Non-Newtonian topographic relaxation on Europa

Details Non-Newtonian topographic relaxation on Europa Non-Newtonian topographic relaxation on Europa

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004icar..168..205n&link_type=abstract

Icarus, Volume 168, Issue 1, p. 205-208.

Mathematics

Logic

9

Ice, Rheology, Shell Thickness, Grain Size

Scientific paper

Models of topographic support on Europa by lateral shell thickness variations have previously assumed a Newtonian ice viscosity. Here I show that using a more realistic stress-dependent viscosity gives relaxation times which can be significantly different. Topography of wavelength 100 km cannot be supported by lateral shell thickness variations for ~50 Myr, unless the shell thickness is <10 km or the ice grain size >10 mm. Shorter wavelength topography would require even thinner shells, but may be supported elastically. Global-scale variations in shell thickness, however, can be supported for geological timescales if the shell thickness is O(10 km).
Present address: Department Earth and Space Sciences, UCLA, 595 Charles Young Drive E, Los Angeles, CA 90095-1567, USA.

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