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Nature 452, 539-541 (3 April 2008) | doi:10.1038/452539a; Published online 2 April 2008

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Geophysics: Humming a different tune

Toshiro Tanimoto1

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Earth breathes in and out, murmuring gently to itself as it does so. The habit has been ascribed to the tickling effects of ocean waves — but a new-found twisting oscillation might reopen the search for the source.

Over the past decade, the word 'hum' has acquired a special meaning for seismologists. No longer just what they might do under the shower, it connotes for them a fundamental resonant oscillation of the Earth.

  1. Toshiro Tanimoto is in the Department of Earth Science, University of California, Santa Barbara, California 93106, USA.
    Email: toshiro@geol.ucsb.edu

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