MOESM1 of Hydrothermal system of the active crater of Aso volcano (Japan) inferred from a three-dimensional resistivity structure model

Additional file 1: Fig. S1. Plot of data misfit versus model roughness. Various models calculated with several values of hyper-parameters (α2 and β2) are shown. This plot was used to determine α2 under the L-curve criterion. Fig. S2. Comparisons of the observed data with the results of the final 3-D model. Comparisons of the apparent resistivity and the phase of the (a) Zxx component, (b) Zxy component, (c) Zyx component, (d) Zyy component, and (e) tipper component. Red dots with error bars indicate observed data, and green lines indicate model results. Fig. S3. Histograms of (a) sensitivity density and (b) sensitivity. Histograms for meshes within the core region and within the whole calculation domain are shown by red and green bars, respectively. The core region was defined as a cubic region ranging from −1000 to 1000 m in the N–S and E–W directions, and from − 2000 to 0 m in the vertical direction, which covers most of the AMT survey area. The vertical dashed line in each histogram indicates the lower limit of the relatively sensitive mesh (10−6.4 for sensitivity density and 100.5 for sensitivity), which was determined so as to contain most of the mesh of the core region