Indonesia Tsunami Caused By Volcano Collapse

Krakatoa or Krakatau is a volcanic island situated in the Sunda Strait between the islands of Java and Sumatra in the Indonesian province of Lampung. The name is also used for the surrounding island group comprising the remnants of a much larger island of three volcanic peaks which were obliterated in a cataclysmic 1883 eruption. The most notable eruptions of Krakatoa culminated in a series of massive explosions over 26–27 August 1883, which were among the most violent volcanic events in recorded history. With an estimated Volcanic Explosivity Index of 6, the eruption was equivalent to 200 megatons of TNT (840 PJ)—about 13,000 times the nuclear yield of the Little Boy bomb (13 to 16 kt) that devastated Hiroshima, Japan, during World War II, and four times the yield of Tsar Bomba (50 Mt), the most powerful nuclear device ever detonated. According to the official records of the Dutch East Indies colony, 165 villages and towns were destroyed near Krakatoa, and 132 were seriously damaged. At least 36,417 people died, and many more thousands were injured, mostly from the tsunamis that followed the explosion. The eruption destroyed two-thirds of the island of Krakatoa. In 1927, a new island, Anak Krakatau, or “Child of Krakatoa,” emerged from the caldera formed in 1883 and is the current location of eruptive activity. Periodic eruptions have continued since, with recent eruptions in 2009, 2010, 2011, and 2012. In late 2011, this island had a radius of roughly 2 kilometres (1.2 mi), and the highest point of about 324 metres (1,063 ft) above sea level, growing 5 metres (16 ft) each year. In 2017 the height of Anak Krakatau was reported as over 400 metres above sea level.

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https://www.theguardian.com/world/2018/dec/24/sunda-strait-tsunami-volcano-indonesia