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Devastating quake redraws map
Sunday's destruction was unleashed by a 'megathrust' - a huge, sudden juddering movement beneath the ocean floor. Here, a buildup of pressure caused the Indian Ocean floor to lurch some 15 metres towards Indonesia, burrowing under its tectonic plate and triggering the ferocious swells that smashed the surrounding shores.The movement is likely to have altered the geography of neighbouring islands such as Simeulue, the Nicobar and Andaman islands, and Sumatra itself, says Bill McGuire, a geophysicist at University College London, UK. "In terms of the specific position of Sumatra on the planet, it will have moved," he says. "Things have shifted literally within minutes."
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