Compressional wave anisotropy caused by a single fracture and three parallel fractures was measured using an acoustic imaging system. The measured compressional wave transmission coefficients are compared with theoretically predicted transmission coefficients from the displacement discontinuity theory. Deviations from the displacement discontinuity theory occur at glancing angles of incidence to the fracture. The anisotropy in the transmission coefficient is observed to be frequency dependent and results in an apparent frequency-dependent stiffness.

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