Fig. 6
From: Three-dimensional resistivity modeling of GREATEM survey data from Ontake Volcano, northwest Japan
a A staggered-grid cell V (i, j, k). Tangential electric and normal magnetic field components are sampled at the center of edges (E) and at the center of interfaces (H), and all of them are continuous. Δ i , Δ j and Δ k denote the sizes of the cells (Fomenko and Mogi 2002). b Sketch of the grid cells used for the three-dimensional (3D) EM modeling in this study. c The initial model used for the 3D EM numerical modeling computation. The model consisted of a topography layer with different block conductivities and a high-resistivity air layer (106 Ω m)