Fig. 1
From: Depth variation of seismic moment and recurrence interval in Japan
Spatial distribution of the 49 seismically dense spheres (SDS). The background color is the surface elevation (km) from the Etopo digital elevation model (Smith and Sandwell 1997). The black and violet lines indicate the iso-depth (km) contours of the upper surface of the subducted Pacific (PAC) and Philippine Sea (PHS) plates (Nakajima and Hasegawa 2007). The overlapping colored circles marked by numbers 1 to 49 are the seismically dense spheres targeted in this study