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Abstract The measurements by seismic sounding of the long profile of the Unteraar Glacier reported by Mercanton and Renaud are compared with theoretical calculations. By taking the valley to be a cylinder of parabolic cross-section a theoretical curve for the surface is deduced which depends on one unknown parameter only, the average shear stress on the bed. If this parameter is given the value 0.77 × 10 6 dynes/cm. 2 the theoretical curve agrees well with the measurements.
J. F. Nye (Tue,) studied this question.