伽师强震系列应力场的转向过程
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摘要
自1997～2003年,新疆伽师地区相继发生多次强震.取哈佛大学公布的伽师强震系列CMT(矩心矩张量解)解资料,由滑动矢量拟合法反演区域应力场.CMT解的系统聚类分析表现出3个阶段的时序特征.分析震源区应力场发现,1997年3月1日至2003年1月4日期间新疆伽师地区的应力场发生变化,2003年2月24日起,又恢复到基本应力场的方向,从而完成从基本应力场-变化应力场-基本应力场一次完整变动过程.结合区域受力状况和构造背景,讨论了新疆伽师强震系列应力场变化的成因,并且认为伽师强震系列具有体破裂的特征.
The Central Moment Tensor (CMT) solutions of Jiashi strong earthquake sequence issued by Harvard University are used to inverse the regional stress field. The systematic cluster analysis of the CMT solutions shows the time_sequence features of three periods. Further analysis of the stress field for the focal region indicates that the variations took place in the period from March 1, 1997 to Jan. 4, 2003. Since Feb. 24, 2003, the direction of basic stress field was recovered. Thus a complete process from the initial variation of the basic stress field to the final recovery of the basic stress field finished. Combining the stressed conditions and tectonic background of the region, the genesis for the stress field variation of the strong earthquake sequence is discussed. We suggest that the Jiashi strong earthquake sequence has the characteristics of body fracture.
The Central Moment Tensor (CMT) solutions of Jiashi strong earthquake sequence issued by Harvard University are used to inverse the regional stress field. The systematic cluster analysis of the CMT solutions shows the time_sequence features of three periods. Further analysis of the stress field for the focal region indicates that the variations took place in the period from March 1, 1997 to Jan. 4, 2003. Since Feb. 24, 2003, the direction of basic stress field was recovered. Thus a complete process from the initial variation of the basic stress field to the final recovery of the basic stress field finished. Combining the stressed conditions and tectonic background of the region, the genesis for the stress field variation of the strong earthquake sequence is discussed. We suggest that the Jiashi strong earthquake sequence has the characteristics of body fracture.
引文
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[16]DziewonskiAM,ChouTA,WoodhouseJH.Determinationof earthquakesourceparametersfromwaveformdataforstudiesofglobal andregionalseismicity.J.Geophys.Res.,1981.86(B4):2825～2852
[17]刁桂苓,于利民,李钦祖.震源机制解的系统聚类分析:以海城地震系列为例.中国地震,1992,8(3):86～92DiaoGL,YuLM,LiQZ.Hierachicalclusteringanalysisofthe focalmechanismsolution———TakingtheHaichengearthquake sequencesforexample.EarthquakeResearchinChina(inChinese),1992,8(3):86～92
[18]AngelierJ.Determinationoftheweanprincipaldirectionsofstresses foragivenpopulation.Tectonophysics,1979,56:17～26
