环渤海区域及邻区现今地壳构造运动形变特征分析  

Analysis of the Current Tectonic Movement Deformation Characteristics in the Bohai Rim Region and Adjacent Areas

作　　者：赵旭坤[1] 张俊[1] 雷前坤[1] 范成成 ZHAO Xukun;ZHANG Jun;LEI Qiankun;FAN Chengcheng(College of Mining,Guizhou University,Huaxi District,Guiyang 550025,China)

机构地区：[1]贵州大学矿业学院

出　　处：《大地测量与地球动力学》2019年第11期1101-1105,共5页Journal of Geodesy and Geodynamics

基　　金：贵州省科学技术基础研究计划(黔科[2017]1054);贵州大学引进人才科研项目(贵大人基合字(2016)51号);国家自然科学基金(41701464);贵州大学测绘科学与技术研究生创新实践基地建设项目(贵大研CXJD[2014]002)~~

摘　　要：将环渤海区域划分为5个次级块体,利用整体旋转与线性应变模型分析2009~2014年中国大陆构造环境监测网络的GPS对地观测速度场数据,得到相对于欧亚板块0.5°×0.5°的水平运动速度场和应变场。分析形变速度场和应变场的空间变化发现,环渤海区域整体上呈现0.25×10^-9/a的NW-SE111.3°的双向趋势性扩张运动,太行块体、山西块体分别呈NW-SE116.3°、NW-SE130°的微弱扩张运动,胶辽块体、冀鲁块体和阴山-燕山块体分别存在NW-SE144.3°、NE-SW39.5°和NW-SE155.6°的微弱压缩运动,其中太行块体的扩张运动量级相对于其他次级块体较大。尽管环渤海区域内部各次级块体的形变在空间上存在以上差异,但整体上环渤海区域主压应变轴方向基本为NEE-SWW,主张应变轴方向为NNW-SSE,且主压应变轴走向为NE47.70°~89.74°,与利用地球物理方法得到的主压应变轴优势方向大体一致,表明环渤海区域现今地壳运动相对稳定。Based on GPS ground-to-earth observation velocity field data of the continental tectonic environment monitoring network of China mainland in the Bohai rim region from 2009 to 2014,we use the global rotation and linear strain models for calculation.The area is divided into five sub-blocks,and we obtain the strain field of 0.5°×0.5°of the research area relative to the Eurasian plate.The spatial variation of the deformation velocity field and the strain field are analyzed.It is found that the Bohai rim region presents a two-way trend expansion movement of 0.25×10^-9/a NW-SE 111.3°.The strain details of each sub-block are provided:the Taihang block is NW-SE 116.3°,and the Shanxi block is the weak expansion movement of NW-SE 130°.The weak compression movement is NW-SE 144.3°,NE-SW 39.5°and NW-SE 155.6°in the Jiaoliao,Jilu,and Yinshan-Yanshan blocks respectively.The magnitude of the expansion motion of the Taihang block is larger than that of the other secondary blocks.Although the deformation of each sub-block in the Bohai rim region is spatially different,the direction of the main compressive strain axis of the Bohai rim region is basically NEE-SWW,the strain axis is basically NNW-SSE,and the main compressive strain axis direction is NE 47.70°~89.74°,which is generally consistent with the dominant direction of the principal compressive strain axis of the region obtained by geophysical methods,indicating that the current crustal movement in the Bohai sea region is relatively stable.

关 键 词：环渤海区域 GPS速度场 地壳形变 应变场 现今构造运动 

分 类 号：P227[天文地球—大地测量学与测量工程] P313[天文地球—测绘科学与技术]