天津地区GPS站点的微动态变化特征研究  

MICRO-DYNAMIC CHARACTERISTICS OF GPS SITES IN TIANJIN AREA

作　　者：塔拉[1] 郭良迁[1] 刘峡[1] 陈聚忠[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《大地测量与地球动力学》2012年第5期27-32,共6页Journal of Geodesy and Geodynamics

基　　金：天津市应用基础研究(08JCZDJC18900);天津市地面沉降与灾害研究(IS201166002)

摘　　要：根据天津GPS局域网观测资料计算得到各站点的连续位移参量和天津地区整体应变率参量,研究了各站点的微动态位移变化和天津地壳整体微动态应变率。结果显示,2006年上半年和2008年多数站点出现较大幅度的变化,显示出这一时期地壳活动有所增强。2006年上半年站点位移量值是2004—2010年期间最大的,天津地壳应变率在2006年3—4月也达到最大,压应变轴方向显著偏离本区的正常方向(常态为北东东向),其后2006年7月4日在天津西南部附近地带发生了文安Ms5.1地震。在2008年天津地区的部分站点位移量相对增大,可能是受汶川Ms8.0地震产生的远场形变。On the basis of the continuous displacement parameters of each site and the overall strain rate parameters of the Tianjin area obtained from the observational data of Tianjin GPS local network,the micro-dynamic displacement of each site and the micro-dynamic crustal strain rate of the Tianjin area as a whole were studied.The results show that in the first half of 2006 and whole 2008,there was a substantial change in the majority of the sites,which shows that the activity in the crust enhanced in this period.The sites displacement value in the first half of 2006 were the maximum during the period 2004-2010,and crustal strain rate of Tianjin in March-April 2006 also reached the maximum.The compressive strain axis significantly deviated from the normal direction of the area（normal NEE）.On July 4,2006,Wenan Ms5.1 earthquake was occurred near the southwest of Tianjin.The displacements of part sites of the Tianjin area relatively increased in 2008,which may be affected by the far-field deformation of the Wenchuan Ms8.0 earthquake.

关 键 词：GPS形变 微动态位移 应变应力动态变化 构造活动增强 文安地震 

分 类 号：P315.72[天文地球—地震学]