天津地区GPS站点的微动态变化特征研究
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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.
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.
引文
1武汉测绘学院大地测量系地震测量教研组.大地形变测量[M].北京:地震出版社,1980.(The Seismic SurveyingTeaching in Geodesy-Department of Wuhan Surveying-Map-ping Institute.Geodetic deformation surveying[M].Beijing:Earthquake Press,1980)
2郭良迁,薄万举,胡新康.天津地区的水平应变场特征[J].大地测量与地球动力学,2010,(5):8-14.(Guo Li-angqian,Bo Wanju and Hu Xinkang.Characteristics of hori-zontal strain field in Tianjing[J].Journal of Geodesy andGeodynamics,2010,(5):8-14)
3周海涛,等.天津地区地壳垂向形变(GPS)与文安地震[J].大地测量与地球动力学,2010,(5):32-37.(ZhouHaitao,et al.Wenan earthquake and vertical crustal deforma-tion(with GPS)in Tianjin area[J].Journal of Geodesy andGeodynamics,2010,(5):32-37)
4董克刚,等.利用GPS监测天津市地面沉降的可行性研究[J].大地测量与地球动力学,2008,(4):68-71.(Dong Kegang,et al.Study on monitoring land subsidence inTianjin with GPS[J].Journal of Geodesy and Geodynamics,2008,(4):68-71)
5黄立人,匡绍君,杨贵业.GPS观测得到的天津地区的现今形变[J].大地测量与地球动力学,2002,(4):17-20.(Huang Liren,Kuang Shaojun and Yang Guiye.Recent de-formation deduced from GPS bservation in Tianjin area[J].Journal of Geodesy and Geodynamics,2002,22(4):17-20)
6郭良迁,等.GPS连续站的基线变化与青藏块体的现代活动[J].大地测量与地球动力学,2009,(4):10-14.(GuoLiangqian,et al.Baseline variation of GPS continuous sitesand current activity of Qinghai-Tibet block[J].Journal ofGeodesy and Geodynamics,2009,(4):10-14)
2郭良迁,薄万举,胡新康.天津地区的水平应变场特征[J].大地测量与地球动力学,2010,(5):8-14.(Guo Li-angqian,Bo Wanju and Hu Xinkang.Characteristics of hori-zontal strain field in Tianjing[J].Journal of Geodesy andGeodynamics,2010,(5):8-14)
3周海涛,等.天津地区地壳垂向形变(GPS)与文安地震[J].大地测量与地球动力学,2010,(5):32-37.(ZhouHaitao,et al.Wenan earthquake and vertical crustal deforma-tion(with GPS)in Tianjin area[J].Journal of Geodesy andGeodynamics,2010,(5):32-37)
4董克刚,等.利用GPS监测天津市地面沉降的可行性研究[J].大地测量与地球动力学,2008,(4):68-71.(Dong Kegang,et al.Study on monitoring land subsidence inTianjin with GPS[J].Journal of Geodesy and Geodynamics,2008,(4):68-71)
5黄立人,匡绍君,杨贵业.GPS观测得到的天津地区的现今形变[J].大地测量与地球动力学,2002,(4):17-20.(Huang Liren,Kuang Shaojun and Yang Guiye.Recent de-formation deduced from GPS bservation in Tianjin area[J].Journal of Geodesy and Geodynamics,2002,22(4):17-20)
6郭良迁,等.GPS连续站的基线变化与青藏块体的现代活动[J].大地测量与地球动力学,2009,(4):10-14.(GuoLiangqian,et al.Baseline variation of GPS continuous sitesand current activity of Qinghai-Tibet block[J].Journal ofGeodesy and Geodynamics,2009,(4):10-14)
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