用(DDA+FEM)方法数值模拟1975年海城、1999年岫岩地震发生的过程
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摘要
用非连续变形分析方法(DDA+FEM), 数值模拟了华北地区各地块相互制约构造环境中发生的1975年海城地震及1999年岫岩地震的过程. 通过对岫岩前震及近期余震分布图象的研究, 以及前人对海城地震的研究, 提出了海城、岫岩地震发震构造块体模型. 数值模拟结果给出了两次地震释放的主应力变化、最大剪应力变化等值线图, 地震前后位移变化矢量图, 及发震断层滑移随时间的变化, 分别与相应地震的震源机制、宏观等震线、发震断层的走滑性质等的结果基本一致.
In this paper, using discontinuous deformation analysis, we simulate numerically the processes of the 1975 Haicheng earthquake and the 1999 Xiuyan earthquake in the tectonic environment of North China where blocks restrict each other by DDA+FEM. Based on the research on the distribution of foreshocks and recent aftershocks of Xiuyan earthquake and the results from study of Haicheng earthquake, we present a tectonic block model of Haicheng and Xiuyan earthquakes. The results from numerical simulation include the variation of principal stress field released by these two earthquakes, contour patterns of maximum shear stress change, variation patterns of displacement vectors before and after the earthquakes and variation of the earthquake fault slip with time, which agree basically with the focal mechanisms, macroscopic isoseismal and horizontal displacement characters from observations.
In this paper, using discontinuous deformation analysis, we simulate numerically the processes of the 1975 Haicheng earthquake and the 1999 Xiuyan earthquake in the tectonic environment of North China where blocks restrict each other by DDA+FEM. Based on the research on the distribution of foreshocks and recent aftershocks of Xiuyan earthquake and the results from study of Haicheng earthquake, we present a tectonic block model of Haicheng and Xiuyan earthquakes. The results from numerical simulation include the variation of principal stress field released by these two earthquakes, contour patterns of maximum shear stress change, variation patterns of displacement vectors before and after the earthquakes and variation of the earthquake fault slip with time, which agree basically with the focal mechanisms, macroscopic isoseismal and horizontal displacement characters from observations.
引文
白武明,林邦慧,陈祖安.2003.1976年唐山大震发生对华北地区各地块运动与变形影响的数值模拟研究[J].中国科学,D辑,33(增刊):99~107
蔡永恩,何涛,王仁.1999.1976年唐山地震震源动力学过程的数值模拟[J].地震学报,21(5):469~477
陈学忠,盖增喜,周仕勇,等.2001.1999年11月29日辽宁岫岩5.4级地震序列的破裂过程研究[J].地震学报,23(6):659~662
陈祖安,白武明,林邦慧,等.2003.1966年以来华北地区一系列七极大震破裂过程的数值模拟[J].地球物理学报,46(3):373~282
邓起东,范福田.1980.华北地区新生代、现代地质构造特征,华北地区的形成与发展[M].北京:科学出版社,192-205
顾浩鼎,陈运泰,高祥林,等.1976.1975年2月4日辽宁省海城地震的震源机制[J].地球物理学报,19(4):270~284
朱凤鸣,吴戈等.1978.海城地震[M].北京:地震出版社,115~116
林邦慧,陈运泰,魏富胜.1979.不对称双侧破裂过程的研究及其在海城地震的应用[J].地震学报,1(2):133~149
林邦慧,白武明,周冉.1989.1975年海城地震序列发生过程的数值模拟[A].中国地球物理学会编辑委员会编.八年代中国地球物理学进展[C].北京:学术书刊出版社,73~82
石根华.1997.《数值流形方法与非连续变形分析》.北京:清华大学出版社,92~96
许忠淮,汪素云,黄雨蕊,等.1989.由大量的地震资料推断我国大陆构造应力场[J].地球物理学报,32(6):636~647
张萍,蒋秀琴.2001.岫岩海城MS5.4地震序列的震源机制解及应力场的情况[J].地震地磁观测与研究,22(3):76~82
张群,潘科,张海莹,等.2001.岫岩海城MS5.4地震序列空间分布特征的探讨[J].地震地磁观测与研究,22(3):83~91
CiparJ.1979.Source precesses of theHaichengChina earthquake from observations of theP andS waves[J].BullSeismSocAmer,69:1903~1916
LiuLanbo.1999.Modeling aseismic fault slip and block deformation in northernChina byDDA[A].Proceedings of theFirstInternationalForum onDDA andSimulation ofDiscontinousMedia[C].Berkley,California,373~382
ShiG.1988.DiscontinuousDeformationAnalysis:A NewMethod forComputingStress,Strain, andSliding ofBlockSystem[D]:[PhD thesis].University ofCalifornia,Berkley,381~393
ShenZhengkang,ZhaoChengkun,AnYin, et al.2000.Contempory crustal deformation in eastAsia constrained byGlobalPositionSystem measurements[J].J GeophysRes,105(3):5721~5734
蔡永恩,何涛,王仁.1999.1976年唐山地震震源动力学过程的数值模拟[J].地震学报,21(5):469~477
陈学忠,盖增喜,周仕勇,等.2001.1999年11月29日辽宁岫岩5.4级地震序列的破裂过程研究[J].地震学报,23(6):659~662
陈祖安,白武明,林邦慧,等.2003.1966年以来华北地区一系列七极大震破裂过程的数值模拟[J].地球物理学报,46(3):373~282
邓起东,范福田.1980.华北地区新生代、现代地质构造特征,华北地区的形成与发展[M].北京:科学出版社,192-205
顾浩鼎,陈运泰,高祥林,等.1976.1975年2月4日辽宁省海城地震的震源机制[J].地球物理学报,19(4):270~284
朱凤鸣,吴戈等.1978.海城地震[M].北京:地震出版社,115~116
林邦慧,陈运泰,魏富胜.1979.不对称双侧破裂过程的研究及其在海城地震的应用[J].地震学报,1(2):133~149
林邦慧,白武明,周冉.1989.1975年海城地震序列发生过程的数值模拟[A].中国地球物理学会编辑委员会编.八年代中国地球物理学进展[C].北京:学术书刊出版社,73~82
石根华.1997.《数值流形方法与非连续变形分析》.北京:清华大学出版社,92~96
许忠淮,汪素云,黄雨蕊,等.1989.由大量的地震资料推断我国大陆构造应力场[J].地球物理学报,32(6):636~647
张萍,蒋秀琴.2001.岫岩海城MS5.4地震序列的震源机制解及应力场的情况[J].地震地磁观测与研究,22(3):76~82
张群,潘科,张海莹,等.2001.岫岩海城MS5.4地震序列空间分布特征的探讨[J].地震地磁观测与研究,22(3):83~91
CiparJ.1979.Source precesses of theHaichengChina earthquake from observations of theP andS waves[J].BullSeismSocAmer,69:1903~1916
LiuLanbo.1999.Modeling aseismic fault slip and block deformation in northernChina byDDA[A].Proceedings of theFirstInternationalForum onDDA andSimulation ofDiscontinousMedia[C].Berkley,California,373~382
ShiG.1988.DiscontinuousDeformationAnalysis:A NewMethod forComputingStress,Strain, andSliding ofBlockSystem[D]:[PhD thesis].University ofCalifornia,Berkley,381~393
ShenZhengkang,ZhaoChengkun,AnYin, et al.2000.Contempory crustal deformation in eastAsia constrained byGlobalPositionSystem measurements[J].J GeophysRes,105(3):5721~5734
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