Page last updated at 08:47 GMT, Friday, 29 May 2009 09:47 UK

Getting to the bottom of earthquakes

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A pioneering project off the coast of Japan aims to go further into an earthquake zone than ever before. BBC environment correspondent Richard Black, the first journalist to visit the research ship Chikyu, reports on the drilling for rock cores from the quake-generating Nankai Trough to explore what causes tremors.

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