From: Guided wave observations and evidence for the low-velocity subducting crust beneath Hokkaido, northern Japan
P-wave velocity [km/s]
Density [103kg/m3]
Upper crust
6.3
2.4
Lower crust
6.7
2.8
Mantle wedge
7.8
3.2
Subducting crust
7.0
Slab mantle
8.5