Mathematics – Logic
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..443k&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 443-445 (SEE N87-23341 16-91)
Mathematics
Logic
Geochronology, Gravitational Effects, Tectonics, Thematic Mapping, Venus Surface, Geological Faults, Planetary Evolution, Satellite Imagery, Topography
Scientific paper
Preliminary tectonic mapping of Venus from Venera 15/16 images shows unquestionable evidence of at least limited horizontal tectonism. The majority of tectonic features on Venus have no relation to topography. In fact, many axes of disruption interconnect, and cross sharp topographic boundaries at large angles, thereby discounting gravity as the driving force. Compressional zones (CZ's), unlike Extensional zones (EZ's), tend to be discontinuous, and, whereas EZ's cross tectonic and topographic boundaries at various angles, many CZ's on Venus are subparallel to these boundaries. Strike-like faulting is curiously lacking from the mapping, possible due to the steep incidence angle of the radar, which is far from optimal for detecting faults of small throw. A chronology of horizontal crustal movements, and hence the analysis of Venus' thermal development, is large dependent on understanding the crater form features. Regardless of their uncertain origin, the craters still could hold the answer to whether, and to what extent, crustal shuffling is occurring on Venus.
Kozak Richard C.
Schaber Gerald G.
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