【摘要】 利用张家口-渤海地震带周边地区1999、2001、2004、2007、2008、2009年6期143个GPS站的流动观测数据,给出了1999—2009年张家口-渤海地区水平形变运动速度场,并应用最小二乘配置方法获得了区域应变场分布图像和形变图像。区域形变分布初步显示:1)相对于欧亚板块,其年平均最大变化为5～6 mm/a;2)张家口-渤海地震带具有2.0 mm/a左右的左旋走滑运动,其耦合深度为25～45 km;3)研究区内最大剪切应变为3×10-8/a,高值区集中在北京-天津及唐山地区。更多还原

【Abstract】 We collected and combined all mobile GPS data between 1999 and 2009 around Zhangjiakou-Bohai seismic belt,and obtained the velocities at 143 stations.At the same time,we constructed a regional strain field of the Zhangjiakou-Bohai seismic belt region with least-square collocation,and investigated the slip rate of Zhangjiakou-Bohai belt.The study results show that: 1) the regional maximum displacement is about 5 mm/a,2) Zhangjiakou-Bohai seismic belt is creeping in with left-lateral slip rate of 2.0 mm/a and the creeping depth is in a range of 25-45 km,3) The maximum shear strain is 3×10-8/a in Beijing-Tianjin and Tangshan area.更多还原