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First estimates of the impact of the tsunami-causing landslide / VolcanoDiscovery



19659018 ] Krakatau, a small group of islands in the Sunda Strait between the islands of Sumatra and Java, is one of the most famous volcanoes in the world, e a mostly submerged caldera with 3 outer marginal islands and a new c One of them, Anak Krakatau, which since 1927 forms a new island and is still very active.

Krakatau exploded spectacularly in a devastating Plinian eruption in 1883, killing more than 30,000 people (mainly due to the giant tsunamis triggered by the eruption). The outbreak was one of the first global news events after telegraph lines connected the various continents.

Caldera 813 m / 2,667 ft. / Anak Krakatau: 189 m
Sunda Strait, Indonesia, -6.1 ° S / 105.42 ° E
Current status : Eruption [19659020] (4 of 5)
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Volcanic eruptions from Krakatoa:
1530, 1680-81, 1684, 1883 (Plinian Eruption), 1927-30, 1931-32, 1932-34, 1935, 1936, 1936, 1938-40 , 1941, 1942, 1943, 1944, 1945, 1946, 1946-47, 1949, 1950, 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, October 2010 – March 2011, July-October 2011, Jan-Mai + Sep. 2012, 2015 (?), 2017, 2018 (outbreak of 22 December and tsunami)
Typical outbreak type:
Explosives. Construction of an ash cone island (Anak Krakatau) within the caldera formed by the eruption of 1883. Strombolian activities.
Recent earthquakes near

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Latest satellite imagery

  Krakatoa's seismicity in recent weeks (Image: VSI) [19659038] Krakatoa seismicity in recent weeks (Photo: VSI) </p>
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<p>  Volcano activity continues at a slower pace. The steam explosions were more and less strong in the last two days and produced feathers that rose only a few hundred meters.<br />
<br /> This trend corresponds to the seismic signals that have decreased significantly since the increase in the magma supply that led to the paroxysm in the period 21-22 December, causing much new lava to accumulate. This could in turn be "the last straw that breaks the camel's back", d. H. The additional sudden weight on the slopes and / or the shaking caused by the continuous explosions could have been the last trigger for the landslide.<br />
<br /> The Indonesian Center for Volcanology and Geological Disaster Risk Reduction (PVMBG) published a first official estimate of the effects of the landslide:<br />
<br /> – The original 338-meter-high summit of Anak Krakatau is now reduced to just 110 meters. H. The largest part of the summit cone has actually disappeared.<br />
<br /> – As a result, the island of Anak Krakatau is no longer visible from the mainland, as the island of Panjang (Long Island) blocks the view from the west coast of Java.<br />
<br /> – The volume of the collapse is estimated at 150 to 180 million cubic meters, while the remaining volume is currently estimated at 40 to 70 million cubic meters.<br />
<br /> – For this reason, the risk of other massive landslides and tsunamis is currently considered low unless tectonic faults in the area of ​​the Sunda Strait are activated.</p>
<p><b>  What's next? </b><br />
<br />  However, it is likely that the current eruption continues and is currently only in a low activity phase; If the cyclical pattern of increased supply continues every few weeks, another phase of stronger activity in January would not be surprising. </p>
<p>  — <br /><b>  Links / Sources: </b></p>
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