Four profiles offshore northeastern Taiwan showing the V_P (left panels) and V_P/V_S structures (middle panels), the relocated seismicity and the focal mechanisms (right-hand panels). Locations of the profiles are indicated in Fig. 4. Dashed lines in the middle panels represent estimated upper surface position of the subducting slab. Focal mechanisms in right-hand panels are rotated for cross-section views. Red dots represent P axes of earthquakes, and blue dots represent T axes.