The ice stream is the unpatterned area in the middle, flowing as indicated by arrows. The grounding line is shown dotted. Interpretation of ice stream motion along the longitudinal profile marked in Fig. 1. The dotted curve is calculated from the theory of tidal flexure, Eq. 1. The area of currently grounded ice is lightly stippled, and the marginal shear zones are more heavily stippled.
Ice flow is from top to bottom.
Richard M. Goldstein of the Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109. Hermann Engelhardt and Barclay Kamb of the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125. Richard M. Frolich of the British Antarctic Survey, Cambridge CB3 0ET, United Kingdom.