广州地区活动断裂的数值模拟
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摘要
根据广州地区地震地质、地球物理、震源机制解以及GPS观测等相关资料,用三维有限元模型,模拟计算了广州地区4条断裂的现今活动方式以及库仑破裂应力年累积速率。数值模拟结果显示:广州-从化断裂活动方式为压性逆冲;瘦狗岭断裂西段为右旋走滑,东段以右旋走滑为主兼逆冲;珠江口断裂西支和东支活动方式均以左旋走滑为主兼逆冲。广州-从化断裂和瘦狗岭断裂东段断裂面上的库仑破裂应力年累积速率明显高于瘦狗岭断裂西段和珠江口断裂西支、东支。数值模拟计算结果与该地区地震活动特征相一致。
On the basis of the related data of seismogeology,geophysics,focal mechanism solutions and GPS a 3D finite element model of active faults in Guangzhou area was built up to simulate recent the motion mode and the Coulomb rupture stress rate p.a.of four active faults in Guangzhou area under the given boundary condition.The computed results are as follows: the motion modes of the south and the north segments of Guangzhou-Conghua fault are both compressive thrust;the motion mode of the west segment of Shougouling fault is right-lateral strike slip while its east segment is dominantly right-lateral strike slip and thrust also;the motion modes of the west and the east branches of Zhujiangkou fault are both left-lateral strike slip and thrust also.The average Coulomb rupture stress rates p.a.of Guangzhou-Conghua fault and the east segment of Shougouling fault are evidently higher than those of the west segment of Shougouling fault and the west and the east branches of Zhujiangkou fault.The simulation results comparatively accord with the seismic activity features in this area.
On the basis of the related data of seismogeology,geophysics,focal mechanism solutions and GPS a 3D finite element model of active faults in Guangzhou area was built up to simulate recent the motion mode and the Coulomb rupture stress rate p.a.of four active faults in Guangzhou area under the given boundary condition.The computed results are as follows: the motion modes of the south and the north segments of Guangzhou-Conghua fault are both compressive thrust;the motion mode of the west segment of Shougouling fault is right-lateral strike slip while its east segment is dominantly right-lateral strike slip and thrust also;the motion modes of the west and the east branches of Zhujiangkou fault are both left-lateral strike slip and thrust also.The average Coulomb rupture stress rates p.a.of Guangzhou-Conghua fault and the east segment of Shougouling fault are evidently higher than those of the west segment of Shougouling fault and the west and the east branches of Zhujiangkou fault.The simulation results comparatively accord with the seismic activity features in this area.
引文
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12陈国能,等.珠江三角洲断裂构造最新活动性研究[J],华南地震,1995,15(3):16-21. Chen Guoneng,et al.Study on the Neotectonics of the faultsin the Pearl River Delta area[J].South China Journal ofSeismology,1995,15(3):16-21.(in Chinese)
13杨马陵.珠江三角洲未来几年地震危险性分析[J].华南地震,2001,21(4):14-21.Yang Maling.Seismic risk analysis of Pearl River Delta ar-ea in some years to come[J].South China Journal of Seis-mology,2001,21(4):14-21.(in Chinese)
2彭卫平,刘伟.广东奥林匹克体育中心场地稳定性评价[J].城市勘测.2005,2:44-51. Peng Weiping and Liu Wei.Field stability evaluation of O-lympic GYM center of Guangdong[J].Urban Reconnais-sance,2005,2:44-51.(in Chinese)
3陈连旺,等.1966年邢台地震引起的华北地区应力场动态演化过程的三维粘弹性模拟[J].地震学报,2001,23(5):480-491. Chen Lianwang,et al.Three dimensional viscoelastic simula-tion on dynamic evolution of stress field in North China in-duced by 1966 Xingtai earthquake[J].Acta SeismologicaSinica,2001,23(5):480-491.(in Chinese)
4陈连旺,等.华北地区三维构造应力场[J].地震学报,1999,21(2):140-149. Chen Lianwang,et al.3D tectonic stress field of North China[J].Acta Seismologica Sinica,1999,21(2):140-149.(in Chinese)
5陈化然,等.川滇地区应力场演化与强震间相互作用的三维有限元模拟[J].地震学报,2004,26(6):567-575. Chen Huaran,et al.3D finite element modeling for evolutionof stress field and interaction among strong earthquakes in Si-chuan-Yunnan region[J].Acta Seismologica Sinica,2004,26(6):567-575.(in Chinese)
6陈连旺,等.华北地区断层运动与三维构造应力场的演化[J].地震学报,2001,23(4):349-361. Chen Lianwang,et al.Evolution of 3D tectonic stress fieldand fault movement in North China[J].Acta SeismologicaSinica,2001,23(4):349-361.(in Chinese)
7张静华,等.华南块体的现今构造运动与内部形变[J].大地测量与地球动力学,2005,25(3):57-62.Zhang Jinghua,et al.Contemporary tectonic movement andinternal deformation of South China block[J].Journal ofGeodesy and Geodynamics,2005,25(3):57-62.(in Chi-nese)
8蒋维强,林纪曾,赵毅.华南地区的小震震源机制与构造应力场[J].中国地震,1992,8(1):36-42. Jiang Weiqiang,Lin Jiceng and Zhao Yi.Focal mechanismof small earthquakes and characteristics of tectonic stressfield in South China[J].Earthquake Research in China,1992,8(1):36-42.(in Chinese)
9张虎男,吴堑虹.华南沿海主要活动断裂带的比较构造研究[J].地震地质,1994,16(1),43-52. Zhang Hunan and Wu Qianhong.A Comparative study ofmain active fault zones along the coast of South China[J].Seismology and Geology,1994,16(1):43-52.(in Chi-nese)
10黄日恒.珠江三角州地区地震危险性刍议[J].华南地震,1998,15(1),64-69. Huang Riheng.The earthquake risk of Pearl River Delta re-gion[J].South China Journal of Seismology,1998,15(1):64-69.(in Chinese)
11严国柱.广州-从化断裂构造带的基本特征及其形成演化的研究[J].华南地震,1986,6(4):8-21. Yan Guozhu.Study on basic feature and evolvement ofGuangzhou-Conghua fault tectonic zone[J].South ChinaJournal of Seismology,1986,6(4):8-21.(in Chinese)
12陈国能,等.珠江三角洲断裂构造最新活动性研究[J],华南地震,1995,15(3):16-21. Chen Guoneng,et al.Study on the Neotectonics of the faultsin the Pearl River Delta area[J].South China Journal ofSeismology,1995,15(3):16-21.(in Chinese)
13杨马陵.珠江三角洲未来几年地震危险性分析[J].华南地震,2001,21(4):14-21.Yang Maling.Seismic risk analysis of Pearl River Delta ar-ea in some years to come[J].South China Journal of Seis-mology,2001,21(4):14-21.(in Chinese)
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