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Krakatau volcano
Caldera 813 m (2,667 ft.) / Anak Krakatau: 189 m
Sunda Strait, Indonesia, -6.1°S / 105.42°E
Current status: minor activity or eruption warning (3 out of 5)
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Krakatau volcano eruptions:
1530, 1680-81, 1684, 1883 (Plinian eruption), 1927-30, 1931-32, 1932-34, 1935, 1936, 1937, 1938-40, 1941, 1942, 1943, 1944, 1945, 1946, 1946-47, 1949, 1950, 1952, 1953, 1955, 1958-59, 1959-63, 1965(?), 1969(?), 1972-73, 1975, 1978, 1979, 1980, 1981, 1988, 1992-93, 1994-95, 1996, 1997, 1999, 2000, 2001, 2007-8, April 2009-early 2010, Oct 2010 - March 2011, July-Oct 2011, Jan-May + Sep 2012, 2015(?), 2017, 2018 (22 Dec eruption & tsunami)
Typical eruption style:
Explosive. Construction of a cinder cone  island (Anak Krakatau) inside the caldera formed by the 1883 eruption. Frequent strombolian activity.
Last earthquakes nearby
Krakatau volcano tours
From Krakatau to Bali (16-days study and photo tour to Java, Indonesia)
A Dream Come True - World Volcano Tour (4 weeks round-the-world trip to Hawai'i - Vanuatu - New Zealand - Indonesia)
Krakatau Volcano Special (expedition to study & observe Anak Krakatau volcano and its activity)

Latest satellite images

Sentinel hub | Landsat 8

Krakatoa (Krakatau) volcano news & eruption updates:

Krakatoa volcano (Sunda Strait, Indonesia): new satellite imagery reveal both rapid land loss and growth of Anak Krakatau in detail

Sunday Dec 30, 2018 21:13 PM | BY: T

Comparison of Anak Krakatau's coast line seen on 29 Dec with a satellite image before the eruption (26 Nov 2018) (image: Sentinel-2 / ESA)
Comparison of Anak Krakatau's coast line seen on 29 Dec with a satellite image before the eruption (26 Nov 2018) (image: Sentinel-2 / ESA)
Satellite image of Anak Krakatau on 29 Dec 2018 (image: Sentinel-2 / ESA)
Satellite image of Anak Krakatau on 29 Dec 2018 (image: Sentinel-2 / ESA)
A new high-resolution satellite image taken yesterday allows an update on the dramatic effects the 22 Dec collapse has had on Anak Krakatau island:
It shows that actually not all, but most of the summit cone is now missing as well as significant parts of the western and southern shores previously formed by young lava deltas. On the other side, there has been a significant enlargement of the coast on the eastern shore.
This poses several big questions (we cannot answer at this point):
1) How much of the enlargement of the coast occurred by debris flows from the collapse(s) itself (if any traveled towards the east and not only SW down into the sea); and
2) how much of it might have been added by a) the violent explosive activity during the following days, and/or b) how much of it can be attributed to sea currents washing loose material deposited into the sea back to shore ?
The latter is likely to be significant, as the coasts in the eastern parts of Anak Krakatau are very shallow, and large amounts of mud can be seen floating around Anak Krakatau in the satellit image.

3) Another question is how large was the collapse that actually led to the generation of the tsunami? Was it only one? - did the summit cone collapse in one go, or did several collapses occur? The latter idea might explain that there were two tsunami waves observed, the first being relatively small, the second one following after a few minutes (but not immediately) and much higher.

At the moment, as mentioned, we can not give answers. But at least some of them could be given by doing more research and, first of all, by detailed ground observations. We hope our team on location around our expedition leader Andi will be soon able to visit the island from close and bring us more information.

Previous news

Sunday, Dec 30, 2018
On 17 Oct, explosions were particularly violent at Anak Krakatau. We show a series of images of a spectacular explosion captured from close range by boat. 2 months later, the cone of Anak Krakatau collapsed into the sea on the evening of 22 Dec 2018, triggering a catastrophic tsunami (more info). ... [more]
Krakatoa seen yesterday from the coast - Anak Krakatau is no longer visible, only small ash and steam plumes rising from behind Sertung (image: VSI webcam)
Saturday, Dec 29, 2018
The activity at the volcano continues at reduced rate. Steam explosions have been more intermittent and smaller during the past 2 days, generating plumes that rose a few hundred meters only. ... [more]
Friday, Dec 28, 2018
After almost 6 days of an almost non-stop ash plume to 55,000ft following the devastating collapse, Darwin VAAC reports that activity has finally subsided with only very minor emissions. No updates about local conditions at the moment. [more]
Krakatau with steam explosions seen yesterday (image:  Sutopo Purwo Nugroho @Sutopo_PN / twitter)
Thursday, Dec 27, 2018
The violent explosive activity caused by magma-water interaction continues at the volcano, from the area where the summit cone collapsed on 22 Dec and now exposes the vent to sea water. ... [more]
Exaggerated  cross section and bathymetry of the Krakatau caldera, showing the flank collapse modeled in 2012 (image: Giachetti et al, 2012)
Tuesday, Dec 25, 2018
Sometimes, science has already answers for tragic events, but their voice is not heard or underestimated at the time. The Indonesia tsunami disaster two days ago is such an example: What happened on 22 Dec 2018 had actually already been described and warned about for years in amazing detail: ... [more]

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