Figure F39. Summary of logs recorded by the "sonic combo" tool string in Hole U1354C. Sonic waveform (WF) amplitude is shown as an indicator of data quality. High waveform coherence, shown in red in the two velocity tracks, is a measure of the reliability of the slowness/time coherence algorithm used to derive compressional (VP) and shear (VS) velocities from the monopole and lower dipole sonic waveforms, respectively.
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