华北平原及其临区现今地壳形变特征  

Current Crustal Deformation of the North China Plain and Its Adjacent Regions

作　　者：刘同文[1] 王慧敏 吴啸龙[3] 张志进[1] LIU Tongwen;WANG Huimin;WU Xiaolong;ZHANG Zhijin(Shandong Institute of Surveying Mapping of Geology Research and Department, Jinan 250002, China;Shandong Land Space Data and Remote Sensing Technology Institute, Jinan 250000, China;College of Geomatics, Xi’ an University of Science and Technology, Xi’ an 710054, China)

机构地区：[1]山东省地质测绘院,山东济南250002 [2]山东省国土空间数据和遥感技术研究院,山东济南250000 [3]西安科技大学测绘科学与技术学院,陕西西安710054

出　　处：《测绘科学技术学报》2021年第2期117-123,共7页Journal of Geomatics Science and Technology

基　　金：陕西省教育厅2019年度专项科学研究计划(19JK0523)。

摘　　要：华北平原及其周缘地壳是我国境内西太平板块北西(NW)向挤压与青藏高原北东(NE)向扩张两大构造机制的交汇部位。首先基于研究区域的实测GPS速度场计算了研究区域无整体旋转速度场;然后采用基于球坐标的最小二乘配置模型整体解算了研究区域GPS应变场;最后利用震源机制解数据反演了区域地壳最大、最小主应力分布,据此研究区域地壳岩石圈整体的地壳形变空间分布特征。结果显示,研究区域地壳岩石圈现今构造形变刚性特征明显,盆地沉陷与断层活动共同控制着研究区域内部的相对形变场,面膨胀值空间分布与区域主要盆地构造具有较好的一致性。而郯庐断裂展布区与华北盆地北缘部位是研究区域地壳的两条重要剪切形变带。其中,郯庐断裂在渤海湾南北两侧的形变特征存在较为显著的差异变化,且该差异可能与地壳岩石圈应力场的空间差异性相关。The North China Plain and its adjacent regions locate on the intersection of NW compression from West Pacific Plate and the NE extension of Qinghai-Tibet Plateau.Firstly,the non-rotation velocity according to the GPS observations is calculated in the paper.Then,the least squares collocation model is utilized to calculate the GPS strain filed on the surface of global spherical model.Finally,combined with the regional maximum and minimum compressive stress axis distributions inversed from focal mechanisms,the main deformation characteristics of the crust and lithosphere are studied.Results show that the overall characteristics of regional crust indicate a rigid behavior.In detail,subsidence of the basin and active faults control the internal relative deformation field together.The dilatation strain rate distribution has a good consistency with the regional basins,and there are two important shear deformation zones which are Tan-lu fault zone and the northern tectonic front of the North China Basin.Tan-lu fault zone shows obviously different activity characteristics on southern and northern sides of Bohai Bay,which can be related to the difference of the crustal stress field structures.

关 键 词：华北盆地 郯庐断裂 无整体旋转速度场 GPS应变场 震源机制解 地壳应力场 

分 类 号：P228[天文地球—大地测量学与测量工程]