The depth-migrated 250 MHz radar images illuminate fractures, karst voids, and the far wall of the pillar up to approximately 25 m depth into the rock, with a spatial resolution of <0.5 m. Large pillar wall topography was included in the steep-dip Kirchhoff migration algorithm because standard elevation corrections are inaccurate. Strong radar reflections in the field data correlate with fractures and a cave exposed on the pillar walls. The objective was to test the ability of radar to image fractures and karst voids and to characterize their geometry, aperture, and fluid content, with the goal of mitigating mining hazards. Two- and three-dimensional rock-penetrating-radar data were acquired on the wall of a pillar in an underground limestone mine.
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