Western Aphrodite Terra, Venus, is characterized by a series of parallel linear structural discontinuities 2000-4000 km in length and 100-200 km wide, which strike at high angles to the general topographic trend of the highlands. The detailed characteristics of these features are similar to terrestrial oceanic fracture zones and strike-slip fault zones. Either interpretation implies the presence of large-scale horizontal tectonic movement on Venus. ¿American Geophysical Union 1987