川滇地区断层相互作用的地震活动证据及有限元模拟
|
摘要
对川滇地区主要活动断裂地震活动性的分析表明 ,该区主要活动断裂间存在地震活动的相关性 :1)强震活跃期沿着鲜水河断裂、小江断裂、红河断裂、龙陵 -澜沧断裂及NE向的龙门山 -瑞丽断裂依次迁移 ;2 )鲜水河断裂与龙陵 -澜沧断裂不仅在强震活动上 ,而且在b值变化上存在较强的相关性 ,是平行断裂在区域应力场作用下相互作用的结果 ;3)龙门山 -瑞丽断裂与上述川滇地区其它近NW向断裂间存在地震交替活动的现象 ;4 )龙门山 -瑞丽断裂的地震具有分段活动的特征 ,是断块差异活动的体现。有限元分析显示 ,上述断层相互作用现象是块体非均匀运动过程中应力场调整的反映 ,是块体运动的结果。研究表明川滇地区主要断层地震活动间存在 3种相互作用的现象 ,即块体边界迁移型、旋向相反平行断层交替型和交叉断层交替型
In this paper,seismicities along the main active faults in Sichuan-Yunnan region,including the Xian-shuihe,Xiaojiang,Honghe,Longling-Lancang and Longmenshan-Ruili Faults,are analyzed.The results reveal four phenomena of fault interactions:1)the active period of strong earthquake initiates at first on the Xianshuihe Fault,and then initiates in succession on the Xiaojiang,Honghe,Longling-Lancang and Long-menshan-Ruili Faults.The migration of the initiation time of active period of strong earthquake is consistent with the movement state of Sichuan-Yunnan continent characterized by southeastward horizontal slipping as-sociated with clockwise rotation;2)the b value and the activity of strong earthquakes on the Xianshuihe Fault bear a close relation to those on the Longling-Lancang Fault.The two faults are parallel to each other and have opposite sense of slip;3)seismic activity on the NW-trending main faults in this region occurs alternately with that on the NE-trending Longmenshan-Ruili Fault;4)seismicity on the Longmenshan-Ruili Fault is characterized by segmentation,which reflects the differential movement of the fault blocks bounded by various segments of the fault. In addition,finite element method is applied to simulate the variation process of stress field caused by fault interactions in Sichuan-Yunnan region.The results show that the fault interactions mentioned above are closely related to block movement and hence to the adjustment of stress fields.In this paper,three types of fault interactions are recognized through the analysis of seismicity along the main faults in Sichuan-Yunnan region.They include the migration of seismicity along block boundaries,the alternation of seismic-ity on parallel faults with opposite slip sense,and the alternation of seismicity on intersecting faults.
In this paper,seismicities along the main active faults in Sichuan-Yunnan region,including the Xian-shuihe,Xiaojiang,Honghe,Longling-Lancang and Longmenshan-Ruili Faults,are analyzed.The results reveal four phenomena of fault interactions:1)the active period of strong earthquake initiates at first on the Xianshuihe Fault,and then initiates in succession on the Xiaojiang,Honghe,Longling-Lancang and Long-menshan-Ruili Faults.The migration of the initiation time of active period of strong earthquake is consistent with the movement state of Sichuan-Yunnan continent characterized by southeastward horizontal slipping as-sociated with clockwise rotation;2)the b value and the activity of strong earthquakes on the Xianshuihe Fault bear a close relation to those on the Longling-Lancang Fault.The two faults are parallel to each other and have opposite sense of slip;3)seismic activity on the NW-trending main faults in this region occurs alternately with that on the NE-trending Longmenshan-Ruili Fault;4)seismicity on the Longmenshan-Ruili Fault is characterized by segmentation,which reflects the differential movement of the fault blocks bounded by various segments of the fault. In addition,finite element method is applied to simulate the variation process of stress field caused by fault interactions in Sichuan-Yunnan region.The results show that the fault interactions mentioned above are closely related to block movement and hence to the adjustment of stress fields.In this paper,three types of fault interactions are recognized through the analysis of seismicity along the main faults in Sichuan-Yunnan region.They include the migration of seismicity along block boundaries,the alternation of seismic-ity on parallel faults with opposite slip sense,and the alternation of seismicity on intersecting faults.
