow. The 2017 is distinct black, compared to the red color of the old lava flow.
Aerial Krakatau 2017 volcano sunda java andersen
Photo no.2. Close up of lava dome.
2017 Krakatau lava dome volcano andersen
Photo no.3
Krakatau crater 2017 lava flow andersen
Illustration no.2. Summit area of February 2017 vs 11th October 2015.
Aerial Krakatau crater 2017 dji volcano sunda java andersen
The northern vent is seen clearly on the middle-leftof this photo (photo no.4)

 

 

25-26th February

Photos: 26 available in this article. in format/size: RAW/DNG. More than 400 photos, including 100+ aerial photos not posted online.

Video:  1 video available on website. in format: HD 1080p. 1 hour aerial raw video not posted online.

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Purchase of Photos/Videos.

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Krakatau 2017 volcano sunda java andersen
Approaching Anak Krakatau. The new lava-flow of February 2017 on the SE flank, can be recognized as the black material on top of the more red colored lava flow of September 2012. (25th February 2017)
Krakatau 2017 volcano sunda java andersen
Close up of the lava-flows (25th February 2017)
Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
Close up of the Lava-dome (25th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
Lava dome seen from the West (25th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
The summit exposed. Apart from the central vent/dome, another vent is visible on the left (North) side. This went was active in March 2013. (25th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
(26th February 2017)
Aerial Krakatau 2017 dji volcano sunda java andersen
(26th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
(26th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
(26th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
(26th February 2017)
Aerial Krakatau 2017 volcano sunda java andersen
(26th February 2017)
Krakatau 2017 volcano sunda java andersen
Sunset, just before dark. Some incandescence on the side of the lava-dome (25th February 2017)
Krakatau 2017 volcano sunda java andersen
Incandescence visible troughout the whole night (25th February 2017)
Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Krakatau 2017 volcano sunda java andersen
(25th February 2017)
Krakatau 2017 volcano sunda java andersen
(26th February 2017)
Krakatau 2017 volcano sunda java andersen
(26th February 2017)

Video

Click to open video (youtube), please choose HD 1080 quality for best viewing.

krakatau volcano aerial video dji aerial 2017 crater lava
Video footage was collected 25-26th February 2017.

 

 

 

 

 

 

 

 

 

 

 

 

 



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