【摘要】 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。更多还原

【Abstract】 By analyzing GPS,level and gravity observation data of Minle,Huazangsi and Shagouhe profiles across the Qilian-Haiyuan fault during 2005～2009,the changes of these data and activity characteristics of the main faults in different times have obtained.Changma-Er’bo,Maomaoshan,Zhuanglanghe,and Haiyuan faults are active in recent years.The research of the relationship between the vertical displacement and mobile gravity data proves that the gravity changes are mainly due to the migration of the material.GPS data analysis shows that the direction of the horizontal movement velocity was almost along the fault strike in 2006～2007,while in 2007～2008 the horizontal velocity deviated from the fault direction with the increased east horizontal movement velocity.The linear suppression analysis of the N and E coordinate values of the continuous observation stations of the Crustal Movement Observation Network of China around three profiles shows that the Wenchuan earthquake event has an effect on the observation results in 2007～2008.Compared the gravitational changes in 2008～2009 with the Bouguer gravity anomaly shows Minle profile is in adjustment phase,while the pressure is still not completely relaxed in Huazangsi and Shagouhe profiles.更多还原