Fig. 13

Intraplate earthquakes in the incoming oceanic crust off Kii Peninsula based on Tsuji et al. (2009). Yellow solid line represents NT501H. The focal mechanisms of mainshocks and aftershocks of the 2004 off the Kii Peninsula earthquake by Ito et al. (2005) are shown on the bathymetry map. The epicenters of the aftershocks determined from a dense array of ocean-bottom seismometers (Sakai et al. 2005) and the epicenters of micro-earthquakes during the inter-seismic period (Obana et al. 2005) are mapped with red circles and red crosses, respectively. The active seismicity can be seen on the extremely high-attenuation zone (eHAZ). The orange rectangle shows the previous 3D seismic survey area. The red-shaded area within the orange rectangle and red solid lines are 3D interpreted area and 2D interpreted seismic lines by Tsuji et al. (2009), respectively