Compressional features in the Tharsis Region of Mars: Orientations and Timing of Deformation

Details Compressional features in the Tharsis Region of Mars: Orientations and Timing of Deformation Compressional features in the Tharsis Region of Mars: Orientations and Timing of Deformation

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pggp.rept..304w&link_type=abstract

In NASA. Washington Rept. of Planetary Geology Program, 1983 p 304-306 (SEE N84-23431 13-91)

Other

Compression Tests, Loads (Forces), Mars (Planet), Mars Surface, Mars Volcanoes, Lithosphere, Stress Analysis, Stress Distribution, Symmetry, Tectonics, Thickness, Viscoelasticity

Scientific paper

The Tharsis ridge system appears to form a great circle around the major volcanoes. The roughly circumferential orientation of these ridges could be interpreted as the formation of a ridge system in response to a single stress field with a center near Pavonis Mons. Wise, et al. (1979) plotted the perpendiculars to strikes of ridges on the eastern flanks of Tharsis as great circles on the upper hemisphere of an equal area net. In order to further test for circular symmetry and possible other influences on ridge orientations, normals to vector means of ridge orientations were calculated using over 1850 digitized ridge segments sampled in 10 degree boxes. Orientations of individual ridge segments were weighted by their lengths, and the magnitudes of normals to vectors means were weighted by cummulative length of the ridge segments. Normals to vector means with magnitudes less than 100 km are not shown. Assuming a single fold origin for ridges, the resulting plot shows compressive stress trajectories for the ridges in the Tharsis region. The averaged compressive stress orientation around Tharsis confirm the suggestion by Wise, et al. that the ridge system is not concentric to any single point.

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