Along this trench the Philippine Sea plate is subducting under the Ryukyu island arc, as evidenced by the seismic reflection surveys, earthquake source locating results, and fault plane solutions of earthquakes.

• 海底地震反射探测和地震震源定位表明 ；菲律宾海板块沿海沟向琉球岛弧下俯冲 ；俯冲角度与深度沿海沟走向变化 .