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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.
The Xianshuihe fault zone is located in the western part of Sichuan Province on the southeastern margin of the Qinghai-Tibet Plateau and possesses the characteristics of severe activity and high seismic frequency.According to the gravity gravity observations of the Xianshuihe fault zone in 2013-2014 and 2014-2015, In this paper, the ant colony algorithm is used to invert the activity rate of Xianshuihe fault zone before and after the Kangding earthquake. The main conclusions are as follows: (1) The Xianshuihe fault zone is dominated by left-lateral strike-slip and its slip rate is from north west to south (2) the south segment of the Xianshuihe fault zone before the Kangding earthquake was a normal fault, but the fault was inverted after the earthquake, possibly because the earthquake changed the form of fault activity in the short term; (3) the earthquake occurred After that, the slip rate of the fault zone is still large, which may indicate that the strain energy in this area is not fully released and the seismic risk still exists.