Elastic Thickness and Heat Flux Estimates on Ganymede

Details Elastic Thickness and Heat Flux Estimates on Ganymede Elastic Thickness and Heat Flux Estimates on Ganymede

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p12b0503n&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P12B-0503

Physics

5418 Heat Flow, 5475 Tectonics (8149), 6218 Jovian Satellites, 8010 Fractures And Faults

Scientific paper

We identify sites of apparent flexural uplift at rift zone boundaries on Ganymede using Galileo stereo-derived topography. The estimated effective elastic thickness Te is 0.2-0.6 km for a nominal Young's modulus of 1 GPa. Using a viscoelastic model of the ice crust we find that the ratio of Te to conductive lid thickness is <=0.5. The inferred local heat flux during deformation is less than 480~mW m-2 , and probably close to 60 mW m-2. This latter value is an order of magnitude greater than the present-day radiogenic heat flux. The stresses required to cause fault motion are around 1 MPa. Both the high heat flux and the high stresses are consistent with estimates of these quantities during an episode of transient tidal heating in Ganymede's past.

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