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Antarctic Ice Velocity Data
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Figure 2 (Whillans and Van Der Veen, 1993). Velocity vectors superimposed on a sketch of major surface features from aerial photographs and satellite images. Some polar-grid intersections are indicated to aid correlations with the maps of Retzlaff and others (1993). The anticlines (also called warps) have been discussed by Merry and Whillans (1993). The basal(?) features are surface ridges that are less simple in form than other linear features. We speculate that they are due to ice flowing over hogbacks in the bed (ends of dipping strata that resist erosion).
Figure 3 (Whillans and Van Der Veen, 1993). Velocity vectors superimposed on elevation contours from Retzlaff and others (1993). Heavy lines mark boundaries to ice-stream flow from Merry and Whillans (1993) and Vornberger and Whillans (1990). Short lines perpendicular to contours indicate onset of ice-stream flow.
