华北地区水平形变场动态变化分析

Dynamic Variations of the Horizontal Deformation Field in North China

为从整体上把握区域应变场的时-空变化态势并更加真实地描述区域运动场,本文在区域整体无旋转基准的基础上,从连续变化的角度出发,利用多核函数进行滤波与解析,对"中国地壳运动观测网络"在华北地区最近10年的GPS复测资料(1999年、2001年、2004年、2007年和2009年)进行了处理,结合各时段的形变结果分析形变场的动态变化。结果表明:①位于张—渤断裂带的京津及周围地区是一个与邻近地区运动不相同的差异运动地区,也是一个左旋运动相对亏损的部位,而且持续时间较长;②山西断陷带北段为左旋压性活动,南段为右旋压性活动,与地质上右旋拉张活动不完全吻合;③郯—庐断裂带的活动在空间上为左旋、右旋交替活动,并非完全是右旋活动,就断层的拉张性而言,该带为"北压南张";④太原—石家庄—济南—临沂以南的地区是当前形变的突出条带。

In order to grasp the space-time variation of regional strain field holistically,and to describe the regional movement field more objectively,on the basis of region with no-net-rotate datum and from the point of continuous variation,we applies multi-kernel function in filtering the repeated measurements from GPS monitoring stations in north China during the recent 10 years（1999,2001,2004,2007 and 2009） in the project of China Crust Movement Measuring Network,and analyzes the dynamic variation fields.The results suggest： ① Beijing and Tianjin and their surrounding regions located in Zhang-Bo Zone are the differential motion area compared with their neighborhood,and also are depletion areas of left lateral movement,and have lasted for a long time;② The north segment of Shan Xi fault is left lateral compressive activities and south of it is right lateral compressive,which is not completely consistent with the geological result of right lateral extension;③ The activity of Tanlu fault is left and right lateral alternation on space,and is not totally right lateral,and in term of fault extension,this fault is ＇compressive in north and extensive in south＇;④ The region between south of Taiyuan-Shijiazhuang and north of Jinan is the obvious deformation region during the recent years.