2001年昆仑山口西地震前后山西构造带的应力状态变化
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摘要
运用应力状态定量化参数反演方法(CAM),对发生在山西构造带(简称山西带)1967—2010年期间的地震震源机制数据进行了应力状态反演。按这个时段中国发生的强震和山西省中强地震发生时间对数据进行了分时段研究。研究表明,在2001年昆仑山口西8.1级地震前后山西构造带的最大主压应力轴方向发生了明显变化。该地震前山西带最大主压应力轴方向以NW向分布为主;该地震后山西带的最大主压应力轴转变为NE向分布为主。值得强调的是,在1967—2001年11月各时间段中主压应力轴方向没有明显区别,说明该地震对山西带应力状态变化起了重要作用。当最大主压应力轴为NW向分布时,山西带内的SN向构造段与NE向构造段的应力状态均以水平剪切为主;而当最大主压应力轴转为NE向分布时,山西带内SN向构造的应力状态分布表现为水平剪切,而NE向构造的应力状态分布表现为水平拉张。文中对产生应力主轴方向变化的原因进行了分析。与此同时,对山西带强震分布与构造条件的关系也进行了讨论。
Shanxi tectonic belt is a historically earthquake-abundant area and the focal distribution of the majority of the strong earthquakes is controlled by the local north-south oriented structures on the tectonic belt. Using the cataclastic analysis method(CAM),we performed an inversion analysis on the stress state of focal mechanism solutions of earthquakes which happened on Shanxi tectonic belt from 1967 to 2010.Results show that spatial distributions of the maximum principal compressive stress axis of Shanxi tectonic belt have changed over time,with two different predominant directions,NW and NE,in different periods of time. When the maximum principal compressive stress axis is oriented in NE direction,the stress state is registered as horizontally shearing and horizontally extension on the north-south and southeast oriented local segments in turn. When the maximum principal compressive stress axis is oriented in NW direction,the stress state of north-south and northeast tectonic segments is primarily registered as horizontally shearing.
Shanxi tectonic belt is a historically earthquake-abundant area and the focal distribution of the majority of the strong earthquakes is controlled by the local north-south oriented structures on the tectonic belt. Using the cataclastic analysis method(CAM),we performed an inversion analysis on the stress state of focal mechanism solutions of earthquakes which happened on Shanxi tectonic belt from 1967 to 2010.Results show that spatial distributions of the maximum principal compressive stress axis of Shanxi tectonic belt have changed over time,with two different predominant directions,NW and NE,in different periods of time. When the maximum principal compressive stress axis is oriented in NE direction,the stress state is registered as horizontally shearing and horizontally extension on the north-south and southeast oriented local segments in turn. When the maximum principal compressive stress axis is oriented in NW direction,the stress state of north-south and northeast tectonic segments is primarily registered as horizontally shearing.
引文
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邵辉成,苏刚.1999.鄂尔多斯周缘近期地震活动趋势分析[J].西北地震学报,21(4):119—128.SHAO Hui-cheng,SU Gang.1999.Analysis on the seismicity trend around the Ordos block[J].North Western Seismo-logical Journal,21(4):119—128(in Chinese).
苏刚.1984.以运动地块为单元的区域地震活动研究:鄂尔多斯地块地震活动[J].西北地震学报,6(2):1—10.SU Gang.1984.Research on regional seismicity with active block as compartment:Seismicity of Ordos block[J].NorthWestern Seismological Journal,6(2):1—10(in Chinese).
徐锡伟,程国良,马杏垣,等.1994.华北及其邻区地体转动模式和动力来源[J].地球科学—中国地质大学学报,19(2):129—138.XU Xi-wei,CHENG Guo-liang,MA Xing-yuan,et al.1994.Rotation and dynamics of blocks in North China and its ad-jacent areas[J].Earth Science:Journal of China University of Geosciences,19(2):129—138(in Chinese).
张希,江在森,张晓亮.2002.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,22(3):40—45.ZHANG Xi,JIANG Zai-sen,ZANG Xiao-liang.2002.Aseismic negative dislocation inversion of recent horizontal crustmovement in North China[J].Journal of Geodesy and Geodynamics,22(3):40—45(in Chinese).
Rebetsky Y L.1997a.Reconstruction of tectonic stresses and seismotectonic strains:Methodical fundamentals,currentstress field of southeastern Asia and Oceania[J].Dokl Akad Nauk,354:101—104.
Rebetsky Y L.1997b.Methods for reconstructing tectonic stresses and seismotectonic deformations based on the moderntheory of plasticity[J].Dokl Akad Nauk,370—373.
Rebetsky Y L.2003.Development of the method of cataclastic analysis of shear fractures for tectonic stress estimation[J].Dokl Akad Nauk,388:72—76.
Rebetsky Y L,Marinin A V.2006a.Stress state of Earth's crust in the western region of Sunda subduction zone beforethe Sumatra-Andaman earthquake on December26,2004[J].Dokl Akad Nauk,407:812—815.
Rebetsky Y L,Marinin A V.2006b.Preseismic stress field before Sumatra-Andaman earthquake of26.12.2004:Amodel of metastable state of rocks[J].Geol i Geofiz,47:1173—1185.
Rebetsky Y L.2009a.Estimation of stress values in the method of cataclastic analysis of shear fracture[J].DokladyEarth Sciences,428(7):1202—1207.
Rebetsky Y L.2009b.Stress state of the Earth's crust of the Kurils Islands and Kamchatka before the Simushir earth-quake[J].Russ J Pacific Geol,3(5):477—490.
