利用最小二乘配置方法研究张家口-渤海地震带周边地区应变场
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摘要
利用张家口-渤海地震带周边地区1999、2001、2004、2007、2008、2009年6期143个GPS站的流动观测数据,给出了1999—2009年张家口-渤海地区水平形变运动速度场,并应用最小二乘配置方法获得了区域应变场分布图像和形变图像。区域形变分布初步显示:1)相对于欧亚板块,其年平均最大变化为5～6 mm/a;2)张家口-渤海地震带具有2.0 mm/a左右的左旋走滑运动,其耦合深度为25～45 km;3)研究区内最大剪切应变为3×10-8/a,高值区集中在北京-天津及唐山地区。
We collected and combined all mobile GPS data between 1999 and 2009 around Zhangjiakou-Bohai seismic belt,and obtained the velocities at 143 stations.At the same time,we constructed a regional strain field of the Zhangjiakou-Bohai seismic belt region with least-square collocation,and investigated the slip rate of Zhangjiakou-Bohai belt.The study results show that: 1) the regional maximum displacement is about 5 mm/a,2) Zhangjiakou-Bohai seismic belt is creeping in with left-lateral slip rate of 2.0 mm/a and the creeping depth is in a range of 25-45 km,3) The maximum shear strain is 3×10-8/a in Beijing-Tianjin and Tangshan area.
We collected and combined all mobile GPS data between 1999 and 2009 around Zhangjiakou-Bohai seismic belt,and obtained the velocities at 143 stations.At the same time,we constructed a regional strain field of the Zhangjiakou-Bohai seismic belt region with least-square collocation,and investigated the slip rate of Zhangjiakou-Bohai belt.The study results show that: 1) the regional maximum displacement is about 5 mm/a,2) Zhangjiakou-Bohai seismic belt is creeping in with left-lateral slip rate of 2.0 mm/a and the creeping depth is in a range of 25-45 km,3) The maximum shear strain is 3×10-8/a in Beijing-Tianjin and Tangshan area.
引文
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10 Savage J C,Svarc J L and Prescott W H.Geodetic esti-mates of failt slip rates in the San Francisco Bay area[J].JGeophys R.,1999,104(B3):4 995-5 002.
11 El-Fiky G S and Kato T.Continuous distribution of horizon-tal strain in the Tohoku district,Japan,predicted by least-square collocation[J].Journal of Geodynamics,1999,27:213-236.
12 Moritz H.Advanced least-squares methods[D].Rep 175Dep Geod Sci.,The Ohio State Univ.,Columbus,USA,1972.
13 Altamimi Z,et al.ITRF2005:A new release of the interna-tional terrestrial reference frame based on time series of sta-tion positions and earth orientation parameters[J].J Geo-phys R.,2007,112:B04305,doi:10.1029/2006JB004395.
14葛粲,等.华北地区地壳厚度与泊松比研究[J].地球物理学报,2011,54(10):2538-2548.(Ge Can,et al.Study of crustal thickness and Poisson ratio of the NorthChina Craton[J].Chinese J Geophys,2011,54(10):2 538-2 548)
15 Meng G,et al.Crustal deformation in western Sichuan re-gion and implications for 12 May 2008 Ms8.0 earthquake[J].Geochem Geophys Geosyst,2008,9:Q11007,doi:10.1029/2008GC002144.
2方颖,等.张家口-渤海断裂带现今运动状态分析[J].大地测量与地球动力学,2008,(1):11-15.(Fang Ying,etal.Analysis of current movement of Zhangjiakou-Bohai zone[J].Journal of Geodesy and Geodynamics,2008,(1):11-15)
3乔学军,等.首都圈地区现今地壳运动的GPS观测与构造活动模拟[J].武汉大学学报(信息科学),2008,33(7):692-696.(Qiao Xuejun,et al.GPS measurementsand tectonics activity simulation of present-day crustal de-formation in China’s Capital region[J].Geomatics and In-formation Science of Wuhan University,2008,33(7):692-696)
4江在森,等.应用最小二乘配置建立地壳运动速度场与应变场的方法[J].地球物理学报,2010,53(5):1109-1 117.(Jiang Zaisen,et al.The method in establishing strainfield and velocity field of crustal movement using leastsquares collocation[J].Chinese J Geophys,2010,53(5):1109-1 117)
5江在森,等.华北地区近期地壳水平运动与应力应变场特征[J].地球物理学学报,2000,43(5):657-665.(Jiang Zaisen,et al.Characteristics of recent horizontalmovement and strain-stress field in the crust of North China[J].Chinese J Geophys,2000,43(5):657-665)
6沈正康,等.中国大陆现今构造应变率场及其动力学成因研究[J].地学前缘,2003,10:93-99.(Shen Zhenkang,etal.Contemporary tectonic strain rate field of Chinese conti-nent and its geodynamic implications[J].Earth ScienceFrontiers,2003,10:93-99)
7张希,等.对华北GPS监测区近期地壳应变连续分布的估计[J].地震学刊,1999,75(2):17-22.(Zhang Xi,etal.Estimation for continuous distribution of recent crustalstrain in GPS monitoring area of North China[J].Journal ofSeismology,1999,75(2):17-22)
8王辉,等.基于GPS资料反演中国大陆主要断裂现今活动速率[J].地球物理学进展,2010,25(6):1905-1916.(Wang Hui,et al.GPS-constrained inversion of present-dayslip rates along major faults in Chinese mainland[J].Pro-gress in Geophysics,2010,25(6):1 905-1 916)
9王敏,等.现今中国大陆地壳运动与活动块体模型[J].中国科学(D辑),2003,33:22-132.(Wang Min,et al.pres-ent-day crustal movement of Chinese mainland and activeblock model[J].Science in China(series D),2003,33:22-132)
10 Savage J C,Svarc J L and Prescott W H.Geodetic esti-mates of failt slip rates in the San Francisco Bay area[J].JGeophys R.,1999,104(B3):4 995-5 002.
11 El-Fiky G S and Kato T.Continuous distribution of horizon-tal strain in the Tohoku district,Japan,predicted by least-square collocation[J].Journal of Geodynamics,1999,27:213-236.
12 Moritz H.Advanced least-squares methods[D].Rep 175Dep Geod Sci.,The Ohio State Univ.,Columbus,USA,1972.
13 Altamimi Z,et al.ITRF2005:A new release of the interna-tional terrestrial reference frame based on time series of sta-tion positions and earth orientation parameters[J].J Geo-phys R.,2007,112:B04305,doi:10.1029/2006JB004395.
14葛粲,等.华北地区地壳厚度与泊松比研究[J].地球物理学报,2011,54(10):2538-2548.(Ge Can,et al.Study of crustal thickness and Poisson ratio of the NorthChina Craton[J].Chinese J Geophys,2011,54(10):2 538-2 548)
15 Meng G,et al.Crustal deformation in western Sichuan re-gion and implications for 12 May 2008 Ms8.0 earthquake[J].Geochem Geophys Geosyst,2008,9:Q11007,doi:10.1029/2008GC002144.
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