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Figure 6

Figure 6. Travel time measurements through a test sample before (bottom four traces) and after (top four traces) cracking the sample to create a propagation medium of quasi-aligned fractures. Confining pressure was varied as labeled between measurements. A principal finding is that P and S1 react weakly to the presence of fractures (panels a and b), but S2 reacts strongly (panel c). Modified from Xu and King (1989).