2003年2月24日新疆巴楚—伽师M_S6.8地震的静态库仑应力触发作用
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摘要
2003年2月24日新疆巴楚—伽师发生MS6.8地震,截止2004年6月30日发生了7次MW5以上的中强余震,序列的余震丰富、强度大.本文求算了MS6.8主震及其序列中主震和中强余震共同在后续中强余震(7次MW5.0以上余震)破裂面上产生的静态库仑破裂应力变化情况.考虑到震中定位的误差,分几种情况分别讨论了此次MS6.8主震及其中强余震产生的库仑破裂应力变化情况,并定量分析了MS6.8地震序列静态库仑破裂应力变化与断层类型的关系及其静态应力触发模型作用的延迟时间和空间范围.认为采用哈佛大学矩心矩张量目录的震源机制解、矩心深度和新疆震中定位结果较合理,由此得到的7次中强余震均发生在库仑破裂应力增加的区域.综合分析表明,巴楚—伽师MS6.8主震对后续中强余震具有一定的触发作用,而中强余震之间的触发作用不显著.但由于目前震源定位精度的限制,不能肯定序列中7次中强余震是完全受MS6.8主震触发而发生的.
An arthquake of M_S 6.8 occurred in Bachu-Jiashi county,Xinjiang,on Feb.24,2003.There were 7 strong aftershocks greater than M_W 5 till June 30th,2004,and aftershocks of the sequence were richer and stronger.The article calculates the change of static stress of M_S 6.8 mainshock,both mainshocks and aftershocks on the rupture surface of sequent mid-strong aftershocks.Considering epicenter location error,the article discusses the change of static stress of M_S 6.8 mainshock,both mainshock and mid-strong aftershocks in different aspects,and analyses quantitatively the relation between static stress change of M_S 6.8 sequence and fault type,and delay time and spatial range effected by the static triggering model.It is reasonable to employ the focal mechanism solution and depth in Harvard CMT catalogue and Xinjiang results of the location epicenter,and 7 mid-strong aftershocks occured all in the increasing region of coulomb fracture stress,which passes signal test.A general analysis shows that Bachu-Jiashi earthquake of M_S 6.8 triggered sequent mid-strong aftershocks in certain degrees,but triggering between mid-strong aftershocks is not remarkable.With the limitation of present source location precision,we are not sure that 7 events were completely triggered by M_S6.8 mainshock.
An arthquake of M_S 6.8 occurred in Bachu-Jiashi county,Xinjiang,on Feb.24,2003.There were 7 strong aftershocks greater than M_W 5 till June 30th,2004,and aftershocks of the sequence were richer and stronger.The article calculates the change of static stress of M_S 6.8 mainshock,both mainshocks and aftershocks on the rupture surface of sequent mid-strong aftershocks.Considering epicenter location error,the article discusses the change of static stress of M_S 6.8 mainshock,both mainshock and mid-strong aftershocks in different aspects,and analyses quantitatively the relation between static stress change of M_S 6.8 sequence and fault type,and delay time and spatial range effected by the static triggering model.It is reasonable to employ the focal mechanism solution and depth in Harvard CMT catalogue and Xinjiang results of the location epicenter,and 7 mid-strong aftershocks occured all in the increasing region of coulomb fracture stress,which passes signal test.A general analysis shows that Bachu-Jiashi earthquake of M_S 6.8 triggered sequent mid-strong aftershocks in certain degrees,but triggering between mid-strong aftershocks is not remarkable.With the limitation of present source location precision,we are not sure that 7 events were completely triggered by M_S6.8 mainshock.
引文
[1]Wan YG,Wu ZL,Zhou GW,et al.Research on earthquake stress triggering.Acta Seismologica Sinica,2002,24(5):533~551(in Chinesewith English abstract)
[2]Shi YL.Thinking on the application of stress triggering and stress shadow in earthquake prediction.Earthquake,21(3):1~7(in Chinese withEnglish abstract)
[3]Troise C,DeNatale G,Pingue F,et al.Evidence for static stress interaction among earthquakes in south-central Apennines(Italy).Geophys JInt,1998,134:809~817
[4]Seeber L,Armbruster JG.Earthquakes as beacons of stress change.Nature,2000,407:69~72
[5]Wang WH.Static stress transfer and aftershock triggering by 1999 Chi-Chi earthquake in Taiwan.Terrestrial Atmospheric and Oceanic Sciences,2000,11:631~642
[6]Liu GP,Fu ZX.Coulomb stress triggering of maximal aftershock(MS=6.3)of 1973 big Luhuo earthquake(MS=7.6).Earthquake Research inChina,2002,18(2):175~182(in Chinese with English abstract)
[7]Wan YG,Wu ZL,Zhou GW,et al.Global test of static stress triggering model.Acta Seismologica Sinica,2002,24(3):302~316(in Chinesewith English abstract)
[8]Hao P,Fu ZX,Tian QJ,et al.Stress triggering of stronger aftershocks of Yaoan earthquake ofMS6.5,Jan.15,2000.Earthquake Research,2004,27(3):246~251(in Chinese with English abstract)
[9]Pollitz FF.Stress triggering of the 1999 Hector Mine earthquake by transient deformation following the 1992 Landers earthquak.Bull.Seismol.Soc.Am.2002,92:1487~1496
