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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

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

Fig. 1

a The seismic belt in the San-in district. Gray dots denote epicenters of intraplate earthquakes of MJ ≥ 1.0 and depths ≤ 20 km that occurred between January 2001 and December 2016. Green circles denote epicenters of large intraplate earthquakes of MJ ≥ 6.5 that occurred over the past 100 years. b Tectonic setting in and around the Japanese Islands. The rectangle outlines the area shown in a. Gray arrows indicate the plate motion of the oceanic plates relative to the continental plates

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