Fluid Source for Seismic Slip

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Science  28 May 2004:
Vol. 304, Issue 5675, pp. 1207
DOI: 10.1126/science.304.5675.1207f

The subduction of Philipine Sea plate beneath the Eurasian plate has created the Nankai Trough off the coast of Japan and also yielded several great earthquakes. The northernmost segment of the Nankai trough has not had an earthquake, but instead the two plates creep past one another in seismically-silent slip events. Kodaira et al. (p. 1295) have determined that the region is creeping because of a zone of high pore fluid pressure is trapped on the downgoing side of a subducted ridge.

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