Tectonics of the Valhalla structure on Callisto

Details Tectonics of the Valhalla structure on Callisto Tectonics of the Valhalla structure on Callisto

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept..535t&link_type=abstract

In NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984 p 535-539 (SEE N85-23474 13-91)

Physics

Callisto, Planetary Geology, Satellite Surfaces, Structural Properties (Geology), Tectonics, Azimuth, Distribution (Property), Escarpments, Geomorphology, Lithosphere, Planetary Mapping

Scientific paper

The surficial morphology of Callisto is dominated by large concentric patterns of ridges, scarps, and furrows. The largest one, Valhalla, shows a smooth central area 350 km in radius, surrounded by concentric sinuous ridges which extend as far as 600km from the center. Beyond the ridged area, scarps and furrows are observed as far as 2000 km. The global azimuthal distribution of the scarps and furrows of the outer ring (beyond 700 km from the center) was analyzed. It is proposed that the local geometry and the global distribution of scarps and furrows around Valhalla are the results of the reactivation of an old pattern by the Valhalla event. The coincidence of these local directions of a preexisting pattern (NW-SE and NE-SW) with the directions of the grids observed on most bodies observed so far in the solar system would indicate that this local pattern is a part of a global calistean grid.

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