This caused the tsunami that hit the Java west coast around 21:30 local time.Ģ3-24 Dec: additional collapses (but involving much less volume each) in combination with violent explosions remove more material from the island, eating away until the whole summit cone is gone (3rd picture).Ģ5 Dec: heavy and very wet water-lava explosions deposit meters of fresh, wet ash and blocks all over the island, along with sea current that wash the muddy material to shores. Interpretation of the recent changes on Anak Krakatau by comparing several satellite images (source: Dongeng Geologi)The attached image compares several detailed satellite images taken before, immediately after the tsunami on as well two and five days later, and gives an interpretation of what caused the tsunami (= a collapse of the western lava benches).Ĭomparing the morphology of the island as seen on the pictures, a plausible reconstruction of events would be as follows:Ģ2 Dec: part of the lava flow terrace that forms the western shores of Anak Krakatau collapse, probably involving a significant underwater volume.
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