Kodaira Shuichi, Iidaka Takashi, Kato Aitaro, Park Jin-Oh, Iwasaki Takaya, Kaneda Yoshiyuki
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.
Science. 2004 May 28;304(5675):1295-8. doi: 10.1126/science.1096535.
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 effectively extend a region of conditionally stable slips and consequently generate the silent slip.
在多个俯冲带均检测到了无声滑动事件，但这些事件的成因尚不清楚。通过地震成像，我们发现了东海无声滑动的一个成因，该事件发生在一次大地震的假定断层带上。我们获得的地震图像显示，在俯冲海岭下倾方向的俯冲洋壳中存在一个高孔隙流体压力带。我们认为，这些构造有效地扩展了条件稳定滑动区域，从而产生了无声滑动。
