For the models considered, transfer functions, relating amplitudes of surface and bottom undulations, phase angles, and variation with depth of perturbational stress and velocity components, and in particular of the amplitude of internal isochronic layers, are presented. The predictions of the models presented show significant differences mutually as well as compared with those of previous theories. This opens up the possibility of using field data to check the models and possibly draw conclusions regarding flow conditions at the ice-rock interface and regarding viscosity variations with depth.
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