陈小斌,臧绍先,刘永岗,等.2005.鄂尔多斯地块的现今水平运动状态及其与周缘地块的相互作用[J].中国科学院研究生院学报,22(3):309—314.CHEN Xiao-bin,ZANG Shao-xian,LIU Yong-gang,et al.2005.Horizontal movement of Ordos block and the interactionof Ordos block and adjacent blocks[J].Journal of the Graduate School of the Chinese Academy of Sciences,22(3):309—314(in Chinese).
邓起东,尤惠川.1985.鄂尔多斯周缘断陷盆地带的构造活动特征及其形成机制[A].见:国家地震局地质研究所编.现代地壳运动研究(1).北京:地震出版社.58—78.DENG Qi-dong,YOU Hui-chuan.1985.The forming mechanism and tectonics characteristic around Ordos massif[A].In:Institute of Geology of State Seismological Bureau(ed).Research on Contemporary Movement of Crust(1).Seismological Press,Beijing.58—78(in Chinese).
邓起东,程绍平,闵伟,等.1999.鄂尔多斯块体新生代构造活动和动力学的讨论[J].地质力学学报,5(3):13—21.DENG Qi-dong,CHENG Shao-ping,MIN Wei,et al.1999.Discussion on Cenozoic tectonics and dynamics of Ordosblock[J].Journal of Geomechanics,5(3):13—21(in Chinese).
范俊喜,马瑾,甘卫军.2003.鄂尔多斯地块运动的整体性与不同边界活动的交替性[J].中国科学(D辑),33(Suppl):119—128.FAN Jun-xi,MA Jin,GAN Wei-jun.2003.Movement of Ordos block and alternation of activity along its boundary[J].Sci China(Ser D),46(Suppl):168—180.
胡惠民.1988.鄂尔多斯周缘断裂系的现代地壳运动特征:区域形变场[A].见:国家地震局“鄂尔多斯周缘断裂系”课题组编.鄂尔多斯周缘断裂系.北京:地震出版社.174—182.HU Hui-min.1988.Regional strain field:Contemporary movement property of active Fault system around Ordos massif[A].In:Research Group on Active Fault System around Ordos Massif of State Seismological Bureau(ed).ActiveFault System around Ordos Massif.Seismological Press,Beijing.174—182(in Chinese).
马杏垣.1989.现今地壳应力状态[A].见:马杏垣主编.中国岩石圈动力学地图集.北京:中国地图出版社.20.MA Xing-yuan.1989.State of Recent Crustal Stress[A].In:MA Xing-yuan(ed).Lithospheric Dynamics Atlas of Chi-na.China Cartographic Publishing House,Beijing.20(in Chinese).
邵辉成,苏刚.1999.鄂尔多斯周缘近期地震活动趋势分析[J].西北地震学报,21(4):119—128.SHAO Hui-cheng,SU Gang.1999.Analysis on the seismicity trend around the Ordos block[J].North Western Seismo-logical Journal,21(4):119—128(in Chinese).
苏刚.1984.以运动地块为单元的区域地震活动研究:鄂尔多斯地块地震活动[J].西北地震学报,6(2):1—10.SU Gang.1984.Research on regional seismicity with active block as compartment:Seismicity of Ordos block[J].NorthWestern Seismological Journal,6(2):1—10(in Chinese).
徐锡伟,程国良,马杏垣,等.1994.华北及其邻区地体转动模式和动力来源[J].地球科学—中国地质大学学报,19(2):129—138.XU Xi-wei,CHENG Guo-liang,MA Xing-yuan,et al.1994.Rotation and dynamics of blocks in North China and its ad-jacent areas[J].Earth Science:Journal of China University of Geosciences,19(2):129—138(in Chinese).
张希,江在森,张晓亮.2002.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,22(3):40—45.ZHANG Xi,JIANG Zai-sen,ZANG Xiao-liang.2002.Aseismic negative dislocation inversion of recent horizontal crustmovement in North China[J].Journal of Geodesy and Geodynamics,22(3):40—45(in Chinese).
Rebetsky Y L.1997a.Reconstruction of tectonic stresses and seismotectonic strains:Methodical fundamentals,currentstress field of southeastern Asia and Oceania[J].Dokl Akad Nauk,354:101—104.
Rebetsky Y L.1997b.Methods for reconstructing tectonic stresses and seismotectonic deformations based on the moderntheory of plasticity[J].Dokl Akad Nauk,370—373.
Rebetsky Y L.2003.Development of the method of cataclastic analysis of shear fractures for tectonic stress estimation[J].Dokl Akad Nauk,388:72—76.
Rebetsky Y L,Marinin A V.2006a.Stress state of Earth's crust in the western region of Sunda subduction zone beforethe Sumatra-Andaman earthquake on December26,2004[J].Dokl Akad Nauk,407:812—815.
Rebetsky Y L,Marinin A V.2006b.Preseismic stress field before Sumatra-Andaman earthquake of26.12.2004:Amodel of metastable state of rocks[J].Geol i Geofiz,47:1173—1185.
Rebetsky Y L.2009a.Estimation of stress values in the method of cataclastic analysis of shear fracture[J].DokladyEarth Sciences,428(7):1202—1207.
Rebetsky Y L.2009b.Stress state of the Earth's crust of the Kurils Islands and Kamchatka before the Simushir earth-quake[J].Russ J Pacific Geol,3(5):477—490.
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