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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.
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Krakatoa (Krakatau) volcano news & eruption updates:

Krakatoa volcano (Sunda Strait, Indonesia): strong eruptive phase, tsunami hits West Coast of Java

Saturday Dec 22, 2018 22:47 PM | BY: T

Lava flows entering the sea and lava fountaining from Anak Krakatau this evening (22 Dec 2018; image: Øystein Lund Andersen / facebook)
Lava flows entering the sea and lava fountaining from Anak Krakatau this evening (22 Dec 2018; image: Øystein Lund Andersen / facebook)
Tsunami entering the coast of Anyer 22 Dec 2018 (image: Øystein Lund Andersen / facebook)
Tsunami entering the coast of Anyer 22 Dec 2018 (image: Øystein Lund Andersen / facebook)
[Update 4]:
According to the latest information, 43 people died, 584 were injured and two persons are still missing persons from last evening's tsunami on Java's west coast. In addition, 430 houses and 9 hotels were heavily damaged according to information from PNBG.

The current eruptive phase of the volcano seems to be in fact rather strong. A new lava flow is reaching the sea and strong explosive activity, likely pulsating lava fountains are occurring at the summit vent.
Our friend Øystein Lund Andersen reported that a small tsunami, possibly caused by stronger explosions from the volcano, hit the west coast of Java near Anyer, where we was on the evening of 22 Dec observing the volcano. A first wave traveled 15-20 m inland and was followed by another (stronger) one that invaded the street and buildings near the coast. According to his report, it drowned cars, injured and possibly killed an unknown number of people. However, not much other news have reported a major incident, so it might have been not as severe as reported, fortunately.
UPDATE: another possibility is that the waves were unusually strong spring tide waves; there is no official confirmation for a tsunami to have occurred (yet).
2nd UPDATE: more news is slowly emerging. Unfortunately, it seems that indeed the waves were a tsunami and caused at least 20 fatalities, according to BCC, referring to Indonesian governmental sources.
3rd UPDATE:
Indonesia's Civil Protection Agency (BNPG) has officially announced that a tsunami has occurred and hit several coastal areas in the Sunda Strait, including on the coast in Pandeglang, Serang, and South Lampung Regencies. The tsunami occurred on 12/22/2018 around 9:27 p.m. WIB.
According to them, the tsunami was not caused by earthquakes (as no tectonic activity was detected), but most likely by an underwater landslide of accumulated sediments giving way. Whether it was caused by the eruption of Krakatoa and where exactly is still unclear. Its size also may have been increased by the influence of the full moon spring tide.
The Geological Agency detected that the start of the current paroxysm of the volcano began at 21:03 WIB local time. It damaged the local seismic station (probably it was hit by lava bombs).
The full impact of the tsunami is still unclear, but preliminary data indicate 20 people died and 165 people were injured; 2 people were missing and dozens of buildings were damaged. Unfortunately, the number of victims is likely to continue to grow considering that it is still night in Indonesia and not all areas have been investigated.
People are encouraged to remain calm and avoid the coast of the Sunda Strait for a while. BMKG and the Geology Agency are still conducting further research.

Below is Øystein's original post:
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Links / Sources:
Previous news
Saturated seismic signal at Krakatau this morning, showing strong tremor and continuous explosions (image: Krakatau volcano observatory via Galih Jati / VolcanoDiscovery)
Saturday, Dec 22, 2018
Another strong eruptive phase (paroxysm) is currently going on at the volcano. ... [more]
Saturday, Dec 22, 2018
Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ... [more]
Satellite image of Krakatau volcano on 20 Dec 2018
Thursday, Dec 20, 2018
Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ... [more]
Thursday, Dec 20, 2018
Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ... [more]
Seismicity at Krakatau during the past months (image: Magma Indonesia)
Wednesday, Dec 19, 2018
Mild eruptive activity continues. A weak to moderate thermal signal is recorded on satellite data and seismicity remains elevated. [more]

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