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Nature 454, 833-835 (14 August 2008) | doi:10.1038/454833a; Published online 13 August 2008

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Earth Science: Solid evidence in the inner core

Kenneth C. Creager1

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The indications are that a solid ball of iron lies at Earth's centre. But only the identification of an elusive seismic signature can confirm the long-standing assumption that it is indeed solid.

It is widely accepted that Earth's inner core is solid. Seismologists have long been trying to find direct evidence of this assertion — which could come in the form of the identification of a particular kind of seismic wave, called a shear wave, travelling through the inner core.

  1. Kenneth C. Creager is in the Department of Earth and Space Sciences, University of Washington, Seattle, Washington 98195-1310, USA.
    Email: kcc@ess.washington.edu

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