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Nature 440, 430-431 (23 March 2006) | doi:10.1038/440430a; Published online 22 March 2006

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Earthquakes: A movement in four parts?

Joanne Bourgeois1

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From time to time, over millennia, northwestern North America has experienced huge earthquakes. These events may be preceded by tell-tale subsidence, but the evidence is devilishly difficult to decipher.

Over the past year, two groups of micropalaeontologists1, 2 have presented evidence that coastal land subsides not only during a great earthquake but also in the decade or so before such events. Their study areas are the Alaska and Cascadia subduction zones in northwestern North America.

  1. Joanne Bourgeois is in the Department of Earth and Space Sciences, University of Washington, Seattle, Washington 98195-1310, USA.
    Email: jbourgeo@u.washington.edu

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