Fig. 5


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Passive acoustic logging processed by interferometry. a: interference noise section. The section is normalized and displayed with a color scale ranging from 0 (blue) to 1 (red). Arrows indicate the presence of acoustic waves. b: from top to bottom: zoom of the cross-correlation noise section in 0–0.5 ms time interval, picked times DTmax of the maximum of the cross-correlation noise section, flattening of the cross-correlation noise section with DTmax.

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