Fig. 7
From: Magnetotelluric transect of Unzen graben, Japan: conductors associated with normal faults
Sensitivity tests of two different anomalies: C1 and R1. The final model RMS is 1.60. a Altering the C1 anomaly using 100 Ωm blocks over 2.1 km × 2.4 km × 4.7 km area (in N–S, E–W, and vertical directions) increasing RMS to be 3.20. b Altering the R1 anomaly using 10 Ωm blocks over approximately 2.2 km × 2.4 km × 4.5 km area (in N–S, E–W, and vertical directions) causing RMS to be 1.70. The upper panels show the corresponding sounding curves after sensitivity tests. In each sounding curve, the upper and lower sub-panels correspond to the apparent resistivity and phase, respectively. The symbols indicate observed data for each component. The green lines represent calculated data from the altered models. The bottom panels show the N–S profile after the blocks were modified