Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992lpico.789...43h&link_type=abstract
In Lunar and Planetary Inst., Papers Presented to the International Colloquium on Venus p 43-45 (SEE N93-14288 04-91)
Physics
Magellan Project (Nasa), Structural Properties (Geology), Venus (Planet), Venus Surface, Volcanoes, Volcanology, Coronas, Deposits, Flow Distribution, Fluid Flow, General Overviews, Landforms, Lava, Novae
Scientific paper
A preliminary analysis of a global survey of Magellan data covering over 90 percent of the surface and designed to document the characteristics, location, and dimensions of all major volcanic features on Venus has revealed over 1660 landforms and deposits. These include over 550 shield fields (concentrations of small volcanos less than 20 km in diameter), 274 intermediate volcanos between 20 and 100 km diameter with a variety of morphologies, 156 large volcanos in excess of 100 km diameter, 86 calderalike structures independent of those associated with shield volcanos and typically 60-80 km in diameter, 175 coronae (annulus of concentric ridges or fractures), 259 arachnoids (inner concentric and outer radial network pattern of fractures and ridges), 50 novae (focused radial fractures forming stellate patterns), and 53 lava flood-type flow fields, and 50 sinuous lava channels (all of which are in excess of 102-103 km in length). The near-global coverage of Magellan data analyzed in this study confirms and extends the results of earlier observations that showed that volcanism is a widespread and significant process on the surface of Venus for the period of time in the presently observed record (less than about the last one billion years).
Aubele Jayne C.
Crumpler Larry S.
Head James W. III
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