Figure 6

Schematic figure of subduction zone in the southern part of the Japan Trench. The figure is constructed based on Figures ten panel a and fifteen of Miura et al. (2003) and Figure four of Tsuru et al. (2002) by expanding the original figure landward and depthward. Microearthquakes (gray circles) in the overlying plate and a branching fault (thick red line) are shown based on Imanishi et al. (2012). Active faults and coseismic faults during the 2011 Iwaki Earthquake are shown in red (Fukushima et al.2013). The trace of the Futaba Fault is drawn using a dipping angle and depth extent as determined by a recent seismic survey by Sato et al. (2013). The depth ranges for opal to quartz and smectite to illite transitions were drawn after Kimura et al. (2012). AF denotes the aseismic front after Yoshii (1975,1979).