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In previous studies of the earth's rheology based on the times required for isostatic adjustment, the possible changes of the properties of rocks with depth have been neglected. Because recent seismological evidence points toward a crust and mantle with strongly contrasting deformational behavior, the theory of relaxation times has been formally extended to a model composed of stratified linear viscoelastic materials. Particular examples of the variation of relaxation times with wavelength for several models consisting of viscous layers, some with overlying elastic layers, are illustrated and compared with values derived from observed post-glacial uplift of Fennoscandia.
Robert K. McConnell (Fri,) studied this question.