The perturbation to the momental figure of Ganymede by the impact basin Gilgamesh as modelled, and it was found that the formation of the basin could have significantly reoriented the satellite. Global trends of groove orientation suggest that groove sets formed in reactivated zones of weakness, which were created by tidal despinning and furrow formation. The paleopole on which despinning occurred was shifted about 15¿ after emplacement of most grooved terrain. The youngest grooves have orientations consistent with those expected for fractures caused by the reorientation. |