Krakatau Volcano Eruption 4-6 August 2018

4-6 August 2018

Published: 9th August

Updated: 27th August (added more drone photos)

Activity of the Volcano:

Arrival at the coast of Java (Carita) in the evening on the 4th August. Found a quiet spot along the seashore, and were able to observe Anak-Krakatau erupting in the Sunda-strait, 47km West of my position (See photo no.1). Loud eruption sounds (like the sound of thunder/distant canonfire) were heard more or less every minute or so. I observed the Volcano for around 45min from 23:45 local time (4th August) to 00:30 (5th August). During the night, the walls and windows of the building I was staying in (50km from Anak Krakatau), in the same area, was occasionally shaking. The visual view and sound of the eruption seen from Carita, were similar to the observation I did on the: 13th July 2018:  see this report

In the morning of the 5th August, the sound of the eruption from Krakatau was still occasionally heard from Carita, even tough there were now more noise pollution in the area I was situated.

Arrived at Rakata island on Krakatau at 09:30 in the morning (5th August). Rakata isl. is located 4km South of the active Anak-Krakatau cone, and is outside the current restriction/danger zone set by the Indonesian Authorities. The restriction/danger zone for Anak-Krakatau is currently (as of 8th August) at 2km from the summit-crater, recommended by the Indonesian `Center for Volcanology and Geological Hazard Mitigation`(PVMBG).

Anak-Krakatau was in a state of continuous eruption (Strombolian?). The sound of the eruption was similar to the sound heard from the coast of Java observed the night before, but naturally louder. The new eruption phase that according to Indonesian Authorities (PVMBG) started in June 2018, seem to have resulted in a new cone forming on the southern side of the summit of Anak-krakatau. During my flyover with a drone in April 2018, only a small vent was present on the Southern side of the summit (see photos here). The new cone vent looks to have increased the height of Anak-krakatau by a few to tens of meters. I would characterize the eruption as sustained pulsing explosions, relatively ash-rich, with the occasional larger explosions in between.  The eruption plume reached heights of maybe 1000m and drifted East/Northeast most of the day (see photo no. 12). The majority of the ash must have been course, since the initial dark grey ash-rich plume was almost white in color when it had reached its max-altitude (see photo 8), meaning the coarse ash mostly fell on and in the immidiate vicinity of Anak-Krakatau. The eruption also produced a large amount of lava-bombs. The largest explosions produced the most lava bombs, ejecting them to heights of maybe up to 400m above Anak-Krakatau. Some reached the sea on the Southern side of Anak-Karkatau, but the majority landed on the volcano itself.  The eruption have also created a small lava-flow on the Southern flank of Anak-Krakatau (see photo 2, 3 & 7).  The lava-flow had reached the ocean before my arrival, and was evident by a white plume of water vapor rising 50-100m above the point of contact by the seashore. Small explosions were sometimes observed where the lava made contact with the sea. On nightfall,the lava flow on the Southern  flank was glowing, formed by what seemed to be accumulation of more hot looking fluid lava. The hot more fluid looking lava was even visual during the day during my flyover with a drone (see photo 48 & 51 ), especially the upper more narrow part of the flow. (see photo 21 & 25).

At around 17:00 (5th August) in the afternoon the explosions became less ash-rich. The individual explosions became more easy to differentiate, the time between the explosions were in the range 1-30 seconds, with the majority only seconds in between. Some explosions were larger than the majority, and seemed to arrive after the longest period of calm in between. Even the largest explosions after 17:00 in the afternoon did not produce as much ash as earlier in the day. The less ash-rich explosions in the afternoon created larger eruption sounds than the ash-rich explosions, was my impression.  During the night this activity continued, with explosions every 1-30 seconds. In the morning activity seemed to have decreased, both the frequency and size of the explosions. Looking at the seismigram of the 6th August (see Seismogram nr.2 below), seismicity also seem to confirm a decrease in activity at Anak-Krakatau during 6th August.

The eruptive activity I observed at Anak-Krakatau during this visit was similar to the 2012 eruption that I observed.Both the 2012 and 2018 activity I observed  was characterized by continuous explosions and both emplaced lava-flows. The 2012 lava-flows were however much larger and more significant than the 2018 lava flow, at the time of writing. 

For reference see also: Image below captured by Sentinel 2,  on the 6th August.

 

Important Note: This is my personal notes, and should not be considered as Official information regarding the volcano or its activity. For updated information and official statements on the volcanic activity of Krakatau Volcano, visit the Indonesian authorities website MAGMA Indonesia. and Center for Volcanology and Geological Hazard Mitigation`(PVMBG).  On Twitter (@id_magma and @vulkanologi_mbg)

The restriction/danger zone for Anak-Krakatau is currently (as of 8th August) at 2km from the summit-crater, recommended by the Indonesian `Center for Volcanology and Geological Hazard Mitigation`(PVMBG).

