Fig. 7

Signal of BdZ-corrected Vp along trace of borehole BRC-2 correlated to structural elements of Main Fault Ga08E. The trace of BRC-2 is located ca. 3.5–4.0 m behind the tunnel wall. The BdZ-corrected Vp uses different emitter-receiver spacings, which represents a larger depth of penetration (Vp on left vertical axis). Upper horizontal axis marks borehole metre of BRC-2. In the background, a common offset gather (COF) is given, showing traveltime (μs) on the right vertical axis and relative colour coded amplitudes