用边界元法研究川西地区的形变场与应变场
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摘要
将巴颜喀拉地块和四川地块作为研究对象,用块体边界上的GPS位移作为输入数据,应用边界元法计算得到块体边界上的应力,再用求解出的边界应力计算块体内部的位移与应变。结果发现巴颜喀拉块体南北向为张应变作用;块体西侧张应变量较大,向东逐渐减小,到龙门山东侧应变几乎减弱为零。南北向张应变向东的迅速减弱,使得龙门山断层产生闭锁,闭锁使龙门山断裂聚集起巨大的应变能,应变能的大量积累可能是导致汶川地震发生的根本原因。
Takes Bayan Har and Sichuan crustal block as object of study,and takeing GPS displacement on boundary as input data and solves the variation of stress on block boundary,the variation of stress on block bounhdary is solved with Boundary Element Method and the distributions of displacement and strain in the two blocks are calculated and ploted from the stress.It is found out that NStrending tensile strain decreased quickly from west to east in Bayan Har crustal block before Wenchuan Ms8.0 earthquake,thus made the Longmen mountains fault locked,great strain energy accumulated and the earthquake occured.
Takes Bayan Har and Sichuan crustal block as object of study,and takeing GPS displacement on boundary as input data and solves the variation of stress on block boundary,the variation of stress on block bounhdary is solved with Boundary Element Method and the distributions of displacement and strain in the two blocks are calculated and ploted from the stress.It is found out that NStrending tensile strain decreased quickly from west to east in Bayan Har crustal block before Wenchuan Ms8.0 earthquake,thus made the Longmen mountains fault locked,great strain energy accumulated and the earthquake occured.
引文
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2杨少敏,等.用双三次样条函数和GPS资料反演现今中国大陆构造形变场[J].大地测量与地球动力学,2002,(1):68-75.(Yang Shaomin,et al.Contenporary horizontaltectonic deformation in China inversed from GPS observation[J].Journal of Geodesy and Geodynamics,2002,(1):68-75)
3伍吉仓,邓康伟,陈永奇.三角形形状因子对地壳形变计算精度的影响[J].大地测量与地球动力学,2003,(3):26-30.(Wu Jicang,Conrad Tang and Chen Yongqi.Effectsof triangle shape faction on precision of crustal deformationcalculated[J].Journal of Geodesy and Geodynamics,2003,(3):26-30)
4石耀林,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,(1):1-8.(Shi Ya-olin and Zhu Shoubiao.Discussion on method of calculatingstrain with GPS displacement data[J].Journal of Geodesyand Geodynamics,2006,(1):1-8)
5张有天,王镭,陈平.边界元方法及其在工程中的应用[M].北京:水利电力出版社,1989.(Zhang Youtian,Wang Lei and Chen Ping.Boundary element method and itsuse in engineering[M].Beijing:China Water Power Press,1989)
6吴云,等.基于边界元的非连续(块体系统)形变反分析法[J].武汉大学学报(信息科学版),2003,28(3):345-350.(Wu Yun,et al.Inverse analysis method of DDA(blocksystem)based on BEM[J].Geomatics and Information Sci-ence of Wuhan University,2003,28(3):345-350)
7王元淳.边界元法基础[M].上海:上海交通大学出版社,1988.(Wang Yuanchun.Basis of boundary element method[M].Shanghai:Shanghai Jiaotong University Press,1988)
8李延兴,等.汶川Ms8.0地震孕育发生的机制与动力学问题[J].地球物理学报,2009,52(2);519-530.(LiYanxing,et al.The mechanism and dynamics of the genera-tion and occurrence for WenchuanMs8.0 earthquake[J].Chinese J.Geophys,2009,52(2):519-530)
9江在森,等.汶川8.0级地震前区域地壳运动与变形动态过程[J].地球物理学报,2009,52(2);505-518.(JiangZaisen,et al.The dynamic process of regional crustal move-ment and deformation before WenchuanMs8.0 earthquake[J].Chinese J.Geophys,2009,52(2):505-518)
10王卫民,等.四川汶川8.0级地震震源过程[J].地球物理学报,2008,51(5):1 403-1 410.(Wang Weimin,etal.Rupture process of theMs 8.0 Wenchuan earthquake inSichuan,China[J].Chinese J.Geophys,2008,51(5):1 403-1 410)
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