滇西北地区近年来应力场的数值模拟研究
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摘要
建立滇西北地区三维有限元地质模型,将2009～2016年GPS速度场数据作为数值模拟的位移边界条件,模拟获取该地区的构造应力场。结果表明,在楚雄至滇西北地区整体显示张性应力区;出现由"洱源鹤庆断裂-红河断裂-程海断裂"圈起的低值张性区,区域内部张性应力明显低于外部,这种张应力低值区尤其在区域四周断裂边界处,往往是地壳断裂活动的频发区;曲江断裂北端及元谋-绿汁江断裂南端出现张性应力集中区,是今后重点关注的断裂结点。
In this paper,a three-dimensional finite element model is established for northwest Yunnan province.The tectonic stress field of the area is simulated by using 2009～2016 GPS velocity field data as the displacement boundary condition of numerical simulation.The results show that:Chuxiong to the northwest of Yunnan province shows overall tensional stress;in the area circled by EryuanHeqing,Honghe,Chenghai faults,the internal tensile stress is significantly lower than that of the outside;the low value area,especially around the boundary fault,is often in areas of frequent crustal faulting;the north of Qujiang fault and the south of Lüzhijiang fault present a tensional stress concentration zone,which will be focused on in the future.
In this paper,a three-dimensional finite element model is established for northwest Yunnan province.The tectonic stress field of the area is simulated by using 2009～2016 GPS velocity field data as the displacement boundary condition of numerical simulation.The results show that:Chuxiong to the northwest of Yunnan province shows overall tensional stress;in the area circled by EryuanHeqing,Honghe,Chenghai faults,the internal tensile stress is significantly lower than that of the outside;the low value area,especially around the boundary fault,is often in areas of frequent crustal faulting;the north of Qujiang fault and the south of Lüzhijiang fault present a tensional stress concentration zone,which will be focused on in the future.
引文
[1]石玉涛,高原,吴晶,等.云南地区地壳介质各向异性-快剪切波偏振特性[J].地震学报,2006,28(6):574-585(Shi Yutao,Gao Yuan,Wu Jing,et al.Seismic Anisotropy of the Crust in Yunnan,China:Polarizations of Fast Shear Waves[J].Acta Seismologica Sinica,2006,28(6):574-585)
[2]武艳强,江在森,杨国华,等.利用多面函数整体求解GPS应变场的方法及应用[J].武汉大学学报:信息科学版,2009,34(9):1 085-1 089(Wu Yanqiang,Jiang Zaisen,Yang Guohua,et al.Application and Method of GPS Strain Calculating in Whole Mode Using Multi-Surface Function[J].Geomatics and Information Science of Wuhan University,2009,34(9):1 085-1 089)
[3]杨国华,王琪,王敏,等.云南地区现今地壳水平运动与变形特征[J].大地测量与地球动力学,2003,23(2):7-14(Yang Guohua,Wang Qi,Wang Min,et al.Current Horizontal Crustal Movement and Deformation Characteristics in Yunnan Area[J].Journal of Geodesy and Geodynamics,2003,23(2):7-14)
[4]李玉江,陈连旺,李红,等.云南地区构造应力应变场年变化特征的数值模拟[J].大地测量与地球动力学,2009,29(2):13-18(Li Yujiang,Chen Lianwang,Li Hong,et al.Numerical Simulation of Annual Change Characteristics of Tectonic Stress-Strain Field in Yunnan Area[J].Journal of Geodesy and Geodynamics,2009,29(2):13-18)
[5]洪敏,张勇,邵德盛,等.云南地区近期地壳活动特征[J].地震研究,2014,37(10):367-372(Hong Min,Zhang Yong,Shao Desheng,et al.Recent Tectonic Activity Features of Yunnan Region[J].Journal of Seismological Research,2014,37(10):367-372)
[6]邓起东,张培震.中国活动构造基本特征[J].中国科学:D辑,2002,32(12):1 020-1 030(Deng Qidong,Zhang Peizhen.Basic Features of China’s Active Tectonics[J].Science in China:Series D,2002,32(12):1 020-1 030)
