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Title:: Analysis of Deformation Features in Shanxi Area Based on Gravity and GPS Measuerements

作者:: 王同庆¹; 王树发¹; 杨博¹; 李真²; 陈兆辉¹; 张品¹; 1.中国地震局第一监测中心,天津 300180; 2.中国地震局地球物理勘探中心,河南郑州 450002

Author(s):: WANG Tongqing¹; WANG Shufa¹; YANG Bo¹; LI Zhen¹; CHEN Zhaohui¹; ZHANG Pin¹; 1.First Crust Monitoring and Application Center,CEA,Tianjin 300180,China2.Geophysical Exploration Center,CEA,Zhengzhou 450002,Henan,China

Keywords:: gravity field; horizontal total-gradient; strain field; deformation features; Shanxi area

摘要:: 利用山西地区多年来积累的流动重力和区域GPS资料,从段、线、面对山西地区(34°～41°N,110°～115°E)2009—2015年重力场动态变化特征进行精细处理和详细分析,同时将水平总梯度分析方法用于重力场动态变化的异常提取中,最后对比相同时间尺度的重力场和应力应变场获得近年来山西地区地壳形变精细变化特征。结果表明:重力水平总梯度具有比重力异常更高的灵敏度,两者的动态变化特征都显示出,在山西北部恒山断裂、六棱山断裂和口泉断裂附近的阳原—大同一带、南部中条山断裂的临汾—夏县一带和中东部太行山山前断裂的邯郸—安阳附近都存在着较为显著的异常变化; 通过对比分析认为相同时间尺度的重力场和应变场有较好的对应关系,联合分析重力和应变场有助于对地壳形变和深部物质变化产生的孕震机理获得更深刻的认识。

Abstract:: We use campaign gravity and regional GPS data accumulated over the years to process and analyze 2009-2015 dynamic variation of gravity field of Shanxi rift zone and its adjacent areas based on the segment,line,face.Then we apply horizontal total gradient method to extract anomaly information from the dynamic variation of gravity field.Finally,we compare the gravity field and strain field in recent years on the same time scale to obtain the precise variation of crustal deformation in Shanxi area.The results show that:(1)Horizontal total-gradient gravity field has higher sensitivity than gravity anomaly.Both of their dynamic variations show more significant changes in the area of Yangquan-Datong near Hengshan fault,Liulengshan fault and Kouquan fault in northern Shanxi,the area of Linfen-Xiaxian near the Zhontiaoshan fault in southern Shanxi,and the area of Handan-Anyang near the Taihang mountain Shanqian faults in mid-eastern Shanxi;(2)The same time-scale gravity and strain field corresponded well from the comparative analysis.Joint analysis of gravity and strain field can help us to study the crustal deformation and seismogenic mechanisms generated by the changes of deep physical properties.