Fig. 5
From: High-resolution mini-seismic methods applied in the Mont Terri rock laboratory (Switzerland)
Principle of seismic interval-velocity measurements (IVM). b BGR 8-channel ultrasonic borehole probe (8KUBS-05). a Principle of IVM with simplified ray-paths. The simultaneous full wave recording at seven receivers (5–80 cm) allows characterisation of both the BdZ and the host rock. c Single seismic record, excitation signal (S1) and seven seismic traces with marked onsets of P- and Sv-wave phases (receivers R1–R7). d Seismic COF section for one receiver distance (R2, 20 cm) with marked P- and Sv-onsets