Support of long-wavelength loads on Venus and implications for internal structure

Details Support of long-wavelength loads on Venus and implications for internal structure Support of long-wavelength loads on Venus and implications for internal structure

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91..403b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Jan. 10, 1986, p. 403-419.

Physics

63

Lithosphere, Planetary Structure, Topography, Venus Surface, Planetary Geology, Planetary Mantles, Shell Theory, Stress Distribution, Tectonics, Venus, Wavelengths, Interior, Structure, Calculations, Distribution, Stress, Surface, Lithosphere, Models, Density, Anomalies, Depth, Crust, Mantle, Boundaries, Parameters, Thickness, Topography, Age, Gravity Properties, Comparisons, Tectonics, Highlands, Isostacy, Ishtar Terra, Aphrodite Terra, Atla Regio, Beta Regio, Eisila Regio, Thetis Regio, Tethus Regio, Ovda

Scientific paper

The development of a thin-shell formulation to compute stress in a planetary lithosphere is discussed. The formulation uses spherical harmonic representations of the gravity field and topography as boundary conditions to produce lateral density anomalies at two depths. The stress fields for displacement, crustal thickness anomaly, and mantle density anomaly, which are required for the boundary conditions, are calculated. The computed stresses are compared to the tectonic features of Venus. The data reveal that the highland areas are formed in a state of isostasy or uplift and are supported by dynamic processes in the mantle. Lithospheric models predict low-density mantle beneath Alta, Beta, Eisila, Thetis, and Thetus Regiones, and thick crust accompanied by higher-density mantle under Ishtar Terra and Ovda Regio.

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