[19]EllsworthWL.Ageneraltheoryfordeterminingthestateofstressin theearthfromfaultslipmeasurements.TerrraCognila,1981,2(2):170～171
[20]许忠淮,戈澍谟.用滑动方向拟合法反演富蕴地震断裂带应力场.地震学报,1984,8(5):395～404XuZH,GeSM.StressfieldintheFuyun,Xinjiangearthquake fracturezonedeterminedbyfittingfaultslipvectordada.Acta SeismologicaSinica(inChinese),1984,8(5):395～404
[21]许忠淮.用滑动矢量拟合法反演唐山余震区的平均应力场.地震学报,1985,7(4):349～352XuZH.MeanstressfieldinTangshanaftershockareaobtainedfrom focalmechanismdatabyfittingslipdirections.ActaSeismologica Sinica(inChinese),1985,7(4):349～352
[22]许忠淮.东亚地区现今构造应力图的编制.地震学报,2001,23(5):249～501XuZH.Apresent_daytectonicstressmapforeasternAsiaregion.ActaSeismologicaSinica(inChinese),2001,23(5):249～501
[23]李钦祖.华北地壳应力场的基本特征.地球物理学报,1980,23(4):276～388LiQZ.GeneralfeaturesofthestressfieldinthecrustofNorth China.ChineseJ.Geophys.(inChinese),1980,23(4):276～388
[24]王凯英,马瑾,顾国华等.1996年川滇地区发生的一次应力转向事件.地学前缘,2003,10(特刊):233～239WangKY,MaJ,GuGHetal.RotationofstressaxisinSichuan_Yunnanregionin1996.EarthScienceFromtiers(inChinese),2003,10(Special):233～239
[25]刁桂苓,于利民,李钦祖.强震前后震源区应力场变化一例.地震学报,1994,16(1):64～69DiaoGL,YuLM,LiQZ.Variationofstressfieldinthesourceregionaroundastrongshock:anexample.ActaSeismologicaSinica(inChinese),1994,16(1):64～69
[26]苏乃秦.新疆伽师强震群强震主破裂面初探.西北地震学报,2003,25(3):269～274SuNQ.PreliminarystudyonstrikeofmainrupturesurfaceofJiashi strongearthquakeswarm.NorthwesternSeismologicalJournal(in Chinese),2003,25(3):269～274
[27]苏乃秦.从1997—1998年伽师强震群到2003年巴楚—伽师岳普湖震群———震群演化特征及趋势分析.内陆地震,2004,18(1):29～38SuNQ.FromtheJiashistrongswarmin1997—1998totheBachu-Jiashi_Yuepuhuearthquakesin2003———Thecharacteristicsofswarm evolutionandtheanalysisofseismictendency.InlandEarthquake(inChinese),2004,18(1):29～38
[28]李钦祖,BoltBA.1979年美国加州凯奥蒂湖地震序列震源机制分析:美国加州地震比中国大陆地震破裂过程简单的证据.地球物理学报,1992,35(2):160～173LiQZ,BoltBA.Analysisofsourcemechanismsofthe1979Coyote lakeearthquakesequence:evidenceforthattheruptureprocessof earthquakesinCaliforniaissimplerthanthatinChinesemainland.ChineseJ.Geophys.(inChinese),1992,35(2):160～173
[29]刁桂苓,于利民,宁杰远等.1989年大同震群的体破裂特征.地球物理学报,1993,36(3):360～368DiaoGL,YuLM,NingJY,etal.Thebodybreaking characteristicofDatongearthquakeswarmat1989.ChineseJ.Geophys.(inChinese),1993,36(3):360～368
[2]许忠淮,汪素云,黄雨蕊等.由大量地震资料推断我国大陆构造应力场.地球物理学报,1989,35(5):560～572XuZH,WangSY,HuangYR,etal.Thetectonicstressfiledof Chinesecontinentdeducedfromagreatnumberofearthquakes.ChineseJ.Geophys.(inChinese),1989,35(5):560～572
[3]杜兴信,邵辉成.由震源机制解反演中国大陆现代应力场.地震学报,1999,21(4):354～360DuXX,ShaoHC.ModerntectonicstressfieldintheChinese mainlandinvertedfromfocalmechanismsolutions.ActaSeismologica Sinica(inChinese),1999,21(4):354～360
