103 5. Geophysical methods 5.4 Vertical seismic profiles versus full waveform acoustic logging VSP acquisition was also done using a hydrophone as a borehole sensor and a lightweight dropper as a source. The depth sampling interval is 2.5 m. Figure 13 shows the VSPs recorded in boreholes C1 and M20. The VSPs were highly corrupted by Stoneley waves. The conversion of down-going P-waves (blue arrow in VSP (a) (b) Figure 13 Comparison between VSP and acoustic data at boreholes C1 (a) and M20 (b).
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