Figure 6

Pressure (a) and temperature (b) models for the Tohoku-oki megathrust. The green line represents the lithostatic pressure σ_V, and the light blue line shows the hydrostatic pressure gradient. The pore pressure ratio λ is indicated by dotted lines. The thick blue line represents the pore pressure model. P_p at the depth z = 21.5 to 45 km is given by P_p = σ_V((1 - β)λ_c + β) and β = (z - z_up)/(z_down-z_up), where λ_c = 0.53, z_down = 45 km, and z_up = 21.5 km.