郯庐断裂带安徽段现代地震活动及应力场特征
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摘要
分析了郯庐断裂带安徽段地震活动特征,利用近震直达波最大振幅比方法反演了99次中-小地震震源机制,并作了统计和聚类分析。现代地震活动整体上继承了历史地震分布格局,未显示增强趋势;断裂带及邻区应力场P轴和T轴优势方位大致呈近东西向和近南北向分布,现今承受的作用力以近水平或斜向为主,但也存在部分其它方向的应力场和近垂直方向的作用力。震源断层的破裂类型,带内以逆冲(或正断),或近逆冲(或正断)型为主。带附近较明显地呈现出走滑型或近走滑型破裂的优势;北、南亚段应力场有明显差异,即北压南张,其分界大约在北纬32°附近,北西西走向的桥头集—东关断裂是两者间的构造变换带。
The characteristics of recent earthquake activity in Anhui sector of the Tan-Lu fault zone was analyzed in this paper. Based on data of 99 moderate-small earthquakes along the fault, the focus mechanism was inversed by the method of maximum amplitude ratio of the first arrival wave in the Anhui local seismic network. According to these results and using statistics and focus mechanism systematic cluster analysis method,the characteristics of tectonic stress field and the focus fault rupture were quantitatively analyzed along the fault and its neighboring areas. The results showed that the recent earthquake activities in Anhui sector of the Tan-Lu fault zone inherited the historical seismic features in the space distribution, and the intensity of recent earthquakes did not show buildup trend. The superior azimuth of P axis and T axis in both the whole fault zone and the adjacent Anhui sector were about EW and NS, which meant that the effective recent force might be mainly near level or inclined, but there were other directional stress fields and near uprightness force. The focal fault rupture type was dip-slip or near dip-slip along the fault, and the type in the areas adjacent the fault was strike-slip or near strike-slip. There was a different character of stress fields in the northern and southern sub-sectors, namely, compression in the north and extension in the south. The dividing line is located at about 32° north latitude, with the NWW-striking Qiaotouji-Guandong fault being a structural transfer belt.
The characteristics of recent earthquake activity in Anhui sector of the Tan-Lu fault zone was analyzed in this paper. Based on data of 99 moderate-small earthquakes along the fault, the focus mechanism was inversed by the method of maximum amplitude ratio of the first arrival wave in the Anhui local seismic network. According to these results and using statistics and focus mechanism systematic cluster analysis method,the characteristics of tectonic stress field and the focus fault rupture were quantitatively analyzed along the fault and its neighboring areas. The results showed that the recent earthquake activities in Anhui sector of the Tan-Lu fault zone inherited the historical seismic features in the space distribution, and the intensity of recent earthquakes did not show buildup trend. The superior azimuth of P axis and T axis in both the whole fault zone and the adjacent Anhui sector were about EW and NS, which meant that the effective recent force might be mainly near level or inclined, but there were other directional stress fields and near uprightness force. The focal fault rupture type was dip-slip or near dip-slip along the fault, and the type in the areas adjacent the fault was strike-slip or near strike-slip. There was a different character of stress fields in the northern and southern sub-sectors, namely, compression in the north and extension in the south. The dividing line is located at about 32° north latitude, with the NWW-striking Qiaotouji-Guandong fault being a structural transfer belt.
引文
薄万举,杨国华,谢觉民,郭良迁,王若柏,华彩虹.1996.郯庐断裂带地壳活动新特征.东北地震研究,12(4):1—10.BoWangju,YangGuohua,XieJuemin,GuoLiangqian,WangRuobaiandHuaCaihong.1996.NewfeatureofcrustalactivityofTan-Lufaultzone.SeismologicalResearchofNortheastChina,12(4):1—10.
程万正,刁桂苓,吕弋培,张永久,李桂芳,陈天长.2003.川滇地块的震源力学机制、运动速率和活动方式.地震地质,25(1):71—87.ChengWanzheng,DiaoGuiling,LYipei,ZhangYongjiu,LiGuifangandChenTianchang.2003.Focalmechanisms,move-mentrateandmodeofmotionoftheSichuan—YunnanBlock.SeismologyandGeology,25(1):71—87.
刁桂苓,于利民,李钦祖.1992.震源机制解的系统聚类分析.中国地震,8(3):86—92.DiaoGuiling,YuLiminandLiQinzu.1992.Systemclusteringanalysisofthefocalmechanism.EarthquakeResearchinChi-na,8(3):86—92.
