![]() ![]() The success of EEI depends on finding an optimum value for the angle χ. The extended elastic impedance (EEI) method uses a rotation angle χ to map A and B into a new reflectivity corresponding to a particular elastic parameter. The most common of these extracted reflectivities are the intercept and gradient, usually labeled A and B, respectively. Linearized approximations to the P-wave reflectivity as a function of the incidence angle (called amplitude variation with offset) involve the extraction of band-limited reflectivity terms that are a function of changes in the elastic constants of the earth across each lithologic interface.
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