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中文摘要：
鲜水河断裂带处于青藏高原东南缘的四川西部,具备活动剧烈、地震频率高的特性.根据鲜水河断裂带2013-2014年和2014-2015年的流动重力观测资料,基于经典位错理论,本文采用蚁群算法反演了康定地震前后鲜水河断裂带的活动速率,得到的主要结论有：（1）鲜水河断裂带主要以左旋走滑为主,滑动速率由北西段到南东段逐渐减小;（2）康定地震前鲜水河断裂带南东段为正断层,但震后表现为逆断层,原因可能是该地震改变了短期内断层活动形式;（3）地震发生后,该断裂带的滑动速率依然很大,可能表明该地区应变能没有得到全部释放,地震危险性依然存在.
英文摘要：
Xianshuihe fault belt is located at the southeast side of Qinghai-Tibet Plateau in western Sichuan and features violent activities and highly-frequent earthquakes. According to the mobile gravity surveys on Xianshuihe fault belt from 2013 to 2014 and from2014 to 2015 and based on the classic dislocation theory,this thesis applies ant colony algorithm,derives reversely the active rate of Xianshuihe fault belt before and after Kangding earthquake and makes major conclusions as follows： firstly, the activity of Xianshuihe fault belt happens mainly in the form of sinistral slip and the slip rate drops off gradually from the northwest section to the southeast section; secondly, before Kangding earthquake, the southeast section of Xianshuihe fault belt is of normal fault,however after Kangding earthquake,it changes to reverse fault. It is likely that it is the earthquake that has helped to change the form of fault activity in a short time; thirdly,after the earthquake,the slip rate of the fault belt is still quite high which might be an indication that the strain energy of this region hasn’t been released fully and this region is still in danger of earthquakes.
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