Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgre..107.5107s&link_type=abstract
Journal of Geophysical Research (Planets), Volume 107, Issue E11, pp. 17-1, CiteID 5107, DOI 10.1029/2001JE001586
Physics
11
Mineral Physics: Creep And Deformation, Physical Properties Of Rocks: Fracture And Flow, Planetology: Comets And Small Bodies: Ice, Planetology: Solar System Objects: Jovian Satellites
Scientific paper
We suggest that a crack that developed into a wedge-shaped band within the icy crust of Europa (at ~28°S, 170°W [see Schenk and McKinnon, 1989, Figure 4; Prockter et al., 1999, Figure 1]) originated under an applied compressive stress through the operation of a frictional sliding mechanism. We analyze this suggestion using a scale-independent, sliding crack model and obtain an estimate of the maximum compressive stress to initiate the crack that compares reasonably well with earlier estimates [Helfenstein and Parmentier, 1985; McEwen, 1986; Greenberg et al., 1998] of Europan crustal stresses that are based upon elastic deformation of a shell. We then show through an application of both power law dislocation creep and diffusion creep that colder, near-surface Europan ice appears to be capable of supporting the deduced stresses with little relaxation over a period from 104 to 105 years.
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