35 1. Shear velocity measurement in boreholes Figure 1.21 Hydrophone with an amplification system and 3C geophone with an anchoring system (Solgéo). Sampling Crosshole data acquisition requires small time sampling intervals. 50 μs sampling is acceptable for recording S-waves, whereas higher frequency P-waves require a faster sampling rate until 2.5 μs (Figure 1.22). a b c Figure 1.22 P recording in the same borehole with a sampling rate of (a) 2.5, (b) 32.25 and (c) 62.5 µs.
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