Computer Science
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...45...87b&link_type=abstract
Icarus, vol. 45, Jan. 1981, p. 87-112.
Computer Science
32
Digital Techniques, Mars Surface, Photomapping, Spaceborne Photography, Topography, Volcanoes, Basalt, Lava, Photographic Measurement, Planetary Mapping, Stereophotography, Viking Orbiter 1, Volcanoes, Topography, Maps, Features, Olympus Mons, Elysium Mons, Albor Tholus, Uranus Tholus, Uranus Patera, Morphology, Shape, Size, Data, Techniques, Mapping, Photographs, Arisa Mons, Hadriaca Patera, Mars, Shields, Image Processing, Viking Orbiters, Comparisons
Scientific paper
Results are presented of the topographic mapping of six large central volcanoes on Mars. Stereo images of the volcanoes Olympus Mons, Elysium Mons, Albor Tholus, Ceraunius Tholus, Uranius Tholus and Uranius Patera were acquired by Viking Orbiter 1, and pairs of images were compiled into topographic maps through the use of digital image measurement techniques. Olympus Mons is found to have the general form of a terrestrial basaltic shield constructed almost entirely from lava flows, however with an altitude of 20-23 km and flank slopes averaging about 4 deg; a high nominal density indicates that anomalously dense lithosphere underlies the shield. Uranius Patera is observed to be a similar feature of present relief about 2 km, with its lower flanks buried by later lava flood deposits. Elysium Mons has about 13 km of local relief with average slopes of 4.4 deg, although its upper flank slopes are significantly steeper than those of Olympus Mons, suggesting a shield volcano modified by a terminal phase of mixed volcanic activity. Albor Tholus is found to be a partially buried 3-km shield-like construct, while Ceranius and Uranius Tholus are steeper cone-like features with reliefs of about 6 and 2 km, respectively, which may be lava shield constructs modified by a terminal stage of explosive activity.
Blasius Karl R.
Cutts James A. J.
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