Fig. 5

Estimated locations of passing points from the backarc intraslab earthquakes. White crosses and black contours indicate the passing points defined by the maximum brightness values, \(B\), and the 95% confidence intervals, respectively. Stars and inverted triangles denote the earthquakes and stations, respectively. Gray-shaded areas represent the high-attenuation zone in the mantle wedge. Black lines depict the structural boundaries shown in Fig. 4