[10]Gao GY,Nie XH,Xia AG.Initial research on earthquake sequence and focal mechanism of Jiashi earthquake ofMS6.8,in 2003.EarthquakeResearch in China,2004,20(2):179~168(in Chinese with English abstract)
[11]Zhao CP,Xia AG.Initial research on earthquake sequence and focal mechanism of Bachu-Jiashi earthquake ofMS6.8,Xinjiang.InlandEarthquake,2003,17(2):182~189(in Chinese with English abstract)
[12]Wan YG,Zhou GW,Wu ZL,et al.Comparison of focus mechanism solutions of China earthquakes.Seismollgical and Geomagnetic Observationand Research.2001,22(5):1~15(in Chinese with English abstract)
[13]Statistic group of mathematic institution of the Chinese Academy of Sciences.Common Statistic Method of Mathematics and Physics.Beijing:Science Press,1979.26~28
[14]Harris RA,Simpson RW,Reasenberg PA.Influence of static stress changes on earthquake locations in southern California.Nature,1995,375:221~224
[15]Stein RS,Barka AA,Dieterich JH.Progressive failure on the North Anatolian fault since 1939 by earthquake stress triggering.Geophys J Int,1997,128:594~604
[1]万永革,吴忠良,周公威,等.地震应力触发研究.地震学报,2002,24(5):533~551
[2]石耀霖.关于应力触发和应力影概念在地震预报中应用的一些思考.地震,2001,21(3):1~7
[6]刘桂萍,傅征祥.1973年炉霍大地震(MS=7.6)最大余震(MS=6.3)的库仑应力触发.中国地震,2002,18(2):175~182
[7]万永革,吴忠良,周公威,等.地震静态应力触发模型的全球检验.地震学报,2002,24(3):302~316
[8]郝平,田勤俭,傅征祥,等.2000年1月15日姚安6.5级地震较强余震的应力触发.地震研究,2004,27(3):246~251
[10]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):179~168
[11]赵翠萍,夏爱国.新疆巴楚—伽师6.8级地震序列震源特征的初步研究.内陆地震,2003,17(2):182~189
[12]万永革,周公威,吴忠良,等.中国地震震源机制测定结果的比较.地震地磁观测与研究,2001,22(5):1~15
[13]中国科学院数学研究所统计组编.常用数理统计方法.北京:科学出版社,1979.26~28
[2]Shi YL.Thinking on the application of stress triggering and stress shadow in earthquake prediction.Earthquake,21(3):1~7(in Chinese withEnglish abstract)
[3]Troise C,DeNatale G,Pingue F,et al.Evidence for static stress interaction among earthquakes in south-central Apennines(Italy).Geophys JInt,1998,134:809~817
[4]Seeber L,Armbruster JG.Earthquakes as beacons of stress change.Nature,2000,407:69~72
[5]Wang WH.Static stress transfer and aftershock triggering by 1999 Chi-Chi earthquake in Taiwan.Terrestrial Atmospheric and Oceanic Sciences,2000,11:631~642
[6]Liu GP,Fu ZX.Coulomb stress triggering of maximal aftershock(MS=6.3)of 1973 big Luhuo earthquake(MS=7.6).Earthquake Research inChina,2002,18(2):175~182(in Chinese with English abstract)
[7]Wan YG,Wu ZL,Zhou GW,et al.Global test of static stress triggering model.Acta Seismologica Sinica,2002,24(3):302~316(in Chinesewith English abstract)
[8]Hao P,Fu ZX,Tian QJ,et al.Stress triggering of stronger aftershocks of Yaoan earthquake ofMS6.5,Jan.15,2000.Earthquake Research,2004,27(3):246~251(in Chinese with English abstract)
[9]Pollitz FF.Stress triggering of the 1999 Hector Mine earthquake by transient deformation following the 1992 Landers earthquak.Bull.Seismol.Soc.Am.2002,92:1487~1496
[10]Gao GY,Nie XH,Xia AG.Initial research on earthquake sequence and focal mechanism of Jiashi earthquake ofMS6.8,in 2003.EarthquakeResearch in China,2004,20(2):179~168(in Chinese with English abstract)
[11]Zhao CP,Xia AG.Initial research on earthquake sequence and focal mechanism of Bachu-Jiashi earthquake ofMS6.8,Xinjiang.InlandEarthquake,2003,17(2):182~189(in Chinese with English abstract)
[12]Wan YG,Zhou GW,Wu ZL,et al.Comparison of focus mechanism solutions of China earthquakes.Seismollgical and Geomagnetic Observationand Research.2001,22(5):1~15(in Chinese with English abstract)
[13]Statistic group of mathematic institution of the Chinese Academy of Sciences.Common Statistic Method of Mathematics and Physics.Beijing:Science Press,1979.26~28
[14]Harris RA,Simpson RW,Reasenberg PA.Influence of static stress changes on earthquake locations in southern California.Nature,1995,375:221~224
[15]Stein RS,Barka AA,Dieterich JH.Progressive failure on the North Anatolian fault since 1939 by earthquake stress triggering.Geophys J Int,1997,128:594~604
[1]万永革,吴忠良,周公威,等.地震应力触发研究.地震学报,2002,24(5):533~551
[2]石耀霖.关于应力触发和应力影概念在地震预报中应用的一些思考.地震,2001,21(3):1~7
[6]刘桂萍,傅征祥.1973年炉霍大地震(MS=7.6)最大余震(MS=6.3)的库仑应力触发.中国地震,2002,18(2):175~182
[7]万永革,吴忠良,周公威,等.地震静态应力触发模型的全球检验.地震学报,2002,24(3):302~316
[8]郝平,田勤俭,傅征祥,等.2000年1月15日姚安6.5级地震较强余震的应力触发.地震研究,2004,27(3):246~251
[10]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):179~168
[11]赵翠萍,夏爱国.新疆巴楚—伽师6.8级地震序列震源特征的初步研究.内陆地震,2003,17(2):182~189
[12]万永革,周公威,吴忠良,等.中国地震震源机制测定结果的比较.地震地磁观测与研究,2001,22(5):1~15
[13]中国科学院数学研究所统计组编.常用数理统计方法.北京:科学出版社,1979.26~28
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