华北地区现今水平运动场的动态特征
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摘要
在整体无旋转基准的基础上,采用了以提取中、低频应变信息为主的连续应变模型,处理并分析了《中国地壳运动观测网络》在华北地区400余个GPS测站的复测资料(1999—2001—2004年)和2006年130余个测站的复测资料,获得了1999—2004年、2004—2006年的相对运动速率以及2004—2006年偏离1999—2004年运动的位移结果。结果表明:①华北地区非均匀应变比较明显,不同时段的结果在空间上的表现形式也不一样;②前后两个时段的运动特征具有一定的不一致性;③2006年存在着较明显的偏离位移,并显示了右旋形变的迹象,面应变表现为北、中收缩,南部膨胀的特征;④近两年东西向的压性作用较前明显,北京以南地区是运动的转化地区及面应变象限的准中心地区。这可能表明,在昆仑山口西8.1级地震之后,华北地区又进入了常态能量的积累阶段。
On the basis of region with no-net rotation,and by using continuous strain model focused on extracting medium-low frequency strain information,the paper deals with and analyzes the re-measured GPS data(1999—2001—2004) obtained from more than 400 GPS monitoring stations and also the GPS data re-measured in 2006 from more than 130 GPS monitoring stations in North China in the Project of "China Crust Movement Observation Network".We gain the relative motion velocity of 1999—2004 and 2004—2006,and acquire the displacement results of the deviation motion of 2004—2006 with respect to 1999—2004,the results suggest: ① The uneven strains in North China region are obvious,results of different periods distinct from each other in the spatial representation style;② The movement characteristics of former and latter two periods are inconsistent to a certain extern;③ There exists obvious deviation displacement in 2006,and shows a evidence of right revolving deformation,its the surface strain shows the characteristic of surface contraction in central and north part of the region;and superficial expansion in south part of the region;④ The compression in the EW direction during recent two years is more obvious than before,to south of Beijing it is the area of movement conversion and the quadrant pseudo-center of surface strain.These may suggest that North China region enter the energy-accumulated period after Kunlun Mountain MS8.1 earthquake.
On the basis of region with no-net rotation,and by using continuous strain model focused on extracting medium-low frequency strain information,the paper deals with and analyzes the re-measured GPS data(1999—2001—2004) obtained from more than 400 GPS monitoring stations and also the GPS data re-measured in 2006 from more than 130 GPS monitoring stations in North China in the Project of "China Crust Movement Observation Network".We gain the relative motion velocity of 1999—2004 and 2004—2006,and acquire the displacement results of the deviation motion of 2004—2006 with respect to 1999—2004,the results suggest: ① The uneven strains in North China region are obvious,results of different periods distinct from each other in the spatial representation style;② The movement characteristics of former and latter two periods are inconsistent to a certain extern;③ There exists obvious deviation displacement in 2006,and shows a evidence of right revolving deformation,its the surface strain shows the characteristic of surface contraction in central and north part of the region;and superficial expansion in south part of the region;④ The compression in the EW direction during recent two years is more obvious than before,to south of Beijing it is the area of movement conversion and the quadrant pseudo-center of surface strain.These may suggest that North China region enter the energy-accumulated period after Kunlun Mountain MS8.1 earthquake.
引文
[1]江在森,张希,祝意清,等.昆仑山口西MS8.1地震前区域构造形变背景[J].中国科学(D辑),2003,33(增):163-172.
[2]李延兴,李智,张静华,等.中国大陆及周边地区的水平应变场[J].地球物理学报,2004,47(2):222-231.
[3]Shen Z-K.Optimal estimation of geodetic strains from discretized data.徐秉业,黄筑平.朔性力学和地球动力学进展[M].北京:世界图书出版公司,2000.251-256.
[4]石耀霖,朱守彪.用GPS位移资料计算应变方法的讨论[J].大地测量与地球动力学,2006,26(1):1-8.
[5]Yang Guohua,Han Yueping,Wang Min.Characteristics of Horizontal Crustal Movement in theNorth China in the Last Decade[J].Earthquake Research in China,2004,18(2):115-124.
[6]杨国华,江在森,刘峡,等.华北地区水平运动场动态特征及其与昆仑山8.1级地震的可能关系[J].大地测量与地球动力学,2007,27(1):6-10.
[7]杨国华,江在森,武艳强,等.中国大陆整体无净旋转基准及其应用[J].大地测量与地球动力学,2005,29(4):6-10.
[8]孟国杰,申旭辉,伍吉仓,等.ITRF2000无净旋转对中国大陆地壳形变的影响[J].大地测量与地球动力学,2004,25(1):35-39.
[9]张跃刚,帅平,胡新康,等.从GPS观测看华北地区的形变场演化[J].大地测量与地球动力学,2006,26(1):36-41.
[2]李延兴,李智,张静华,等.中国大陆及周边地区的水平应变场[J].地球物理学报,2004,47(2):222-231.
[3]Shen Z-K.Optimal estimation of geodetic strains from discretized data.徐秉业,黄筑平.朔性力学和地球动力学进展[M].北京:世界图书出版公司,2000.251-256.
[4]石耀霖,朱守彪.用GPS位移资料计算应变方法的讨论[J].大地测量与地球动力学,2006,26(1):1-8.
[5]Yang Guohua,Han Yueping,Wang Min.Characteristics of Horizontal Crustal Movement in theNorth China in the Last Decade[J].Earthquake Research in China,2004,18(2):115-124.
[6]杨国华,江在森,刘峡,等.华北地区水平运动场动态特征及其与昆仑山8.1级地震的可能关系[J].大地测量与地球动力学,2007,27(1):6-10.
[7]杨国华,江在森,武艳强,等.中国大陆整体无净旋转基准及其应用[J].大地测量与地球动力学,2005,29(4):6-10.
[8]孟国杰,申旭辉,伍吉仓,等.ITRF2000无净旋转对中国大陆地壳形变的影响[J].大地测量与地球动力学,2004,25(1):35-39.
[9]张跃刚,帅平,胡新康,等.从GPS观测看华北地区的形变场演化[J].大地测量与地球动力学,2006,26(1):36-41.
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