Figure9-4 Seismic activity in the Kyushu region and the subducting Philippine Sea Plate (M 2 or larger, February 1996-January 1997, depths of 300 km or less).


Seismic activity that is inclining downward from the upper right (east) to the lower left (west) in the figure is along the subducting Philippine Sea Plate. From the distribution of these earthquakes, it is apparent that the Philippine Sea Plate is subducting under the Kyushu region.

[Compiled from data from Kyushu and Kagoshima Universities]