Fig. 4

Summary of spatial distributions of various fault slips in the southern Ryukyu subduction zone. The red-colored squares indicate the SDR estimated in this study (Fig. 3c). The blue contours are the average slip rate in the SSE region, which were calculated from the cumulative slip from July 2010 to February 2013 (Kano et al. 2018b) with a contour interval of 40 mm/year. The orange dots represent the epicenters of LFEs (Arai et al. 2016; Nakamura 2017). Note that only the relocated LFEs in Nakamura (2017) using the S-P time delays, as well as the cross-correlation of the envelope waveforms, are plotted. The orange- and yellow-colored squares are the source models of the 1771 Yaeyama earthquake estimated by Nakamura (2009) and Imamura et al. (2001), respectively. The purple line indicates the location of the seismic survey (Arai et al. 2016)