Elastic wave propagation along a set of parallel fractures

Details Elastic wave propagation along a set of parallel fractures Elastic wave propagation along a set of parallel fractures

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29p..31n&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 16, pp. 31-1, CiteID 1784, DOI 10.1029/2002GL014925

Physics

1

Physical Properties Of Rocks: Acoustic Properties, Seismology: Body Wave Propagation, Seismology: Theory And Modeling

Scientific paper

Previous studies on elastic wave propagation in fractured media have demonstrated that a single planar fracture supports fracture interface waves and that two plane parallel fractures support fracture channel waves. Here, the results are presented for plane wave propagation through an infinite number of plane parallel fractures with equal fracture spacing and fracture stiffnesses. Analysis of the dispersion equations for this fractured system demonstrates that these waves exhibit symmetric and antisymmetric particle motions, degenerate to classical Rayleigh-Lamb plate waves when the fractures are completely open, and possess dispersive velocities that are functions of both the fracture stiffness and spacing. Time-frequency analysis performed on a series of laboratory ultrasonic transmission measurements on a fractured rock analog shows good agreement with the theoretical predictions.

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