Final P and S wave velocities and Vp/Vs ratio. (a) Final P wave velocity model. Surface geological information is also presented at the top of the figure. Although plutonic rocks of the Kofu granitic complex (KGC) are present at the surface in the southern part of the profile, no lateral velocity increase exists for the upper 4 km of crust. Black arrows highlight a reflector at 4-km depth, which is interpreted to be the top of the high-velocity body of the KGC (see also ‘Discussion’ and Figure 8). Red lines denote crustal reflectors. Grey color means no ray coverage. (b) Final S wave velocity model. (c) Vp/Vs ratio calculated from (a) and (b).