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

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Science  28 May 2004:
Vol. 304, Issue 5675, pp. 1295-1298
DOI: 10.1126/science.1096535

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Abstract

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.

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