P192 A NEW APPROXIMATION OF THE REFLECTION AND TRANSMISSION COEFFICIENTS BETWEEN TWO VISCO-ELASTIC ISOTROPIC MEDIA ALEXEY STOVAS and BJØRN URSIN NTNU Dept. of Petroleum Engineering and Applied Geophysics 7491 Trondheim Norway 1 INTRODUCTION We consider the plane-wave reflection and transmission (R/T) coefficients between two isotropic viscoelastic media where the medium parameters are complex function of frequency (Ben-Menahem and Singh 1981). Continuity of stress and displacement velocity gives the exact equations for the R/T coefficients (Aki and Richards 1980). By normalizing the R/T coefficients with respect to vertical energy-flux and using the formulation in Ursin and Stovas (2000) the equations for


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