Abstract: The adjustment analysis of the relative gravity data of Yunnan Province was carried out to obtain the relationship between the change of the regional gravity field and the Ms6.4 earthquake in Yangbi area. The results shows: ①The gravity change of the epicenter location is weak from 2018 to 2021. The gravity changes drastically and shows four-quadrant features in the six months, one years, two years and four years; ②For the short-term and multi-year gravity changes, The high gradient zone of the gravity field is concentrated between the Yangbi-Xiaguan area, and the zero-value line alternately appears in this area before the earthquake; ③The multi-year gravity changes show that the gravity changes on the west side of the Nanjian-Weishan fault is negative, and the east side is positive; ④Analysis based on gravity anomaly indicators over one-year period shows that, the magnitude of the anomalous gravity change is 75×10-8m·s-2, and the range of the abnormal gravity change is about 130 km.

Key words: Yangbi Ms6.4 earthquake, gravity change, four-quadrant, gravity gradient zone, anomaly Index of Gravity Change

摘要： 对云南省多期相对重力数据进行平差分析，获得区域重力场变化与漾濞Ms6.4地震之间的关系。结果表明：①2018~2021年震中位置重力变化微弱，以震中为中心，附近区域在短期及一年期、两年期、四年期基本呈四象限特征并且重力变化剧烈；②震前短期及多年期的重力变化，重力场高梯度带集中在漾濞-下关区域，且零值线交替出现在该区域；③震前多年期重力变化显示，发震断裂带南涧-巍山断层西侧重力负变化、东侧重力正变化；④对临震1年期重力变化异常指标分析，重力变化异常量级为75×10-8m·s-2，重力变化异常时变距约为130km。

关键词: 漾濞Ms6.4地震, 重力变化, 四象限, 重力梯度带, 重力变化异常指标