Meteoritics & Planetary Science 43, Nr 12, 1–crossref to last page (2008) AUTHOR’S Abstract available online at http://meteoritics.org PROOF The effect of target properties on crater morphology: Comparison of central peak craters on the Moon and Ganymede Veronica J. BRAY1, 3*, Gareth S. COLLINS1, Joanna V. MORGAN1, and Paul M. SCHENK2 1Earth Science and Engineering Department, Imperial College London, Exhibition Road, London, SW7 2BP, UK 2Lunar and Planetary Institute, 3600 Bay Area Blvd., Houston, Texas, 77058, USA 3Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona, 85721, USA *Corresponding author. E-mail:
[email protected] (Received 23 March 2008; revision accepted 01 December 2008) Abstract–We examine the morphology of central peak craters on the Moon and Ganymede in order to investigate differences in the near-surface properties of these bodies. We have extracted topographic profiles across craters on Ganymede using Galileo images, and use these data to compile scaling trends. Comparisons between lunar and Ganymede craters show that crater depth, wall slope and amount of central uplift are all affected by material properties. We observe no major differences between similar-sized craters in the dark and bright terrain of Ganymede, suggesting that dark terrain does not contain enough silicate material to significantly increase the strength of the surface ice. Below crater diameters of ∼12 km, central peak craters on Ganymede and simple craters on the Moon have similar rim heights, indicating comparable amounts of rim collapse. This suggests that the formation of central peaks at smaller crater diameters on Ganymede than the Moon is dominated by enhanced central floor uplift rather than rim collapse.