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通过对跨祁连山-海原断裂带的民乐、华藏寺和沙沟河等3个剖面2005～2009年GPS、水准及重力观测资料的分析,得到各观测量在每个时间段的变化特征,对剖面所跨主要断裂的活动特征有所了解。发现跨不同剖面的昌马-俄博断裂、毛毛山断裂、庄浪河断裂和海原断裂附近点位的位移和重力变化都较大,表明这些断层活动性较强;通过分析各剖面垂直位移与重力变化的关系,可知重力变化主要由于物质的迁移引起。GPS资料分析表明,2006～2007年水平运动基本沿断层走向,而2007～2008年水平位移偏离断层走向,以东向位移增大为主;通过进一步对剖面周围的中国地壳运动网络连续观测站坐标时间序列的去线性分析,得知2007～2008年的观测结果与汶川地震的影响有关。用2008～2009年的重力变化同重力布格异常背景相比,可知民乐剖面附近处于调整恢复阶段,而华藏寺和沙沟河剖面附近的异常仍没有完全解除。
Through the analysis of the GPS, level and gravity observation data of the three sections of Minle, Huazang Temple and Shagou River which cross the Qilian-Haiyuan fault zone from 2005 to 2009, the change characteristics of each observation period in each time period are obtained. The characteristics of the activities across the major faults are well understood. It is found that the displacements and gravitational changes of Changma-Bu’erbo fault, Maochaoshan fault, Zhuanglanghe fault and Haiyuan fault across different sections are larger, indicating that these faults are more active. By analyzing the vertical displacements of each section and The relationship between gravity changes shows that gravity changes are mainly caused by material migration. GPS data analysis shows that the horizontal movement from 2006 to 2007 basically follows the strike of the fault and the horizontal displacement deviates from the strike of the fault from 2007 to 2008 with the increase of eastward displacement. By further analyzing the coordinate of the continuous observation station of crustal movement network around the section Time series of linear analysis, that the 2007-2008 observations and the Wenchuan earthquake impact. Compared with the gravitational Bouguer Abnormity Background from the gravity change in 2008 ~ 2009, we can see that the vicinity of Minle profile is in the adjustment and recovery stage, while the anomalies near Huazangsi and Shagouhe profiles have not been completely eliminated.