Abstract
Impacts on the early Moon are expected to have been extremely asymmetrical between the leading and trailing hemispheres because of its large orbital velocity. Morota et al. [2004] have suggested a model that the early Moon had gradually rotated toward the east as a consequence of the redistribution of crustal materials due to the heavy asymmetrical bombardment. In this study, we estimate the asymmetry in crustal thickness generated by the heavy asymmetrical bombardment during the formation of the impact basins. The calculated difference in the crustal thickness is consistent with that computed from the lunar gravity anomaly.
