Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7625b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 10, 1988, p. 7625-7633.
Physics
79
Callisto, Europa, Ganymede, Glaciology, Ice, Satellite Surfaces, Sliding Friction, Jackets, Stress Analysis, Tectonics, Temperature Distribution, Voyager Project
Scientific paper
Frictional sliding experiments were performed on saw-cut samples of laboratory-made polycrystalline water ice, prepared in the same way as the material used by Kirby et al. (1987) in ice deformation experiments. The data show that the maximum frictional stress is a function of the normal stress but is not measurably dependent on temperature or sliding rate over the ranges covered in these experiments (77-115 K and 0.0003-0.03 mm/s, respectively). The sliding behavior was invariably stick slip, with the sliding surfaces exhibiting only minor gouge development. In samples with anomalously low strength, a curious arrangement of densely packed short vertical fractures was observed. The results of these experiments were applied to a model of near-surface tectonic activity on Ganymede, one of Jupiter's icy moons. The results indicate that a global expansion on Ganymede of 3 linear percent will cause extensional movement on preexisting faults at depths to 7 + or - 3 km.
Beeman M.
Durham William B.
Kirby Stephen H.
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