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Fig. 4 | Earth, Planets and Space

Fig. 4

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

Fig. 4

a P-wave velocity perturbations at depths of 11 and 25 km. b Results of checkerboard resolution tests at those depths. c Vertical cross-sections along lines A–C drawn in the bottom right map. Velocity perturbations are deviations from the initial velocities at each depth. In a and c, gray dots denote earthquakes of MJ ≥ 1.0 and depths ≤ 20 km that occurred between January 2001 and December 2016. White circles denote large intraplate earthquakes of MJ ≥ 6.5 that occurred over the past 100 years

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