国家地震局震害防御司.1995.中国历史强震目录(公元前23世纪至1911年).北京:地震出版社.1—514.DepartmentofEarthquakeDisasterPrevention,SeismologicalBureauofChina.1995.StrongHistoricalEarthquakeCatalogueofChina(B.C.23century~A.D.1911).Beijing:SeismologicalPress.1—514.
胡新亮,刁桂苓,马瑾,李)英,高景春,王勤彩.2004.利用数字地震记录的—P,—S振幅比资料测定小震震源机制解的可靠性分析.地震地质,26(2):347—354.HuXinliang,DiaoGuiling,MaJin,LiXueying,GaoJingchunandWangQincai.2004.Reliabilityanalysisoffocalmecha-nismsolutionsofmicro-earthquakesdeterminedfromamplituderatioof—Pand—Srecordedbydigitalseismograph.Seis-mologyandGeology,26(2):347—354.
李开善.1987.郯庐断裂带构造应力场初步探讨.中国地质科学院562综合大队集刊,(6):127—137.LiKaishan.1987.ApreliminaryexplorationonthetectonicstressfieldofTan-Lufaultzone.Bulletinofthe562ComprehensiveGeologicalBrigade,ChineseAcademyofGeologicalSciences,(6):127—137.
李钦祖.1980.华北地壳应力场的基本特征.地球物理学报,23(4):376—388.LiQinzu.1980.ThebasiccharacteristicsofthelithospherestressfieldofNorthChina.ChineseJour.Geophys.,23(4):376—388.
梁兴,吴根耀.2006.赣江断裂带中生代的演化及其地球动力学背景.地质科学,41(1):64—80.LiangXingandWuGenyao.2006.MesozoicevolutionoftheGanjiangfaultzoneandrelatedgeodynamicsettings.ChineseJour.Geol.,41(1):64—80.
梁尚鸿,李幼铭,束沛镒,朱碚定.1984.利用区域地震台网—P、—S波振幅比资料测定小震震源参数.地球物理学报,27(3):249—257.LiangShanghong,LiYouming,ShuPeiyiandZhuBeiding.1984.Determinedthefocalmechanismsolutionofmicro-earth-quakesfromamplituderatioof—Pand—Srecordedbyareaseismologicalnetwork.ChineseJour.Geophys.,27(3):249—257.
马瑾.1999.从断层中心论向块体中心论转变———论活动地块体在地震活动中的作用.地学前缘,6(4):363—370.MaJin.1999.Changingviewpointfromfaulttoblock—Adiscussionabouttheroleofactiveblockinseismicity.EarthScienceFrontiers,6(4):363—370.
牛漫兰,朱光,刘国生,宋传中,王道轩.2005.郯庐断裂带中-南段新生代火山活动与深部过程.地质科学,40(3):390—403.NiuManlan,ZhuGuang,LiuGuosheng,SongChuanzhongandWangDaoxuan.2005.Cenozoicvolcanicactivitiesanddeepprocessesinthemiddle-southsectoroftheTan-Lufaultzone.ChineseJour.Geol.,40(3):390—403.
汤有标,姚大全.1990a.郯庐断裂带赤山段晚更新世以来的活动性.中国地震,6(2):63—69.TangYoubiaoandYaoDaquan.1990a.PostlatePleistoceneactivityofChishansegmentoftheTan-Lufaultzone.EarthquakeResearchinChina,6(2):63—69.
汤有标,姚大全.1990b.郯庐断裂带南段新活动性的初步研究.地震研究,13(2):155—165.TangYoubiaoandYaoDaquan.1990b.PreliminarystudiesonnewactivityofthesouthernpartoftheTan-Lufaultzone.Jour-nalofSeismologicalResearch,13(2):155—165.
万天丰.1992.山东省构造演化与应力场研究.山东地质,8(2):70—101.WanTianfeng.1992.TectonicevolutionandstressfieldsinShandongProvince.GeologyofShandong,8(2):70—101.
王若柏.1988.苏鲁皖地区现代构造活动研究.地震地质,10(1):1—7.WangRuobai.1988.ModernstructureactivityresearchinJiangsu,ShandongandAnhuiarea.SeismologyandGeology,10(1):1—7.
