%0 Journal Article %1 Dombard2000 %A Dombard, A. J. %A McKinnon, W. B. %D 2000 %J Geophysical Research Letters %K GALILEAN ICE; RELAXATION; RHEOLOGY SATELLITES; VISCOUS %N 22 %P 3663--3666 %T Long-term retention of impact crater topography on Ganymede %V 27 %X Previous analyses into viscous relaxation of impact craters on Ganymede have predicted short characteristic relaxation times (of the order of 100 Myr or less for larger craters), in disagreement with the apparent great ages of Ganymede's terrains. By applying improved understanding of theologic parameters and initial crater shapes to a viscoelastic model, we calculate upper limit (zero heat flow) relaxation times in excess of the age of the solar system, eliminating this discrepancy. These very long relaxation times are not due to elastic effects, but are simply due to the effective viscosity of water ice at the appropriate temperatures and stresses.

@article{Dombard2000, abstract = {Previous analyses into viscous relaxation of impact craters on Ganymede have predicted short characteristic relaxation times (of the order of 100 Myr or less for larger craters), in disagreement with the apparent great ages of Ganymede's terrains. By applying improved understanding of theologic parameters and initial crater shapes to a viscoelastic model, we calculate upper limit (zero heat flow) relaxation times in excess of the age of the solar system, eliminating this discrepancy. These very long relaxation times are not due to elastic effects, but are simply due to the effective viscosity of water ice at the appropriate temperatures and stresses.}, added-at = {2009-11-03T20:21:25.000+0100}, author = {Dombard, A. J. and McKinnon, W. B.}, biburl = {https://www.bibsonomy.org/bibtex/270282e21149f0314c722ad3173c3b7da/svance}, citedreferences = {ANDERSON JD, 1996, Nature, V384, P541 ; DOMBARD AJ, 1999, B AM ASTRON SOC, V31, P1163 ; DOMBARD AJ, 1999, LUNAR PLANET SCI, V30 ; DURHAM WB, 1997, J GEOPHYS RES-PLANET, V102, P16293 ; GAMMON PH, 1983, J PHYS CHEM-US, V87, P4025 ; GOLDSBY DL, 1997, SCRIPTA MATER, V37, P1399 ; HERRICK DL, 1990, Icarus, V85, P191 ; HILLGREN VJ, 1989, GEOPHYS RES LETT, V16, P1339 ; KIRBY SH, 1987, J PHYS-PARIS, V48, P227 ; MELOSH HJ, 1980, GEOPHYS J ROY ASTRON, V60, P333 ; MELOSH HJ, 1989, IMPACT CRATERING GEO ; PARMENTIER EM, 1981, Icarus, V47, P100 ; PASSEY QR, 1982, SATELLITES JUPITER, P379 ; PASSEY QR, 1982, THESIS CALTECH PASAD ; RANALLI G, 1995, RHEOLOGY EARTH ; SCHENK PM, 1991, J GEOPHYS RES-PLANET, V96, P15635 ; SCOTT RF, 1967, Icarus, V7, P139 ; SHOWMAN AP, 1999, Science, V286, P77 ; SOLOMON SC, 1982, J GEOPHYS RES, V87, P3975 ; SOUCHEZ RA, 1991, ICE COMPOSITION GLAC ; THOMAS PJ, 1986, J GEOPHYS RES-SOLID, V91, D453 ; THOMAS PJ, 1988, J GEOPHYS RES-SOLID, V93, P13755 ; ZAHNLE K, 1998, Icarus, V136, P202}, interhash = {ed5aa04a41e2e0f231390674647ec636}, intrahash = {70282e21149f0314c722ad3173c3b7da}, journal = {Geophysical Research Letters}, keywords = {GALILEAN ICE; RELAXATION; RHEOLOGY SATELLITES; VISCOUS}, number = 22, owner = {svance}, pages = {3663--3666}, timestamp = {2009-11-03T20:21:45.000+0100}, title = {Long-term retention of impact crater topography on Ganymede}, volume = 27, year = 2000 }