Fig. 6From: Mathematical modelling of mantle convection at a high Rayleigh number with variable viscosity and viscous dissipationa Isothermal contour and b distribution of \(\log _{10}\eta\) for \(\mu =1.0\) at \(\Delta \eta =10^{30}\) and viscous dissipation \(D=0.3\) with \(\theta _0 = 0.1\) and \({\mathrm{Ra}} = 10^7\)Back to article page