魏光兴,刁守中,周翠英.1993.郯庐带地震活动性研究.北京:地震出版社.110—166.WeiGuanxing,DiaoShouzhongandZhouCuiying.1993.TheResearchofEarthquakeActivityofTan-LuFaults.Beijing:SeismologicalPress.110—166.
吴根耀.1997.湘鄂赣皖交界区的湖盆演化及其控制因素.大地构造与成矿学,21(3):251—261.WuGenyao.1997.LakesborderingHunan,Hubei,JiangxiandAnhuiprovinces:basindevelopmentandcontrolfactors.GeotectonicaetMetallogenia,21(3):251—261.
邬光辉,郑多明.2004.塔里木北部地区北北西向构造变换带特征及对石油勘探的启示.地质科学,39(4):551—560.WuGuanghuiandZhengDuoming.2004.FeaturesofNNW-strikingstructuraltransferzoneinNorthTarimanditsinspirationforoilexploration.ChineseJour.Geol.,39(4):551—560.
夏瑞良,刘东旺.1995.郯庐断裂带南段的地震活动及应力场特征.福建地震,11(4):13—19.XiaRuiliangandLiuDongwang.1995.ThecharacteristicsoftheearthquakeactivityandstressfieldinsouthTanlufaults.Fu-jianEarthquake,11(4):13—19.
许忠淮,阎明,赵忠和.1983.由多个小地震推断的华北地区构造应力场的方向.地震学报,5(3):268—279.XuZhonghuai,YanMingandZhaoZhonghe.1983.Determinedthedirectionofthestructurestressfieldfrommicro-earth-quakeinNorthChina.ActaSeismologicaSinica,5(3):268—279.
虞廷林.1994.中国东部应力场与板块运动.地震学刊,14(2):13—17.YuTinglin.1994.StressfieldandplatemotionsineasternareaofChina.JournalofSeismology,14(2):13—17.
中国地震局震害防御司.1999.中国近代地震目录(公元1912~1990年).北京:中国科学技术出版社.1—637.DepartmentofEarthquakeDisasterandPrevention,SeismologicalBureauofChina.1999.ModernTimesEarthquakeCatalogueofChina(A.D.1912—1990).Beijing:ChinaScienceandTechnologyPress.1—637.
周翠英,魏光兴.1987.沂沭断裂带现代构造应力场与地震活动.华北地震科学,5(2):29—39.ZhouCuiyingandWeiGuanxing.1987.ThemodernstructurestressfieldandearthquakeactivityinYi-Shufaults.NorthChi-naEarthquakeSciences,5(2):29—39.
朱光,刘国生,牛漫兰,宋传中,王道轩.2002.郯庐断裂带晚第三纪以来的浅部挤压活动与深部过程.地震地质,24(2):265—277.ZhuGuang,LiuGuosheng,NiuManlan,SongChuanzhongandWangDaoxuan.2002.Post-EogenecompressiveactivitiesontheTan-Lufaultzoneandtheirdeepprocesses.SeismologyandGeology,24(2):265—277.
朱光,王道轩,刘国生,牛漫兰,宋传中.2004.郯庐断裂带的演化及其对西太平洋板块运动的响应.地质科学,39(1):36—49.ZhuGuang,WangDaoxuan,LiuGuosheng,NiuManlanandSongChuanzhong.2004.EvolutionoftheTan-LufaultzoneanditsresponsestoplatemovementsinWestPacificBasin.ChineseJour.Geol.,39(1):36—49.
ShenZK,ZhaoCandYinA.2000.ContemporarycrustaldeformationineastAsiaconstrainedbyGlobalPositioningSystemmeasurements.Jour.Geophys.Res.,105(B3):5721—5734.
XuJWandZhuG.1994.TectonicmodelsoftheTan-Lufaultzone,easternChina.InternationalGeol.Rev.,36:771—784.
YuTinglin,CaoXinju,WangQiliang,KuangRenjieandZhaoCheng.1989.StudyontherecentcrustaldeformationandmobilityintheTan-Lufaultzone.EarthquakeResearchinChina,3(2):22—30.
程万正,刁桂苓,吕弋培,张永久,李桂芳,陈天长.2003.川滇地块的震源力学机制、运动速率和活动方式.地震地质,25(1):71—87.ChengWanzheng,DiaoGuiling,LYipei,ZhangYongjiu,LiGuifangandChenTianchang.2003.Focalmechanisms,move-mentrateandmodeofmotionoftheSichuan—YunnanBlock.SeismologyandGeology,25(1):71—87.
