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１９９６年２月３日，在云南省西北部的丽江县境内发生了一次Ｍｓ７０级强烈地震。此次地震前后滇西实验场重力网共进行２７期流动重力观测，其重力变化的总体特征为：１震中附近地区的丽江—剑川—洱源一带震前为下降变化，下降变化的幅值平均约３０×１０－８ｍｓ－２左右，震后重力变化继续下降；２距震中稍远一点的渡口附近地区震前为持续上升变化，累计上升变化的最大幅值达１２３×－８ｍｓ－２，震后重力变化下降，但下降变化的幅值不大，且永仁—南华一带的重力变化还在继续上升；３距震中较远的保山附近地区震前为持续上升背景上的下降变化，下降变化的最大幅值为６８×１０－８ｍｓ－２，震后还在继续下降，但昌宁—云县一带出现了局部上升变化。震前，根据前２６期资料显示的重力变化，对此次地震曾作出了一定程度的预报
On February 3, 1996, a strong Ms70 earthquake occurred in Lijiang County, northwestern Yunnan Province. Before and after the earthquake, a total of 27 hydrodynamic gravity observations were carried out in the gravity field of the experimental field in western Yunnan. The general characteristics of the gravity changes are as follows: 1) The area around Lijiang-Jianchuan- The average value of about 30 × 10-8ms-2, after the earthquake gravity changes continue to decline; 2 slightly away from the epicenter of the area near the ferry continued to rise, the cumulative increase in the maximum amplitude of 123 × -8ms- 2, after the earthquake, the change of gravity decreased, but the magnitude of the change of decline was small, and the gravity change in Yongren-Nanhua area continued to rise; 3) The area near Baoshan near the epicenter was a continuous drop in the background The maximum amplitude of change and decline was 68 × 10-8ms-2. After the earthquake, it continued to decline, but the local increase occurred in Changning-Yunxian. Before the earthquake, based on the gravity changes shown in the data of the previous 26 periods, a certain degree of forecast was made for this earthquake