Fig. 8

Seismicity and facies boundaries in the slab crust and low S-wave velocity layer. a Across-arc vertical cross-section of intraslab earthquakes and facies boundaries in the crust of the Pacific slab under central Tohoku (modified from Kita et al.(2006)). Facies boundaries are indicated by broken black lines and a long and short dashed red line. Open circles are earthquakes. Solid and thin dashed lines are the upper plate interface and the Moho within the slab, respectively. b Across-arc vertical cross-section of S-wave velocity in central Tohoku (Tsuji et al. 2008). S-wave velocity is indicated by the color scale at the bottom. Solid line is the upper plate interface, and A denotes the upper-plane seismic belt