[7]杨晓松,马瑾.大陆岩石圈解耦及块体运动讨论——以青藏高原-川滇地区为例[J].地学前缘,2003,10(增1):240-247(Yang Xiaosong,Ma Jin.Continental Lithosphere Decoupling:Implication for Block Movement[J].Earth Scince Frontiers,2003,10(S1):240-247)
[8]吴建平,明跃红,王椿镛.云南地区中小地震及构造应力研究[J].地震学报,2004,26(5):457-465(Wu Jianping,Ming Yuehong,Wang Chunyong.Study on Small and Medium Earthquakes and Tectonic Stress in Yunnan Area[J].Acta Seismologica Sinica,2004,26(5):457-465)
[9]廖思佩,侯强,杜永超.基于GPS形变资料的川滇地区应力场数值模拟研究[J].大地测量与地球动力学,2016,36(7):645-649(Liao Sipei,Hou Qiang,Du Yongchao.Numerical Simulation of the Stress Field in Sichuan-Yunnan Region with GPS Deformation Data[J].Journal of Geodesy and Geodynamics,2016,36(7):645-649)
[10]杨兴悅,陈连旺,杨立明,等.巴颜喀拉块体强震动力学过程数值模拟[J].地震学报,2013,35(3):304-314(Yang Xingyue,Chen Lianwang,Yang Liming,et al.Numerical Simulation on Strong Earthquake Dynamic Process of Bayan Har Block[J].Acta Seismologica Sinica,2013,35(3):304-314)
[11]马宏生.川滇地区强震孕育的深部动力环境研究[D].北京:中国地震局地球物理研究所,2007(Ma Hongsheng.Dynamics Research on Strong Shock Gestation in SichuanYunnan and Its Adjacent Areas[D].Beiing:Institute of Geophysics,CEA,2007)
[2]武艳强,江在森,杨国华,等.利用多面函数整体求解GPS应变场的方法及应用[J].武汉大学学报:信息科学版,2009,34(9):1 085-1 089(Wu Yanqiang,Jiang Zaisen,Yang Guohua,et al.Application and Method of GPS Strain Calculating in Whole Mode Using Multi-Surface Function[J].Geomatics and Information Science of Wuhan University,2009,34(9):1 085-1 089)
[3]杨国华,王琪,王敏,等.云南地区现今地壳水平运动与变形特征[J].大地测量与地球动力学,2003,23(2):7-14(Yang Guohua,Wang Qi,Wang Min,et al.Current Horizontal Crustal Movement and Deformation Characteristics in Yunnan Area[J].Journal of Geodesy and Geodynamics,2003,23(2):7-14)
[4]李玉江,陈连旺,李红,等.云南地区构造应力应变场年变化特征的数值模拟[J].大地测量与地球动力学,2009,29(2):13-18(Li Yujiang,Chen Lianwang,Li Hong,et al.Numerical Simulation of Annual Change Characteristics of Tectonic Stress-Strain Field in Yunnan Area[J].Journal of Geodesy and Geodynamics,2009,29(2):13-18)
[5]洪敏,张勇,邵德盛,等.云南地区近期地壳活动特征[J].地震研究,2014,37(10):367-372(Hong Min,Zhang Yong,Shao Desheng,et al.Recent Tectonic Activity Features of Yunnan Region[J].Journal of Seismological Research,2014,37(10):367-372)
[6]邓起东,张培震.中国活动构造基本特征[J].中国科学:D辑,2002,32(12):1 020-1 030(Deng Qidong,Zhang Peizhen.Basic Features of China’s Active Tectonics[J].Science in China:Series D,2002,32(12):1 020-1 030)
[7]杨晓松,马瑾.大陆岩石圈解耦及块体运动讨论——以青藏高原-川滇地区为例[J].地学前缘,2003,10(增1):240-247(Yang Xiaosong,Ma Jin.Continental Lithosphere Decoupling:Implication for Block Movement[J].Earth Scince Frontiers,2003,10(S1):240-247)
[8]吴建平,明跃红,王椿镛.云南地区中小地震及构造应力研究[J].地震学报,2004,26(5):457-465(Wu Jianping,Ming Yuehong,Wang Chunyong.Study on Small and Medium Earthquakes and Tectonic Stress in Yunnan Area[J].Acta Seismologica Sinica,2004,26(5):457-465)
[9]廖思佩,侯强,杜永超.基于GPS形变资料的川滇地区应力场数值模拟研究[J].大地测量与地球动力学,2016,36(7):645-649(Liao Sipei,Hou Qiang,Du Yongchao.Numerical Simulation of the Stress Field in Sichuan-Yunnan Region with GPS Deformation Data[J].Journal of Geodesy and Geodynamics,2016,36(7):645-649)
[10]杨兴悅,陈连旺,杨立明,等.巴颜喀拉块体强震动力学过程数值模拟[J].地震学报,2013,35(3):304-314(Yang Xingyue,Chen Lianwang,Yang Liming,et al.Numerical Simulation on Strong Earthquake Dynamic Process of Bayan Har Block[J].Acta Seismologica Sinica,2013,35(3):304-314)
[11]马宏生.川滇地区强震孕育的深部动力环境研究[D].北京:中国地震局地球物理研究所,2007(Ma Hongsheng.Dynamics Research on Strong Shock Gestation in SichuanYunnan and Its Adjacent Areas[D].Beiing:Institute of Geophysics,CEA,2007)