N-12 AVO AND ELASTIC IMPEDANCE S. MALLICK Summary: Traditional AVO analysis involves computation of the AVO intercept and gradient from a linear fit of P-wave reflection amplitude to the sine square of the angle-of-incidence. This linear fit is based on the approximate P-wave reflection coefficient formulation in intercept-gradient form given by Bortfeld (1961) and Shuey (1985) among others. Under the assumption of a background P-S velocity ratio of two the AVO intercept and gradient values can also be combined to obtain additional AVO attributes such as pseudo S-wave data and Poisson’s ratio contrast. AVO intercept and pseudo S-wave data are


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