Fig.12
From: Velocity structure in the crust beneath the Kyushu area
(a) Vertical cross-sections of velocity perturbations for V p (top), velocity perturbations for V s (middle) and V p / V s (bottom) across the BSG. (b) Vertical cross-sections of velocity perturbations for the RRT results. The velocity perturbation is calculated with respect to the average of the estimated velocity values at each depth. Masking obscures areas of low reliability (see Fig. 6 and the text for details). Red triangles mark the Kujyu volcanoes and circles indicate the epicenters of the relocated events. Earthquake hypocenters (circles) within 15 km of each cross-section are plotted. Diamonds of each panel correspond to positions shown in the insert map.