Sinkhole and cave ERI

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Sinkhole and Cave ERI

 ERI image of sinkhole and cave system confirmed by drilling

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Fig. 1. 260 ft long ERI profile over karst features confirmed by observation. Profile was collected with 28 electrodes spaced by 2 m and used a dipole-dipole array. Penetration is ~35 ft. Air-filled cave has high resistivity (red).  Mud-filled sink holes have low resistivity (blues). Courtesy of Schnabel Engineering.

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