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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: restless (2 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), 2019-ongoing
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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Krakatau volcano news & eruption updates:

Krakatau volcano (Sunda Strait, Indonesia): increasing activity changes to strombolian

Mon, 30 Dec 2019, 16:17
16:17 PM | BY: T
Strombolian eruption at Krakatau yesterday (image: PVMBG)
Strombolian eruption at Krakatau yesterday (image: PVMBG)
Seismic activity at Krakatau during the past weeks (image: Magma Indonesia)
Seismic activity at Krakatau during the past weeks (image: Magma Indonesia)
The activity at the volcano has increased during the past days. Small to moderate explosive activity seems now to have become more frequent if not nearly continuous.
VAAC Darwin reports continuous ash emissions to 8,000-10,000 ft (2.4-3 km) altitude, generating a steam and ash plume drifting SW for several tens of kilometers.
A webcam image shows that at least some of the explosions now generate incandescent tephra, which suggests that the eruption dynamics is changing from surtseyan (water-magma interaction) to strombolian (no water interacting), probably as accumulated material from the eruptions has sealed off the vent, which used to be in a lake-filled crater. It also means that increased amounts of fresh magma are likely on the way to the surface now.
This also fits the observation of increased periods of volcanic tremor recorded by the seismic network.
As soon as the weather conditions allow, we plan to revisit the island group to inspect the new activity. If anyone is interested, please look at our Krakatau Volcano Special expedition page.
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