Silent Earthquake in Japan

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Science  01 Nov 2002:
Vol. 298, Issue 5595, pp. 919e
DOI: 10.1126/science.298.5595.919e

The Tokai region of central Japan, about 200 kilometers south of Tokyo, has been accumulating strain since its last large earthquake in 1854, and there are concerns that another large-magnitude event may occur in the eastern Tokai region in the near future. Ozawa et al. (p. 1009) used global positioning system data to study ground deformation and found evidence for aseismic slip (also called a silent earthquake) as great as 2 centimeters in the western Tokai region in 2001. The aseismic slip in the western Tokai region is altering the stress state and may increase the probability of an earthquake in the eastern Tokai region.

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