124 A new concept of karst development based on hydrogeology and geophysics M04, where apparent resistivities remain lower throughout the entire depth range. Below 110 meters, apparent resistivities in boreholes M20, M07, M08, and M011 drop below 100 ohm·m. Figure 5 Comparison of measured resistivities (long normal logs vs. ERT resistivity panels) with OPTV images for boreholes M04, M07, M08, and M11. For each borehole, from left to right: long normal resistivity log (Rt), ERT resistivity panel, and optical televiewer image (OPTV).
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