Kreslavsky and Head, 2000; Malamud and Turcotte, 2000; Garneau and Plaut, 2000). More recently, similar quantitative measures have been calculated by Rosenburg et al. (2011) for the Moon based on newly released high-resolution topographic data assembled from measurements by the Lunar Orbiter Laser Altimeter (LOLA) on board the Lunar Reconnaissance Orbiter (LRO) (Smith et al. 2010) and for Mercury from MLA/MESSENGER measurements (Zuber et al.,