Figure 2

Synthetic data used in the inversion test. (a) Synthetic distributions of porosity ϕ and aspect ratio α, which are to be estimated. They were generated by 50×50 random walks; the variances were set to $({\sigma }_{\varphi }^2,{\sigma }_{\alpha }^2)=(0.004^2,0.015^2)$. (b) Observational data of V _P and V _S . They were obtained using Equation 1 with Gaussian noise; the variances were set to $({\sigma }_{\mathrm{P}}^2,{\sigma }_{\mathrm{S}}^2)=(0.1^2,0.05^2)$.