Gravity on the Move

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Science  15 Oct 2004:
Vol. 306, Issue 5695, pp. 369
DOI: 10.1126/science.306.5695.369f

Earthquakes displace material, which changes the distribution of mass within Earth and hence the local acceleration of gravity at the surface. Such changes are tiny, however. Imanishi et al. (p. 476) measured a 1-microGalileo change in acceleration caused by the 25 September 2003 Tokachi-oki earthquake, which had a moment magnitude of 8, with a suite of three superconducting gravimeters on Japan. Thus, gravimetry is precise enough to be useful for modeling and interpreting earthquake dynamics.

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