台湾海峡两岸地壳相对运动分析
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摘要
利用1995～2003年福建GPS测站与台北和桃园核心基准站资料,计算了福建GPS各测站与台北和桃园之间的边长及其相对变化,同时利用遗传算法计算了台北和桃园测点的主应变和方向角。计算结果表明,在1995～1997年和2001～2003年间台海两岸的地壳相对运动都处于拉张状态,但两期拉张的主应变大小和方向有较大变化,这种变化可能反映了1999年台湾集集7.6级地震前后应变积累与释放的过程。
On the basis of the data of Fujian GPS stations, TAIW and TWTF key observation stations during 1995 to 2003,the variations and relative variations of the lengths between Fujian GPS stations and TAIW and TWTF stations are calculated, in the meantime,strain tensors of TAIW and TWTF stations are also calculated with genetic algorithm. The results show that the crustal relative movement of Taiwan strait is in the tensile state during both the periods of 1995 to 1997 and 2001 to 2003, but the magnitude and the direction of principal strain in the two periods are with a wide variation that may reflect the process of strain energy from accumulation to release before and after the M7.6 Chi-Chi earthquake in 1999.
On the basis of the data of Fujian GPS stations, TAIW and TWTF key observation stations during 1995 to 2003,the variations and relative variations of the lengths between Fujian GPS stations and TAIW and TWTF stations are calculated, in the meantime,strain tensors of TAIW and TWTF stations are also calculated with genetic algorithm. The results show that the crustal relative movement of Taiwan strait is in the tensile state during both the periods of 1995 to 1997 and 2001 to 2003, but the magnitude and the direction of principal strain in the two periods are with a wide variation that may reflect the process of strain energy from accumulation to release before and after the M7.6 Chi-Chi earthquake in 1999.
引文
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14黄昭,王善雄.台湾海峡滨海断裂带的构造特征与活动性[J].大地测量与地球动力学,2006,26(3):16～26.Huang Zhao and Wang Shanxiong.Tectonic features and activity of Binhai fault zone in Taiwan strait[J].Journal of Geodesy and Geodynamics,2006,26(3):16-26.(in Chinese)
2刘序俨,等.福建沿海地壳运动与GPS测量结果初步分析[J].地壳形变与地震,1999,19(3):40～47.Liu Xuyan,et al.Primary analysis of the crustal movement and GPS observation data in Fujian coast[J].Crustal De-formation and Earthquake,1999,19(3):40-47.(in Chi-nese)
3周硕愚,等.中国大陆东南边缘海现时地壳运动与地震动力学综合研究[J].地壳形变与地震,2001,21(1):1～13.Zhou Suoyu,et al.Integrated research on current crustal movement and earthquake dynamics in marginal sea,south-east of China continent[J].Crustal Deformation and Earth-quake,2001,21(1):1-13.(in Chinese)
4史粦华.福建及邻区现今地壳运动与形变[J].大地测量与地球动力学,2005,25(3):69～74.Shi Linhua.Present-day crustal movement and deformation in Fujian province and adjacent area[J].Journal of Geodesy and Geodynamics,2005,25(3):69-74.(in Chinese)
5李延兴,等.台湾集集7.6级地震前后福建沿海地区的地壳运动[J].大地测量与地球动力学,2006,26(2):5～9.Li Yanxing,et al.Crustal movement in coastal area of Fu-jian before and afterM7.6Chi-Chi earthquake[J].Journal of Geodesy and Geodynamics,2006,26(2):5-9.(in Chinese)
6丁学仁,等.福建地区地块运动时空变化特征研究[J].大地测量与地球动力学,2006,26(2):58～61.Ding Xueren,et al.Study on space-time variation charac-teristics of crustal movement of tectonic blocks in Fujian area[J].Journal of Geodesy and Geodynamics,2006,26(2):58-61.(in Chinese)
7郭逢英,等.GPS测量揭示的福建沿海地区的现今地形变[J].大地测量与地球动力学,2003,23(3):87～92.Guo Fengying,et al.Crustal deformation along coast of Fujian revealed by GPS[J].Journal of Geodesy and Geodynamics,2003,23(3):87-92.(in Chinese)
8张静华,等.华南块体的现今构造运动与内部形变[J].大地测量与地球动力学,2005,25(3):57～62.Zhang Jinghua,et al.Contemporary tectionic movement and internal deformation of South China block[J].Journal of Geodesy and Geodynamics,2005,25(3):57-62.(in Chinese)
9史粦华,等.台湾两次7级地震前后福建沿海地区地壳运动的变化[J].大地测量与地球动力学,2007,27(5):5～12.Shi Linhua,et al.crustal movement change of coastal areas of Fujian surveyed by GPS before and after twoM7earthquakes in Taiwan[J].Journal of Geodesy and Geodynamics,2007,27(5):5-12.(in Chinese)
10吴绍祖,等.福建地区现今地壳运动变化特征研究[J].华南地震,2005,25(3):87～94.Wu Shaozu,et al.Study on the variation characteristics of modern crustal movement in Fujian[J].South China Jour-nal of Seismology,2005,25(3):87-94.(in Chinese)
11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.Shi Yaolin and Zhu Shoubiao.Discussion on method of cal-culating strain with GPS displacement data[J].Journal of Geodesy and Geodynamics,2006,26(1):1-8.(in Chi-nese)
12孙达,蒲英霞.地图投影[M].南京:南京大学出版社,2005.Sun Da and Pu Yingxia.Map projections[M].Nanjing:Press of Nanjing university,2005.(in Chinese)
13刘序俨.应变固体潮主应变及剪应变的计算——四川姑咱台应变固体潮分析[J].地球物理学报,1994,37(增刊2):213～221.Liu Xuyan.Analysis on earth strain tide of Guza seismic station[J].Acta Geophysica Sinica,1994,37(Supp.2):213-221.(in Chinese)
14黄昭,王善雄.台湾海峡滨海断裂带的构造特征与活动性[J].大地测量与地球动力学,2006,26(3):16～26.Huang Zhao and Wang Shanxiong.Tectonic features and activity of Binhai fault zone in Taiwan strait[J].Journal of Geodesy and Geodynamics,2006,26(3):16-26.(in Chinese)
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