Physics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..466g&link_type=abstract
Geophysical Research Letters, vol. 6, June 1979, p. 466-468.
Physics
3
Convective Heat Transfer, Galilean Satellites, Land Ice, Planetary Structure, Planetary Crusts, Soil Erosion, Surface Temperature, Tectonics, Temperature Effects, Thickness, Time Dependence, Viscous Flow
Scientific paper
A theoretical analysis applied to the outer Galilean satellites shows that the mean temperature within the convecting ice crust is about 180 K. The time scale of convection, thought to be a measure of a period of tectonic activity, is of the order of 5 million years and the velocities are of the order of 1-20 cm per year depending on the thickness of the convecting layers (50-1000 km). Due to low temperatures T at the surface and strong dependence of the viscosity on T, the time scale of smaller topographic features is estimated (after Johnson and McGetching, 1973) to be of the order of several hundred million years to several billion years. It is suggested that comparatively short tectonic processes, repeating every few million years, may serve as an erosion factor in shaping the form of the surfaces.
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