All photos and videos in this article and obtained during this trip, including the drone footage –  was acquired from outside the restriction/danger zone of 2km radius from Anak Krakatau. It is very important to observe these safety recommendations given by Indonesian Authorities.

 

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Total photos in this article: 54. (Available in Jpg/Raw.). (400+ photos not published)

Total videos:4. (Available in 4K). (More than 180min video not published)

Photos and Videos published are available for purchase. If you want to purchase photos or videos, please see this page

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Seismogram

The seismograms have been aquired from MAGMA Indonesia

Krakatau volcano seismogram 2018 august
1. Seismogram 5-6th August 2018

 

Krakatau volcano seismogram 2018 august
2. Seismogram 6th August 2018

 

Satelite image of 6th August (Sentinel image)

Krakatau Krakatoa Sentinel image august 2018 Indonesia volcano

Photos – 5-6th August

Krakatau from dari anyer volcano krakatoa volcano indonesia
1. Anak-Krakatau here seen erupting, 47km from the coast of Java, 01:00 local time on the 5th August.
Krakatau volcano eruption explosion 2018 strombolian indonesia lava-flow
Photo 2. Arrival to Krakatau in the morning. A sustained plume can be seen being emitted from Anak-Krakatau- Continous explosions were heard.
Krakatau volcano eruption explosion 2018 strombolian indonesia lava-flow
Photo 3. Rising steam from the point of contact between a lava-flow with the sea.
Krakatau volcano eruption explosion 2018 strombolian indonesia lava-flow
Photo 4. Zoom onto the summit from the S/E.
Krakatau volcano eruption explosion 2018 strombolian indonesia lava-flow
Photo 5. A narrow flow of hot more fluid looking lava, seem to be feeding the lower part of the lava-flow that came in contact with the sea.
Krakatau volcano eruption explosion 2018 strombolian indonesia lava-flow
Photo 6.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 7. The point where the lava-flow came in contact with the sea.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 8.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 9.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 10.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 11.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 12.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 13.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 14.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 15.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 16.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 17. Tons of lava bombs being ejected from the crater in this explosion.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 18.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 19.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 20. In this photo taken 17:15 in the afternoon, dust seem to have been whipped up as chunks of hot lava rolled down the flank.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 21.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 22. A comfortable Catamaran (Lagoon) boat anchored up outside Rakata in the afternoon.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 23. As the evening arrives (18:01 local time), the red color of the hot lava-bombs becomes more visual.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 24. The explosions in the afternoon became less ash-rich than earlier in the day.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 25. The lava flow channel is easily recognizable in this photo.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 26.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 27.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 28. Explosion have just occurred and the ejecta is still gaining altitude.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 29. Larger explosion sending lava-bombs to heights above 300m above the summit.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 30.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 31.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 32. The eruption and continous ejection of lava is feeding the lava-flow.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 33. Close up on a big-explosion.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 34.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 35.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 36.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 37. Some far reaching lava-bombs.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 38. Morning arrives. The activity Level have decreased slightly, but explosions continue to occur, however without much ash.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 39.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 40.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 41.
Krakatau volcano eruption explosion august 2018 strombolian indonesia lava-flow
Photo 42.

Drone Photos

Important note: All drone footage –  was acquired from outside the restriction/danger zone of 2km radius from Anak Krakatau. It is very important to observe these safety recommendations given by Indonesian Authorities.

Krakatau volcano Drone Eruption 2018 aerial Krakatau
Photo 43. Aerial over the Ocean South of Anak-Krakatau. Anak-Krakatau is emitting a eruption plume that are drifting East, over Lang Island
Krakatau volcano Drone Eruption 2018 aerial Krakatau
Photo 44. Up Close With the eruption column. As you can see the eruption produce a lot of lava-bombs and Ash.
Krakatau volcano Drone Eruption 2018 aerial Krakatau
Photo 45.
Krakatau volcano Drone Eruption 2018 aerial Krakatau
Photo 46.
Krakatau Volcano Eruption Drone DJI August 2018 Indonesia Krakatoa
Photo 47.
Krakatau volcano Drone Eruption 2018 aerial Krakatau
Photo 48. The lava-flow seen from above. The white steam plume occurrs as hot lava gets in contact with seawater.
Krakatau volcano Drone Eruption 2018 aerial Krakatau
Photo 49. Close up on the active lava-flow.
Krakatau Volcano Eruption Drone DJI August 2018 Indonesia Krakatoa
Photo 50.
Krakatau volcano Drone Eruption 2018 aerial Krakatau
Photo 51.
Krakatau Volcano Eruption Drone DJI August 2018 Indonesia Krakatoa
Photo 52.
Krakatau Volcano Eruption Drone DJI August 2018 Indonesia Krakatoa
Photo 53. The lava bombs area clearly very hot, as you can see the red color even it was daylight.
Krakatau volcano Drone Eruption 2018 aerial Krakatau
Photo 54.
Krakatau volcano Drone Eruption 2018 aerial Krakatau
Photo 55. Hot red lava can be observed in this photo.

Videos 

 



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