Physics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...251..180c&link_type=abstract
Science (ISSN 0036-8075), vol. 251, Jan. 11, 1991, p. 180-183. Research supported by NASA.
Physics
28
Planetary Evolution, Planetary Geology, Tectonics, Venus Surface, Radar Imagery, Satellite Imagery, Terrain Analysis, Venera Satellites
Scientific paper
Arecibo high-resolution radar images of the southern hemisphere of Venus extending to 78 deg S show that the surface of the Themis-Alpha-Lada region is characterized by linear deformation zones with volcanoes and corona-like features and by regional volcanic deposits (primarily plains, small shields, and large edifices). Large-scale areal deformation is limited to the tessera of Alpha Regio. Lada Terra, in the southern high latitudes, contains several large coronae, in contrast to Ishtar Terra in the northern high latitudes. The density of craters of possible impact origin is somewhat lower than that observed in the Venera 15 and 16 coverage; these data extend to 43 percent of the areas of the surface of Venus with ages of less than about 1 billion years.
Campbell Don B.
Fisher Paul C.
Head James W.
Hine Alice A.
Senske David A.
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