Anak-Krakatau 14-15th April 2018

14-15th April 2018

Published: 18th April 2018

 

Type of activity observed:

According to my knowledge there haven’t been any confirmed eruptive activity since last February 2017 (I covered the 2017 eruption in this article.) neither from PVMBG/MAGMA or locals that I have talked to who regularly visits the volcano. I visually compared photos of the summit area from 2017 with new ones acquired during this trip, and I did not see any physical evidence of any new activity since 2017.

During this visit it seemed that the visual activity level were approximately on the same levels as last year. The 3 crater-vents that have been the source of recent eruptions are still exposed (see photo 8.). Among them the Southern vent (see photo 18.) emit the most gas, and the central-vent (see photo 11) seem to emit less gas now than last year. Apart from that, other active fumarolic fields are also present on the summit. 

Earthquake 15th April

In the early hours of 15th April 01:02 local time, we were literally thrown out of sleep by a 5.0magnitude, 10km depth earthquake that had epicenter just a few km South of Krakatau. No obvious visual changes was seen at Anak.Krakatau after the earthquake, the following day.  A couple of guys in my group told me that they heard a rumbling noise a few moments after the earthquake, however that may have been a passing thunderstorm?.

Earthquake Krakatau Sunda Strait 15 april 2018 volcano
Earthquake quick facts
Seismogram Earthquake Krakatau Sunda Strait 15 april 2018 volcano
Seismogram showing the earthquake and subsequent seismic events following the EQ.

 

 

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

 

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Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 1. Anak-Krakatau cone seen from 3km distance.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi, drone, aerial
Photo 2. Looking toward the summit area. People walking on the old crater rim, below it.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi,drone, aerial
Photo 3. Summit area, with the Eastern flank lava flow of 2012/2017.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi, drone, aerial
Photo 4.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi, drone, aerial
Photo 5. Eastern flank lava flow of 2012/2017. The 2012 eruptive activity emplaced the largest volume, and the 2017 flow emplaced the black lava on top of the 2012 flow.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi, drone, aerial
Photo 6.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi, drone, aerial
Photo 7.
Krakatau volcano aerial summit crater illustration 2018
Photo 8. Northern- Central- and Southern-crater-vent
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 9.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 10. The central crater-vent
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 11. Close up on the central crater
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 12. The N crater, that was the source of eruption in March 2013.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 13. Verlaten Island (front) Lang Island (left) Anak-Krakatau (middle) and Rakata Island (right)
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 14. Active fumarolic field on the western part of the summit
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 15. Looking at the summit from the North-South. Rakata island in the background.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 16. Met another drone mid-air enroute Krakatau
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 17. Southern tip of the summit, with a crater-vent on the right-bottom of the frame.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 18. This vent emitted more gas during this visit than last year. I last witnessed a eruption from this vent in March 2013.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 19.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 20. Summit seen from the NW.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi, KM Tunul 02
Photo 21. Fishing boat (KM Tunul 02). The area seem to be thriving spot for fishermen, as we often encounter them in the waters of Krakatau.
Anak-Krakatau, Krakatau, April, 2018, Volcano, Indonesia, Gunungapi
Photo 22. During a thunderstorm, a couple of hours prior to the earthquake.

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