Fig. 17From: Tectonic evolution of northwestern Imbrium of the Moon that lasted in the Copernican PeriodThe formation history of the mare ridges is shown. The yellow regions indicate the regions that were tectonically active after 2.1Â Ga. The reddish points indicate the tectonically active areas in the Copernican Period. Our study area is tectonically active all over the regionBack to article page