刁桂苓,于利民,李钦祖.1992.震源机制解的系统聚类分析.中国地震,8(3):86—92.DiaoGuiling,YuLiminandLiQinzu.1992.Systemclusteringanalysisofthefocalmechanism.EarthquakeResearchinChi-na,8(3):86—92.
国家地震局震害防御司.1995.中国历史强震目录(公元前23世纪至1911年).北京:地震出版社.1—514.DepartmentofEarthquakeDisasterPrevention,SeismologicalBureauofChina.1995.StrongHistoricalEarthquakeCatalogueofChina(B.C.23century~A.D.1911).Beijing:SeismologicalPress.1—514.
胡新亮,刁桂苓,马瑾,李)英,高景春,王勤彩.2004.利用数字地震记录的—P,—S振幅比资料测定小震震源机制解的可靠性分析.地震地质,26(2):347—354.HuXinliang,DiaoGuiling,MaJin,LiXueying,GaoJingchunandWangQincai.2004.Reliabilityanalysisoffocalmecha-nismsolutionsofmicro-earthquakesdeterminedfromamplituderatioof—Pand—Srecordedbydigitalseismograph.Seis-mologyandGeology,26(2):347—354.
李开善.1987.郯庐断裂带构造应力场初步探讨.中国地质科学院562综合大队集刊,(6):127—137.LiKaishan.1987.ApreliminaryexplorationonthetectonicstressfieldofTan-Lufaultzone.Bulletinofthe562ComprehensiveGeologicalBrigade,ChineseAcademyofGeologicalSciences,(6):127—137.
李钦祖.1980.华北地壳应力场的基本特征.地球物理学报,23(4):376—388.LiQinzu.1980.ThebasiccharacteristicsofthelithospherestressfieldofNorthChina.ChineseJour.Geophys.,23(4):376—388.
梁兴,吴根耀.2006.赣江断裂带中生代的演化及其地球动力学背景.地质科学,41(1):64—80.LiangXingandWuGenyao.2006.MesozoicevolutionoftheGanjiangfaultzoneandrelatedgeodynamicsettings.ChineseJour.Geol.,41(1):64—80.
梁尚鸿,李幼铭,束沛镒,朱碚定.1984.利用区域地震台网—P、—S波振幅比资料测定小震震源参数.地球物理学报,27(3):249—257.LiangShanghong,LiYouming,ShuPeiyiandZhuBeiding.1984.Determinedthefocalmechanismsolutionofmicro-earth-quakesfromamplituderatioof—Pand—Srecordedbyareaseismologicalnetwork.ChineseJour.Geophys.,27(3):249—257.
马瑾.1999.从断层中心论向块体中心论转变———论活动地块体在地震活动中的作用.地学前缘,6(4):363—370.MaJin.1999.Changingviewpointfromfaulttoblock—Adiscussionabouttheroleofactiveblockinseismicity.EarthScienceFrontiers,6(4):363—370.
牛漫兰,朱光,刘国生,宋传中,王道轩.2005.郯庐断裂带中-南段新生代火山活动与深部过程.地质科学,40(3):390—403.NiuManlan,ZhuGuang,LiuGuosheng,SongChuanzhongandWangDaoxuan.2005.Cenozoicvolcanicactivitiesanddeepprocessesinthemiddle-southsectoroftheTan-Lufaultzone.ChineseJour.Geol.,40(3):390—403.
汤有标,姚大全.1990a.郯庐断裂带赤山段晚更新世以来的活动性.中国地震,6(2):63—69.TangYoubiaoandYaoDaquan.1990a.PostlatePleistoceneactivityofChishansegmentoftheTan-Lufaultzone.EarthquakeResearchinChina,6(2):63—69.
汤有标,姚大全.1990b.郯庐断裂带南段新活动性的初步研究.地震研究,13(2):155—165.TangYoubiaoandYaoDaquan.1990b.PreliminarystudiesonnewactivityofthesouthernpartoftheTan-Lufaultzone.Jour-nalofSeismologicalResearch,13(2):155—165.
万天丰.1992.山东省构造演化与应力场研究.山东地质,8(2):70—101.WanTianfeng.1992.TectonicevolutionandstressfieldsinShandongProvince.GeologyofShandong,8(2):70—101.
