Recent radar observations of Venus show evidence for three types of deformational features in the linear mountain belts of Ishtar Terra: linear ridges and troughs oriented parallel to the strike of the mountains and interpreted to be anticlines and synclines; broad low arches similar to mare-ridge-type features seen on the Moon and interpreted to represent low-angle thrusting and buckling; and linear discontinuities that cut across the strike of the ridges and troughs and are interpreted to represent strike-slip movement. On the basis of the localized concentration of these features, their orientations and patterns of distribution, and their association with linear mountainous topography, we conclude that they mark the location of concentrated horizontal compressional deformation and that Akna and Freyja Montes represent erogenic belts on Venus.

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