Fig. 5
From: Along-trench structural variation and seismic coupling in the northern Japan subduction zone
Schematic cross-sections of the northern Japan subduction zone, comparing the weakly coupled segment B with strongly coupled segments A and C. Segment B has the following features, which contrast with those of segments A and C: (i) a well-developed horst and graben structure on the outer slope and beneath the inner slope; (ii) a thin layer with low P-wave velocity along the plate interface in the crust-crust contact zone; (iii) a shallow forearc Moho; and (iv) probably low seismic velocities within the forearc mantle wedge.