引文
陈开平.1993.大陆构造变形三重非线性力学解析与数值模拟〔D〕:〔学位论文〕.北京:国家地震局地质研究所.CHENKai ping.1993.MechanicalAnalysisandNumericalSimulationonTriple nonlinearCharacteristicsofContinentalTectonicDeformation〔D〕.PhDthesis.InstituteofGeology,StateSeismologicalBureau,Beijing(inChinese).
陈连旺,陆远忠,郭若眉,等.2001.华北地区断层运动与三维构造应力场的演化〔J〕.地震学报,23(4):349—361.CHENLian wang,LUYuan zhong,GUORuo mei,etal.2001.Evolutionof3DtectonicstressfieldandfaultmovementinNorthChina〔J〕.ActaSeismologicaSinica,14(4):371—383.
丁国瑜.1991.活动亚板块、构造块体相对运动〔A〕.见:丁国瑜主编.中国岩石圈动力学概论.北京:地震出版社.142—153.DINGGuo yu.1991.Relativemovementofactivesub plateandtectonicblock〔A〕.In:DINGGuo yu(ed).IntroductiontoLithosphericDynamicsofChina.SeismologicalPress,Beijing.142—153(inChinese).
邓起东,张培震,冉勇康,等.2002.中国活动构造基本特征〔J〕.中国科学(D辑),32(12):1020—1030.DENGQi dong,ZHANGPei zhen,RANYong kang,etal.2002.BasiccharacteristicsofactivetectonicsofChina〔J〕.Sci encesinChina(SerD),46(4):356—372
范俊喜,马瑾,甘卫军.2003.鄂尔多斯地块运动的整体性与不同方向边界活动的交替性〔J〕.中国科学(D辑),33(增刊):119—128.FANJun xi,MAJin,GANWei jun.2003.ThemovementoftheOrdosfaultblockandthedeformationalongitsboundaries〔J〕.ScienceinChina(SerD),33(Suppl):119—128(inChinese).
傅征祥,刘桂萍,陈棋福.2001.青藏高原北缘海原、古浪、昌马大地震间相互作用的动力学分析〔J〕.地震地质,23(1):35—42.FUZheng xiang,LIUGui ping,CHENQi fu.2001.DynamicanalysisoninteractionbetweentheHaiyuanGulangChangmagreatearthquakeinthenorthboundaryoftheTibetanPlateau〔J〕.SeismologyandGeology,23(1):35—42(inChinese).
虢顺民,向宏发,徐锡伟,等.2000.滇西南龙陵-澜沧第四纪新生断裂特征和形成机制研究〔J〕.地震地质,22(3):277—284.GUOShun min,XIANGHong fa,XUXi wei,etal.2000.CharacteristicsandformationmechanismoftheLonglingLancangnewlyemergingfaultzoneinQuaternaryinthesouthwestYunnan〔J〕.SeismologyandGeology,22(3):277—284(inChinese).
皇甫岗.1999.通海地区地震活动与鲜水河断裂的呼应关系〔A〕.见:刘祖荫主编.通海地震.169—173.HUANGFUGang.1999.RelationshipsbetweenseismicitiesinTonghaiareaandinXianshuihefaultbelt〔A〕.In:LiuZu yin(ed).TonghaiEarthquake.SeismologicalPress,Beijing.169—173(inChinese).
黄纬琼,李文香,曹学锋.1994.中国大陆地震资料完整性研究之二:分区地震资料基本完整的起始年分布图像〔J〕.地震学报,16(4):423—432.
HUANGWei qiong,LIWen xiang,CAOXue feng.1994.ResearchoncompletenessofearthquakedataintheChinesemain land(Ⅱ):Theregionaldistributionofthebeginningyearsofbasicallycompleteearthquakedata〔J〕.ActaSeismologicaSinica,7(4):529—538.
