Fig. 2

Apparent resistivity map for comparison of observed data (obs) with calculated response (clc) from the resistivity structure (Fig. 4). Apparent resistivity was calculated from the rotationally invariant ssq impedances in Eq. (1) (Rung-Arunwan et al. 2016). The white line represents the rim of Aso caldera. Observational data with errors of >0.3 in log₁₀Ωm are not shown. The notations are the same as in Fig. 1