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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Origin of the seismic belt in the San-in district, southwest Japan, inferred from the seismic velocity structure of the lower crust

Fig. 3

a P-wave velocity perturbations at depths of 4 and 46 km. b Results of checkerboard resolution tests at those depths. Velocity perturbations are deviations from the initial velocities at each depth. In the upper panel of a, gray triangles denote quaternary volcanoes (Geological Survey of Japan, AIST 2013), and broken lines represent boundaries of geological structures around the MTL (Kodaira et al. 2002). RY, SA, CH, and SH represent the Ryoke belt, Sanbagawa belt, Chichibu belt, and Shimanto belt, respectively. Thick lines in the lower figures represent the isodepth contours of the PHS plate (Baba et al. 2002; Hirose et al. 2008; Nakajima and Hasegawa 2007c)

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