![]() ![]() The tsunami is thought to have been caused by the eruption of the Anak Krakatoa volcano, which may have triggered underwater landslides.Here is an explanation as to why that was. The tsunami hit at about 9.20pm on Saturday night.In shallow water the energy of the tsunami is quickly dispersed and so in this case the wave didn’t travel as far from source as the very destructive 2004 Boxing Day tsunami which occurred in the deep ocean. These tsunamis are very localised and to cover the Indian Ocean with sufficient sensors to warn against all such eventualities would require many thousand buoys on the network. The same criticism was levelled after the September Palu tsunami which killed 2,000 people. There will be an outcry as to why an early warning system didn’t kick in. Particularly when the volcano in question, as with Anak Krakatau, is already active and displaying activity such that its eruption is not a new or a surprise event.ĭr Simon Boxall from the National Oceanography Centre and University of Southampton said: Unlike tsunamis caused by earthquakes, such volcanically induced tsunamis may not trigger warning systems that are designed to alarm after large quakes, and thus may provide little warning, unless observed directly or detected by other devices such as wave buoy warning systems. Tsunamis can be caused by volcanically induced landslides above or below water, and by volcanic eruptions themselves. Prof Dougal Jerram from the University of Oslo said: ![]() Here is some more analysis of why the tsunami came without warning. Here is today’s full report into the disaster. The Red Cross said they were preparing for the possibility of diseases breaking out in the tsunami zone.
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