[4]王盛泽,高国英.新疆及邻近地区现代构造应力场的区域特征.地震学报,1992,14(增刊):612～620WangSZ,GaoGY.Theregionalcharacteristicofrecenttectonic stressfieldinXinjiangandneighboringareas.ActaSeismologica Sinica(inChinese),1992,14(Suppl.):612～620
[5]高国英,温和平.帕米尔东北侧现代构造应力场与地震活动特征研究.中国地震,2000,16(2):176～184GaoGY,WenHP.Recenttectonicstressfieldandseismicityof NortheastPamir.EarthquakeResearchinChina(inChinese),2000,16(2):176～184
[6]高国英,王海涛,温和平等.帕米尔东北侧中强地震前应力场动态变化特征分析.西北地震学报,2001,23(4):389～394GaoGY,WangHT,WenHP,etal.Analysisonthedynamic changecharacterofthestressfieldbeforemid_strongearthquakesin NortheasternPamir.NorthwesternSeismologicalJournal(in Chinese),2001,23(4):389～394
[7]高国英,聂晓红,夏爱国.2003年伽师6.8级地震序列特征和震源机制的初步研究.中国地震,2004,20(2):179～186GaoGY,NieXH,XiaAG.Preliminarystudyoncharacteristicsof theJiashiearthquakesequencewithMS6.8anditsfocalmechanism solutionin2003.EarthquakeResearchinChina(inChinese),2004,20(2):179～186
[8]高国英,戈澍谟,韩月鹏等.1996年3月19日新疆阿图什6.9级地震震源破裂特征研究.地震,1997,17(3):290～295GaoGY,GeSM,HanYP,etal.Thecharacteristicsofrupture processofXinjiangAtushiearthquake(MS6.9),19,March1996.Earthquake(inChinese),1997,17(3):290～295
[9]高国英,温和平,聂晓红.1991～2002年新疆中强震震源机制解分析.地震,2005,待刊GaoGY,WenHP,NieXH.Analysisonfocalmechanism solutionsofmiddle_strongearthquakeinXinjiangfrom1991to2002.Earthquake(inChinese),2005,Inpress
[10]单新建,何玉梅,朱燕等.伽师强震群震源破裂特征的初步分析.地球物理学报,2002,45(2):416～425ShanXJ,HeYM,ZhuY,etal.Apreliminaryanalysisonrupture characteristicsofJiashistrongearthquakeswarm.ChineseJ.Geophys.(inChinese),2002,45(2):416～425
[11]周仕勇,许忠淮,陈晓非.伽师强震群震源特征及震源机制力学成因分析.地球物理学报,2001,44(3):654～662ZhouSY,XuZH,ChenXF.Analysisonthesourcecharacteristics ofthe1997Jaishiswarm,WesternChina.ChineseJ.Geophys.(in Chinese),2001,44(3):654～662
[12]刘瑞丰,陈运泰,周公威等.地震矩张量反演在地震快速反应中的应用.地震学报,1999,21(2):115～122LiuRF,ChenYT,ZhouGW.Applicationsofseismicmoment tensorinversioninfastresponsetoearthquake.ActaSeismologica Sinica(inChinese),1999,21(2):115～122
[13]马淑田,姚振兴,纪晨.1996年3月19日新疆伽师MS6.9级地震的震源机制以及相关问题研究.地球物理学报,1997,40(6):573～579MaST,YaoZX,JiC.ThefocalmechanismsolutionforMarch19,1996,MS6.9EarthquakeinXinjiang,Jiashiregionandrelated problems.ChineseJ.Geophys.(inChinese),1997,40(6):573～579
[14]王勤彩,薛经,刁桂苓等.伽师强震群序列的破裂特征.华北地震科学,2001,19(1):43～47WangQC,XueJ,DiaoGL,etal.Therupturecharacteristicofthe strongearthquakesequenceinJiashi.NorthChinaEarthquake Sciences(inChinese),2001,19(1):43～47
[15]杨欣,高国英.1997年伽师强震群序列特征和震源机制的初步研究.地震学报,1998,20(6):573～579YangX,GaoGY.Apreliminaryresearchonthecharacteristicsand thesourcemechanismoftheJiashistrongearthquakeswarm.Acta SeismologicaSinica(inChinese),1998,20(6):573～579
[16]DziewonskiAM,ChouTA,WoodhouseJH.Determinationof earthquakesourceparametersfromwaveformdataforstudiesofglobal andregionalseismicity.J.Geophys.Res.,1981.86(B4):2825～2852
