Fig. 9
From: Velocity structure in the crust beneath the Kyushu area
Vertical cross-sections of (a) velocity perturbations for V p , (b) velocity perturbations for V s , and (c) V p / V s in the direction of PHS plate subduction. The Y-position of each section is noted in the lower left corner of each P -wave panel and shown in the insert map. The velocity perturbations are calculated with respect to the average of the estimated velocity values at each depth and masking obscures areas of low reliability (see Fig. 6 and the text for details). Earthquake hypocenters (circles) within 15 km of each cross-section are plotted. The red triangle and gray rectangle above each panel mark the position of active volcanoes and the Kyushu Mountains, respectively. A (white dot) and B (gray dot) show the regions with low velocity and low V p / V s and with low velocity and high V p / V s , respectively.