23 1. Shear velocity measurement in boreholes Figure 1.5 Illustration of the difference between actual path and straight rays in a classic downhole analysis (left). On the right, a ray model after joint inversion (Fugro for EDF) of a crosshole and 2 downholes with different offsets, illustrating that refracted waves are more present when the source offset is increased. Figure 1.6 Illustration of a tube wave in a water-filled borehole.
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