74 years ago today, on December 21, 1951 (November 23, 1951 in the lunar calendar), a magnitude 6.3 earthquake occurred in Jianchuan, Yunnan. On December 21, 1951, a magnitude 6.3 earthquake occurred in Jianchuan, Yunnan. At the time of the earthquake, the water waves in Jianhu Lake reached four or five feet high, surged up to one kilometer on the lake shore, and washed away lake villages and fields such as Liuying. It is currently the largest earthquake lake roar.