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Krakatau volcano (Indonesia): vulcanian explosions - field report 13-19 Oct 2018

Sat, 20 Oct 2018, 10:35
10:35 AM | BY: T
Vulcanian eruption at Krakatau on the evening of 13 Oct 2018 (image: Tom Pfeiffer / VolcanoDiscovery)
Vulcanian eruption at Krakatau on the evening of 13 Oct 2018 (image: Tom Pfeiffer / VolcanoDiscovery)
Vulcanian explosion during the morning of 17 Oct 2018 (image: Tom Pfeiffer / VolcanoDiscovery)
Vulcanian explosion during the morning of 17 Oct 2018 (image: Tom Pfeiffer / VolcanoDiscovery)
Mild strombolian activity in the evening of 14 Oct 2018 (Tom Pfeiffer / VolcanoDiscovery)
Mild strombolian activity in the evening of 14 Oct 2018 (Tom Pfeiffer / VolcanoDiscovery)
A small group of VolcanoDiscovery stayed on the island group during a Volcano Special tour from 13-19 Oct: the volcano's activity during this time fluctuated between phases of mild to strong ash venting along with occasional strombolian activity, as well as intermittent powerful vulcanian-type explosions.
The latter often occurred in series lasting 4 to approx 20 hours and at intervals ranging from 20 minutes to 3 hours. They typically generated loud detonation sounds, ejected bombs to heights up to 600-800 m or more, sometimes reaching the shores of Anak Krakatau and even the sea. Ash plumes rose approx. 2-3 km, and often showed frequent small lightnings.
No lava flows were active during our stay at the volcano, but there have been spots with constant glow along the line of the mid-September lava flow on the southern slope.
Interestingly, the recent (and still ongoing) eruptive phase has constructed a new cone that filled the old summit crater almost completely, except the eastern rim, which remains as a break in slope of the new cone. We estimate that the height of Anak Krakatau increased by approx. 25-30 percent as a result, now probably about 450 m tall.
The vulcanian explosions were particularly intense during the night 13-14 Oct, the evening of 15 Oct and the night 16-17 Oct until the next morning. In the afternoon of 17 Oct, a particularly violent explosion occurred that excavated a pit crater beneath the southern lid of the crater, at the same location the September lava flow had overspilled from the crater. By 19 Oct, this new pit had merged with the main crater, enlarging it.
Link: Photos and video from the expedition

Previous news

Wed, 17 Oct 2018, 06:00

Krakatau volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 17 October-23 October 2018 (Continuing Activity)

Based on satellite data, the Darwin VAAC reported that during 17-19 October ash plumes from Anak Krakatau rose to altitudes of 1.5-2.4 km (5,000-8,000 ft) a.s.l. and drifted in multiple directions. The Alert Level remained at 2 (on a scale of 1-4); residents and visitors were warned not to approach the volcano within 2 km of the crater. ... Read all
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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: erupting (4 out of 5) 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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Java (Indonesia)
From Krakatau to Bali
16-day study and photo tour to Java, Indonesia
16 days / 15 nights - Easy to Moderate
Price 3180 €
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expedition to study & observe Anak Krakatau volcano and its activity
3 -7 days - Easy
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