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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
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From Krakatau to Bali (16-days study and photo tour to Java, Indonesia)
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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:

Reconstruction of recent events: collapse, tsunami and regrowth of the Anak Krakatau island

Thursday Jan 03, 2019 09:30 AM | BY: T

Interpretation of the recent changes on Anak Krakatau by comparing several satellite images (source: Dongeng Geologi)
Interpretation of the recent changes on Anak Krakatau by comparing several satellite images (source: Dongeng Geologi)
The attached image compares several detailed satellite images taken before, immediately after the tsunami on 22 Dec 2018 as well two and five days later, and gives an interpretation of what caused the tsunami (= a collapse of the western lava benches).
Comparing the morphology of the island as seen on the pictures, a plausible reconstruction of events would be as follows:

22 Dec: part of the lava flow terrace that forms the western shores of Anak Krakatau collapse, probably involving a significant underwater volume. This caused the tsunami that hit the Java west coast around 21:30 local time.

23-24 Dec: additional collapses (but involving much less volume each) in combination with violent explosions remove more material from the island, eating away until the whole summit cone is gone (3rd picture).

25 Dec: heavy and very wet water-lava explosions deposit meters of fresh, wet ash and blocks all over the island, along with sea currents that wash the muddy material to shores. This way, the crescent-shaped island seen on the 27 Dec (and later) pictures with the open crater bay is formed. Significant land addition has extended the island's eastern shores (compare the satellite overlay image posted earlier).
Radial erosion gullies formed quickly as result of torrents of water carving down the loose material now covering the island. This water is both from a) heavy rains as well as b) ejected liquid and b) condensation of steam from the water-rich explosions (see video below).

Source: Teka Teki Gunung Anak Krakatau (Dongeng Geologi)

Video illustrating the violence of these explosions:
Previous news
Thursday, Jan 03, 2019
Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 35000 ft (10700 m) altitude or flight level 350 . ... [more]
Wednesday, Jan 02, 2019
Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ... [more]
Surtseyan explosion at Anak Krakatau yesterday (image: Doni Janskulo)
Wednesday, Jan 02, 2019
Here are some of the most terrifying explosions on Anak Krakatau recently filmed. Our correspondent Doni Janskulo from Kalianda, Lampung, took advantage of very clear views yesterday and managed to take some of the most extraordinary and dramatic footage yet of the explosions on collapsed Anak Krakatau island. ... [more]
Satellite image of Krakatau volcano on  2 Jan 2019
Wednesday, Jan 02, 2019
Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 35000 ft (10700 m) altitude or flight level 350 . ... [more]
Krakatoa volcano and a possible steam/ash plume this morning on Himawari-8 satellite image
Wednesday, Jan 02, 2019
Sometimes strong explosive activity seems to continue at the volcano: VAAC Darwin reported an ash plume that rose to 40,000 ft (12 km) altitude this morning as well as "regular, intermittent" emissions of volcanic ash to 35,000 ft (10 km). ... [more]

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