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Nature 436, 637-638 (4 August 2005) | doi:10.1038/436637a; Published online 3 August 2005

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Earth science:  Trouble under Tonga?

George Helffrich1

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Earthquakes occur in cool, foundering tectonic plates deep within the Earth. But seismic data from the southwestern Pacific indicate that the minerals that make up the plates at depth don't behave as if they are cool.

Is there something wrong with our understanding of basic seismological features of Earth's mantle, the seismic discontinuities at depths of 410 km and 660 km? A report by Rigobert Tibi and Douglas A.

  1. George Helffrich is in the Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK.
    Email: george@gly.bris.ac.uk

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