黄立人,王敏.2003.中国大陆构造块体的现今活动和变形〔J〕.地震地质,25(1):23—32.HUANGLi ren,WANGMin.2003.Present dayactivityanddeformationoftectonicblocksinChina’scontinent〔J〕.Seismolo gyandGeology,25(1):23—32(inChinese).
蒋乐群,秦嘉政,刘祖荫,等.1996.滇西实验场松桂地区S波分裂的研究〔A〕.见:刘祖荫主编.滇西地震预报实验研究论文集.北京:地震出版社.90—98.JIANGLe qun,QINJia zheng,LIUZu yin,etal.1996.ResearchesonS wavesplittingatSongguiareainWYEPSA〔A〕.In:LIUZu yin(ed).CollectionofResearchPapersonExperimentalEarthquakePredictioninWesternYunnan,China.Seis mologicalPress,Beijing.90—98(inChinese)
.阚荣举,张四昌,晏风桐,等.1977.我国西南地区现代构造应力场与现代构造活动特征的探讨〔J〕.地球物理学报,20(2):96—109.KANRong ju,ZHANGSi chang,YANFeng tong,etal.1977.StudyonthecurrenttectonicstressfieldandthecharacteristicsofcurrenttectonicactivityinsouthwestChina〔J〕.ChineseJournalofGeophysics,20(2):96—109(inChinese).
阚荣举,王绍晋,黄昆,等.1983.中国西南地区现代构造应力场与板内断块相对运动〔J〕.地震地质,5(2):79—90.KANRong ju,WANGShao jin,HUANGKun,etal.1983.ModernstressfieldandrelativemotionofintraplateblockinsouthwestChina〔J〕.SeismologyandGeology,5(2):79—90(inChinese).
李,汪良谋.1975.云南川西地区地震地质基本特征的探讨〔J〕.地质科学,4:308—325.LIPing,WANGLiang mou.1975.ResearchonbasicseismologicalcharacteristicsofYunnanandwesternSichuanregion〔J〕.ScientiaGeologicaSinica,4:308—325(inChinese).
马瑾.1999.从断层中心论向块体中心论转变〔J〕.地学前缘,6(4):363—370.MAJin.1999.Changingviewpointfromfaulttoblo
陈连旺,陆远忠,郭若眉,等.2001.华北地区断层运动与三维构造应力场的演化〔J〕.地震学报,23(4):349—361.CHENLian wang,LUYuan zhong,GUORuo mei,etal.2001.Evolutionof3DtectonicstressfieldandfaultmovementinNorthChina〔J〕.ActaSeismologicaSinica,14(4):371—383.
丁国瑜.1991.活动亚板块、构造块体相对运动〔A〕.见:丁国瑜主编.中国岩石圈动力学概论.北京:地震出版社.142—153.DINGGuo yu.1991.Relativemovementofactivesub plateandtectonicblock〔A〕.In:DINGGuo yu(ed).IntroductiontoLithosphericDynamicsofChina.SeismologicalPress,Beijing.142—153(inChinese).
邓起东,张培震,冉勇康,等.2002.中国活动构造基本特征〔J〕.中国科学(D辑),32(12):1020—1030.DENGQi dong,ZHANGPei zhen,RANYong kang,etal.2002.BasiccharacteristicsofactivetectonicsofChina〔J〕.Sci encesinChina(SerD),46(4):356—372
范俊喜,马瑾,甘卫军.2003.鄂尔多斯地块运动的整体性与不同方向边界活动的交替性〔J〕.中国科学(D辑),33(增刊):119—128.FANJun xi,MAJin,GANWei jun.2003.ThemovementoftheOrdosfaultblockandthedeformationalongitsboundaries〔J〕.ScienceinChina(SerD),33(Suppl):119—128(inChinese).
