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Fig. 12 | Swiss Journal of Geosciences

Fig. 12

From: High-resolution mini-seismic methods applied in the Mont Terri rock laboratory (Switzerland)

Fig. 12

Derived seismic parameters from first IVM along borehole BEZ-B3. a Apparent vp (left y-axis) and vsv (right y-axis) distribution for receivers R1, R2 and R3 (10, 20 and 30 cm) and BdZ corrected vp and vsv. b normalised P-wave amplitudes for receivers R1, R2 and R3. The derived extent of the EDZ is marked at 1.45 m. c Dynamic Poisson’s ratio (left y-axis) and dynamic Young’s modulus (right y-axis). Both are derived via BdZ-corrected velocities. d Degree of damage within the EDZ calculated as local deviation of vp from a mean reference vp. e Fracture frequency in the excavation damaged zones. Extension fractures were mapped by line-counts in newly excavated side-wall niches of the Mont Terri security gallery. Gypsum spots were observed up to 0.7 m into the tunnel wall of the security gallery, indicating an interconnected fracture network in the first 0.7 m around the security gallery

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