We try to reveal detailed geometrical configuration and frictional state of plate boundaries. We also plan real-time observation using undersea cables. When destructive earthquakes occur under the sea, we conduct emergent seismic surveys with other universities, and try to reveal the process of earthquake occurrence. Deploying a ocean bottom seismometer. 2 Location of structural surveys during 1994-1996.
White lines indicate layer boundaries.
The crust thickness of Philippine Sea Plate changes beneath Shionomisaki Canyon. This place corresponds to one of the boundaries of earthquake blocks along Nankai Trough.