摘要
基于中国地壳运动观测网络1999～2007年的GPS复测资料,建立起整体无净旋转基准,分析了山西地堑系内部地壳运动的细节特征,并利用图形单元法分析了其应变场的分布特征,深入剖析了地壳变形的动力学机制,得出山西地堑系现今构造应变场以NW-SE向拉张应变为主,与区域现代震源机制解及长期构造变形背景相一致;临汾、大同盆地是地堑内剪切应变高值区,现今地壳活动强烈。解释了地堑系内形变异常区的成因,由此揭示出连接临汾与太原盆地的构造隆起带两端的现今地壳活动十分强烈,并同时兼有拉张破裂趋势这一重要的构造事件。
In order to visualize the detail motion among stations within the Shanxi graben,we build the No-Net-Rotation based on the GPS repeat observations from 1999 to 2007 of the crustal motion observation network in China.Then the spatial distribution feature of strain fields are analyzed by graphic element method,and the dynamic mechanism of crustal deformation is also deeply analyzed.The results show that present tectonic strain fields of Shanxi graben present tensile strain with NNW-SSE direction,which has good consistency with the earthquake focal mechanisms and regional long-term tectonic deformation background.And the present crustal movement of Linfen and Datong basin is strong,meanwhile,the Linfen and Datong basin is also the areas with high shear strain.In the end the reason of exceptive deformation area is discussed.Then we put forward a significant tectonic event that the crustal activities of tectonic uplift between the Linfen and Taiyuan basin is fierce,and the tectonic uplift is now undergo intense tension rupture.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2012年第2期195-198,246,共5页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金重点资助项目(40534021)
国家自然科学基金资助项目(40902081,40802075)
国土资源大调查资助项目(1212010914015)
