1999～2001年南北地震带GPS综合观测解的负位错模型
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摘要
利用1999～2001年中国大陆GPS最优综合观测解资料,借助改进的负位错模型,研究南北地震带及其邻近区域活动块体与其边界断裂的构造变形特征,获取高应力应变积累的闭锁区段及可能与强震孕育有关的背景信息。分析表明:祁连山断裂带与海原断裂和日月山断裂交汇区、日月山断裂南段与拉脊山断裂、宗务隆山-西秦岭北缘断裂交汇部位;盐源-丽江地块及NE向延伸至川滇交界的安宁河、则木河断裂交汇区及其临近区域;鲜水河至安宁河断裂北段以及与龙门山断裂交汇部位、滇西南边界的永德龙陵-澜沧-勐遮断裂及其北段与怒江断裂交汇区域可能具有高应变能积累背景。而阿尔金断裂中段、海原断裂东段、库玛断裂东端、红河断裂中东段与元谋-绿汁江断裂及小江断裂的交汇区域也可能存在一定程度的应变积累背景。
Using synthetic solution of GPS observation of Chinese Mainland during 1999～2001,aided by improved negative dislocation model,the tectonic deformation characteristics of active blocks and their boundary faults of the South-North seismic belt are discussed,so are the locked segments reflecting accumulation of high stress-strain and background relating to development of strong earthquakes.The analysis shows that:zones of convergence of Qilianshan fault zone and Haiyuan fault and Riyueshan fault;of the south segment of Riyueshan faults and Lajishan fault;of Zongwulongshan fault and the northern margin fault of west Qinling;of Yanyuan-Lijiang block and its northeastward extending to the boundary between Sichuan and Yunnan and its neiboring areas;of Xianshuihe fault and north segment of Anninghe fault and the Longmenshan fault;of Yongde-Longlin fault and Lancang-Mengzhe fault of the southwestern boundary of Yunnan,there probably have background of high strain energy accumulation in these convergence areas.In addition,the medium segment of A'erjin fault,the east segment of Haiyuan fault,the east end of Kuma fault,the medium-east segment of Honghe fault and the place,Yuanmou-Luzhijiang fault and Xiaojiang fault,there may also exist background of strain accumulation in these areas.
Using synthetic solution of GPS observation of Chinese Mainland during 1999～2001,aided by improved negative dislocation model,the tectonic deformation characteristics of active blocks and their boundary faults of the South-North seismic belt are discussed,so are the locked segments reflecting accumulation of high stress-strain and background relating to development of strong earthquakes.The analysis shows that:zones of convergence of Qilianshan fault zone and Haiyuan fault and Riyueshan fault;of the south segment of Riyueshan faults and Lajishan fault;of Zongwulongshan fault and the northern margin fault of west Qinling;of Yanyuan-Lijiang block and its northeastward extending to the boundary between Sichuan and Yunnan and its neiboring areas;of Xianshuihe fault and north segment of Anninghe fault and the Longmenshan fault;of Yongde-Longlin fault and Lancang-Mengzhe fault of the southwestern boundary of Yunnan,there probably have background of high strain energy accumulation in these convergence areas.In addition,the medium segment of A'erjin fault,the east segment of Haiyuan fault,the east end of Kuma fault,the medium-east segment of Honghe fault and the place,Yuanmou-Luzhijiang fault and Xiaojiang fault,there may also exist background of strain accumulation in these areas.
引文
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[2] 伍吉仓,陈永奇.一种板块边界断层运动的力学模型[J].地壳形变与地震,2000,20(2):8～14.
[3] 何玉梅,姚振兴.中国台湾南部及其周边岛屿现今地壳形变的位错模型[J].地球物理学报,2002,45(5):638～645.
[4] OkadaY.Surfacedeformationduetoshearandtensilefaultsinahalf-space[J].BulletinoftheSeismologicalSocietyofAmerica,1985,75(4):1135～1154.
[5] 张希,江在森,张晓亮,等.华北地区近期地壳水平运动的非震负位错反演[J].大地测量与地球动力学,2002,22(3):40～45.
[6] 张希,江在森,王琪,等.1999～2001年青藏块体东北缘地壳水平运动的非震反位错模型及变形分析[J].地震学报,2003,25(4):374～381.
[7] 张希,江在森,王琪,等.川滇地区近期地壳水平运动特征与强震关系研究[J].大地测量与地球动力学,2003,23(3):35～41.
[8] 向宏发,虢顺民,徐锡伟,等.川滇南部地区活动地块划分与现今运动特征初析[J].地震地质,2000,22(3):253～264.
[9] 谢富仁,苏刚,崔效锋,等.滇西南地区现代构造应力场分析[J].地震学报,2001,23(1):17～23.
[10] 王庆廷,熊熊,蒋福珍.三江地区盐源-丽江及川滇地块的地震活动与构造运动态势[J].大地测量与地球动力学,2002,22(2):91～96.
[11] 陈章立.我国地震科技进步的回顾与展望(二)[J].中国地震,2001,17(4):326～341.
[12] 刘建中.缅甸弧的俯冲作用及川滇断块的地震地质特征[J].中国地震,1992,8(1):68～75.
[13] 徐锡伟,程国良,于贵华,等.川滇菱形块体顺时针转动的构造学与古地磁学证据[J].地震地质,2003,25(1):62～70.
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