[17]刁桂苓,于利民,李钦祖.震源机制解的系统聚类分析:以海城地震系列为例.中国地震,1992,8(3):86～92DiaoGL,YuLM,LiQZ.Hierachicalclusteringanalysisofthe focalmechanismsolution———TakingtheHaichengearthquake sequencesforexample.EarthquakeResearchinChina(inChinese),1992,8(3):86～92
[18]AngelierJ.Determinationoftheweanprincipaldirectionsofstresses foragivenpopulation.Tectonophysics,1979,56:17～26
[19]EllsworthWL.Ageneraltheoryfordeterminingthestateofstressin theearthfromfaultslipmeasurements.TerrraCognila,1981,2(2):170～171
[20]许忠淮,戈澍谟.用滑动方向拟合法反演富蕴地震断裂带应力场.地震学报,1984,8(5):395～404XuZH,GeSM.StressfieldintheFuyun,Xinjiangearthquake fracturezonedeterminedbyfittingfaultslipvectordada.Acta SeismologicaSinica(inChinese),1984,8(5):395～404
[21]许忠淮.用滑动矢量拟合法反演唐山余震区的平均应力场.地震学报,1985,7(4):349～352XuZH.MeanstressfieldinTangshanaftershockareaobtainedfrom focalmechanismdatabyfittingslipdirections.ActaSeismologica Sinica(inChinese),1985,7(4):349～352
[22]许忠淮.东亚地区现今构造应力图的编制.地震学报,2001,23(5):249～501XuZH.Apresent_daytectonicstressmapforeasternAsiaregion.ActaSeismologicaSinica(inChinese),2001,23(5):249～501
[23]李钦祖.华北地壳应力场的基本特征.地球物理学报,1980,23(4):276～388LiQZ.GeneralfeaturesofthestressfieldinthecrustofNorth China.ChineseJ.Geophys.(inChinese),1980,23(4):276～388
[24]王凯英,马瑾,顾国华等.1996年川滇地区发生的一次应力转向事件.地学前缘,2003,10(特刊):233～239WangKY,MaJ,GuGHetal.RotationofstressaxisinSichuan_Yunnanregionin1996.EarthScienceFromtiers(inChinese),2003,10(Special):233～239
[25]刁桂苓,于利民,李钦祖.强震前后震源区应力场变化一例.地震学报,1994,16(1):64～69DiaoGL,YuLM,LiQZ.Variationofstressfieldinthesourceregionaroundastrongshock:anexample.ActaSeismologicaSinica(inChinese),1994,16(1):64～69
[26]苏乃秦.新疆伽师强震群强震主破裂面初探.西北地震学报,2003,25(3):269～274SuNQ.PreliminarystudyonstrikeofmainrupturesurfaceofJiashi strongearthquakeswarm.NorthwesternSeismologicalJournal(in Chinese),2003,25(3):269～274
[27]苏乃秦.从1997—1998年伽师强震群到2003年巴楚—伽师岳普湖震群———震群演化特征及趋势分析.内陆地震,2004,18(1):29～38SuNQ.FromtheJiashistrongswarmin1997—1998totheBachu-Jiashi_Yuepuhuearthquakesin2003———Thecharacteristicsofswarm evolutionandtheanalysisofseismictendency.InlandEarthquake(inChinese),2004,18(1):29～38
[28]李钦祖,BoltBA.1979年美国加州凯奥蒂湖地震序列震源机制分析:美国加州地震比中国大陆地震破裂过程简单的证据.地球物理学报,1992,35(2):160～173LiQZ,BoltBA.Analysisofsourcemechanismsofthe1979Coyote lakeearthquakesequence:evidenceforthattheruptureprocessof earthquakesinCaliforniaissimplerthanthatinChinesemainland.ChineseJ.Geophys.(inChinese),1992,35(2):160～173
[29]刁桂苓,于利民,宁杰远等.1989年大同震群的体破裂特征.地球物理学报,1993,36(3):360～368DiaoGL,YuLM,NingJY,etal.Thebodybreaking characteristicofDatongearthquakeswarmat1989.ChineseJ.Geophys.(inChinese),1993,36(3):360～368
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