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Science 28 May 2004:
Vol. 304. no. 5675, pp. 1295 - 1298
DOI: 10.1126/science.1096535
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Reports

High Pore Fluid Pressure May Cause Silent Slip in the Nankai Trough

Shuichi Kodaira,1 Takashi Iidaka,2 Aitaro Kato,1 Jin-Oh Park,1 Takaya Iwasaki,2 Yoshiyuki Kaneda1

Silent-slip events have been detected at several subduction zones, but the cause of these events is unknown. Using seismic imaging, we detected a cause of the Tokai silent slip, which occurred at a presumed fault zone of a great earthquake. The seismic image that we obtained shows a zone of high pore fluid pressure in the subducted oceanic crust located down-dip of a subducted ridge. We propose that these structures effectivelyextend a region of conditionallystable slips and consequently generate the silent slip.

1 Institute for Frontier Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Showa-machi 3175-25 Kanazawa-ku, Yokohama 236-0001, Japan.
2 Earthquake Research Institute, University of Tokyo, Yayoi 1-1-1 Bunkyo-ku, Tokyo 113-0032, Japan.

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