王若柏.1988.苏鲁皖地区现代构造活动研究.地震地质,10(1):1—7.WangRuobai.1988.ModernstructureactivityresearchinJiangsu,ShandongandAnhuiarea.SeismologyandGeology,10(1):1—7.
魏光兴,刁守中,周翠英.1993.郯庐带地震活动性研究.北京:地震出版社.110—166.WeiGuanxing,DiaoShouzhongandZhouCuiying.1993.TheResearchofEarthquakeActivityofTan-LuFaults.Beijing:SeismologicalPress.110—166.
吴根耀.1997.湘鄂赣皖交界区的湖盆演化及其控制因素.大地构造与成矿学,21(3):251—261.WuGenyao.1997.LakesborderingHunan,Hubei,JiangxiandAnhuiprovinces:basindevelopmentandcontrolfactors.GeotectonicaetMetallogenia,21(3):251—261.
邬光辉,郑多明.2004.塔里木北部地区北北西向构造变换带特征及对石油勘探的启示.地质科学,39(4):551—560.WuGuanghuiandZhengDuoming.2004.FeaturesofNNW-strikingstructuraltransferzoneinNorthTarimanditsinspirationforoilexploration.ChineseJour.Geol.,39(4):551—560.
夏瑞良,刘东旺.1995.郯庐断裂带南段的地震活动及应力场特征.福建地震,11(4):13—19.XiaRuiliangandLiuDongwang.1995.ThecharacteristicsoftheearthquakeactivityandstressfieldinsouthTanlufaults.Fu-jianEarthquake,11(4):13—19.
许忠淮,阎明,赵忠和.1983.由多个小地震推断的华北地区构造应力场的方向.地震学报,5(3):268—279.XuZhonghuai,YanMingandZhaoZhonghe.1983.Determinedthedirectionofthestructurestressfieldfrommicro-earth-quakeinNorthChina.ActaSeismologicaSinica,5(3):268—279.
虞廷林.1994.中国东部应力场与板块运动.地震学刊,14(2):13—17.YuTinglin.1994.StressfieldandplatemotionsineasternareaofChina.JournalofSeismology,14(2):13—17.
中国地震局震害防御司.1999.中国近代地震目录(公元1912~1990年).北京:中国科学技术出版社.1—637.DepartmentofEarthquakeDisasterandPrevention,SeismologicalBureauofChina.1999.ModernTimesEarthquakeCatalogueofChina(A.D.1912—1990).Beijing:ChinaScienceandTechnologyPress.1—637.
周翠英,魏光兴.1987.沂沭断裂带现代构造应力场与地震活动.华北地震科学,5(2):29—39.ZhouCuiyingandWeiGuanxing.1987.ThemodernstructurestressfieldandearthquakeactivityinYi-Shufaults.NorthChi-naEarthquakeSciences,5(2):29—39.
朱光,刘国生,牛漫兰,宋传中,王道轩.2002.郯庐断裂带晚第三纪以来的浅部挤压活动与深部过程.地震地质,24(2):265—277.ZhuGuang,LiuGuosheng,NiuManlan,SongChuanzhongandWangDaoxuan.2002.Post-EogenecompressiveactivitiesontheTan-Lufaultzoneandtheirdeepprocesses.SeismologyandGeology,24(2):265—277.
朱光,王道轩,刘国生,牛漫兰,宋传中.2004.郯庐断裂带的演化及其对西太平洋板块运动的响应.地质科学,39(1):36—49.ZhuGuang,WangDaoxuan,LiuGuosheng,NiuManlanandSongChuanzhong.2004.EvolutionoftheTan-LufaultzoneanditsresponsestoplatemovementsinWestPacificBasin.ChineseJour.Geol.,39(1):36—49.
ShenZK,ZhaoCandYinA.2000.ContemporarycrustaldeformationineastAsiaconstrainedbyGlobalPositioningSystemmeasurements.Jour.Geophys.Res.,105(B3):5721—5734.
XuJWandZhuG.1994.TectonicmodelsoftheTan-Lufaultzone,easternChina.InternationalGeol.Rev.,36:771—784.
YuTinglin,CaoXinju,WangQiliang,KuangRenjieandZhaoCheng.1989.StudyontherecentcrustaldeformationandmobilityintheTan-Lufaultzone.EarthquakeResearchinChina,3(2):22—30.
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