傅征祥,刘桂萍,陈棋福.2001.青藏高原北缘海原、古浪、昌马大地震间相互作用的动力学分析〔J〕.地震地质,23(1):35—42.FUZheng xiang,LIUGui ping,CHENQi fu.2001.DynamicanalysisoninteractionbetweentheHaiyuanGulangChangmagreatearthquakeinthenorthboundaryoftheTibetanPlateau〔J〕.SeismologyandGeology,23(1):35—42(inChinese).
虢顺民,向宏发,徐锡伟,等.2000.滇西南龙陵-澜沧第四纪新生断裂特征和形成机制研究〔J〕.地震地质,22(3):277—284.GUOShun min,XIANGHong fa,XUXi wei,etal.2000.CharacteristicsandformationmechanismoftheLonglingLancangnewlyemergingfaultzoneinQuaternaryinthesouthwestYunnan〔J〕.SeismologyandGeology,22(3):277—284(inChinese).
皇甫岗.1999.通海地区地震活动与鲜水河断裂的呼应关系〔A〕.见:刘祖荫主编.通海地震.169—173.HUANGFUGang.1999.RelationshipsbetweenseismicitiesinTonghaiareaandinXianshuihefaultbelt〔A〕.In:LiuZu yin(ed).TonghaiEarthquake.SeismologicalPress,Beijing.169—173(inChinese).
黄纬琼,李文香,曹学锋.1994.中国大陆地震资料完整性研究之二:分区地震资料基本完整的起始年分布图像〔J〕.地震学报,16(4):423—432.
HUANGWei qiong,LIWen xiang,CAOXue feng.1994.ResearchoncompletenessofearthquakedataintheChinesemain land(Ⅱ):Theregionaldistributionofthebeginningyearsofbasicallycompleteearthquakedata〔J〕.ActaSeismologicaSinica,7(4):529—538.
黄立人,王敏.2003.中国大陆构造块体的现今活动和变形〔J〕.地震地质,25(1):23—32.HUANGLi ren,WANGMin.2003.Present dayactivityanddeformationoftectonicblocksinChina’scontinent〔J〕.Seismolo gyandGeology,25(1):23—32(inChinese).
蒋乐群,秦嘉政,刘祖荫,等.1996.滇西实验场松桂地区S波分裂的研究〔A〕.见:刘祖荫主编.滇西地震预报实验研究论文集.北京:地震出版社.90—98.JIANGLe qun,QINJia zheng,LIUZu yin,etal.1996.ResearchesonS wavesplittingatSongguiareainWYEPSA〔A〕.In:LIUZu yin(ed).CollectionofResearchPapersonExperimentalEarthquakePredictioninWesternYunnan,China.Seis mologicalPress,Beijing.90—98(inChinese)
.阚荣举,张四昌,晏风桐,等.1977.我国西南地区现代构造应力场与现代构造活动特征的探讨〔J〕.地球物理学报,20(2):96—109.KANRong ju,ZHANGSi chang,YANFeng tong,etal.1977.StudyonthecurrenttectonicstressfieldandthecharacteristicsofcurrenttectonicactivityinsouthwestChina〔J〕.ChineseJournalofGeophysics,20(2):96—109(inChinese).
阚荣举,王绍晋,黄昆,等.1983.中国西南地区现代构造应力场与板内断块相对运动〔J〕.地震地质,5(2):79—90.KANRong ju,WANGShao jin,HUANGKun,etal.1983.ModernstressfieldandrelativemotionofintraplateblockinsouthwestChina〔J〕.SeismologyandGeology,5(2):79—90(inChinese).
李,汪良谋.1975.云南川西地区地震地质基本特征的探讨〔J〕.地质科学,4:308—325.LIPing,WANGLiang mou.1975.ResearchonbasicseismologicalcharacteristicsofYunnanandwesternSichuanregion〔J〕.ScientiaGeologicaSinica,4:308—325(inChinese).
马瑾.1999.从断层中心论向块体中心论转变〔J〕.地学前缘,6(4):363—370.MAJin.1999.Changingviewpointfromfaulttoblo
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心