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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Repeating deep tremors on the plate interface beneath Kyushu, southwest Japan

Fig. 1

Map views of Kyushu. (a) Tectonic setting of Kyushu. Triangles represent active volcanoes, and black crosses indicate the locations of Hi-net seismic stations used in this study. The thick dashed line demarcates the geographical extent of the KPR (Park et al., 2009). The thin dashed line represents the position of a cross-section presented by Hirose et al. (2008), which is shown in Fig. 5(b). The black arrow indicates the velocity and movement direction of the subducting plate. The green rectangular area represents a horizontal projection of the source fault of SSEs, as proposed by Yarai and Ozawa (2010). (b) Distribution of detected seismic events (red dots) picked up by both the duration (>30 s) and the power spectrum ratio (>10). The two red stars are the LFEs detected by JMA. The blue dots are intra-slab earthquakes located by JMA and used in this study. Distribution of seismic events picked up based solely on duration are shown as a grey dot.

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