华北地区最近几年水平形变场的含义与讨论
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摘要
在整体无旋转基准的基础上,采用了以提取低频应变信息为主的连续应变模型,按三个时段(1999—2001年、2001—2004年和2004—2007年)处理了华北地区400余个GPS测站复测资料,获取了三个时段的相对运动速率及其相应的主应变率场。结果表明:1999—2007年华北地区水平形变场存在比较明显的差别,不同时段的结果在空间上的表现形式不一样;三个时段的结果与应力场及其动态变化相辅相成——第一时段着重反映背景应力场与昆仑山地震孕震过程中远场的动态应力场共同作用的结果,第二时段体现了昆仑山地震后应力场调整所导致远场变化的结果,第三时段不但体现背景应力场的主导作用,同时还可能影射应力场有所加强的成分。
On the basis of datum without rotation,the authors used continuous strain model focused on extracting low frequency strain information,and processed the repeated measurement data of more than 400 GPS stations in North China for 3 periods of times(1999—2001、2001—2004 and 2004—2007),and obtained the results of relative movement velocities and the corresponding main strain rate fields.The results suggest: there existed obvious differences of the horizontal deformation fields in North China during 1999—2007 and the results of different time periods had different representation forms on space;The results of three time periods were corresponding to the strain fields and the dynamic changes,that is,the result of the first time period mainly reflected the cooperation of the background strain field and dynamic far field during the pregnant period of Kunlun Mountain Earthquake,and the result of the second time period embodied the changing of the far field because of the adjustment after Kunlun Mountain Earthquake,then,the result of the third time period not only embodied the predominant function of the background field,but also probably reflected the fortified components of strain fields.
On the basis of datum without rotation,the authors used continuous strain model focused on extracting low frequency strain information,and processed the repeated measurement data of more than 400 GPS stations in North China for 3 periods of times(1999—2001、2001—2004 and 2004—2007),and obtained the results of relative movement velocities and the corresponding main strain rate fields.The results suggest: there existed obvious differences of the horizontal deformation fields in North China during 1999—2007 and the results of different time periods had different representation forms on space;The results of three time periods were corresponding to the strain fields and the dynamic changes,that is,the result of the first time period mainly reflected the cooperation of the background strain field and dynamic far field during the pregnant period of Kunlun Mountain Earthquake,and the result of the second time period embodied the changing of the far field because of the adjustment after Kunlun Mountain Earthquake,then,the result of the third time period not only embodied the predominant function of the background field,but also probably reflected the fortified components of strain fields.
引文
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[7]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.ZHANG Yue-gang,SHUAI Ping,HU Xin-kang,et al.Study on evolution of deformation field in North China area with GPSdata[J].Journal of Geodesy and Geodynamics,2006,26(1):36-41.
[8]中国地震局监测预报司.强地震中期预测新技术物理基础及其应用研究[M].北京:地震出版社,2008:196-253.
[2]中国地震局监测预报司.2001年昆仑山西口8.1级大地震[M].北京:地震出版社,2002.
[3]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(2):10-15.YANG Guo-hua,JIANG Zai-sen,LIU Xia,et al.Npossible relation of horizontal movement field in North China to Kunlunmountain Ms8.1 earthquake[J].Journal of Geodesy and Geodynamics,2007,27(2):10-15.
[4]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,2005,25(4):6-10.YANG Guo-hua,JIANG Zai-sen,WU Yan-qiang,et al.No-net-rotation on crustal movement of China mainland and its appli-cation[J].Journal of Geodesy and Geodynamics,2005,25(4):6-10.
[5]胡新康,王倩,马青,等.区域无整体旋转基准的研究与应用[J].大地测量与地球动力学,2007,27(2):52-60.HU Xin-kang,WANG Qian,MA Qing,et al.Research and application of regional na-net-rotation reference frame[J].Journalof Geodesy and Geodynamics,2007,27(2):52-60.
[6]杨国华,王敏,韩月萍.华北中北部地壳运动与张北地震[J].中国地震,2001,17(3):301-311.YANG Guo-hua,WANG Min,HAN Yue-ping.Crustal movement in the northern part of North China associated withZhangbei earthquake[J].Earthquake Research in China,2001,17(3):301-311.
[7]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.ZHANG Yue-gang,SHUAI Ping,HU Xin-kang,et al.Study on evolution of deformation field in North China area with GPSdata[J].Journal of Geodesy and Geodynamics,2006,26(1):36-41.
[8]中国地震局监测预报司.强地震中期预测新技术物理基础及其应用研究[M].北京:地震出版社,2008:196-253.
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