大震地震波对云南地震活动的远场动态应力触发作用
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摘要
基于云南数字地震台网记录,计算了印尼大震、昆仑山口西大震和古吉拉特邦大震的地震波在云南地区产生的远场动态库仑破裂应力变化,研究了大震产生的动态库仑破裂应力变化对云南地震活动的远场动态应力触发作用及其特征。结果显示,印尼大震产生的库仑破裂应力对云南地震活动有明显的触发作用,昆仑山口西大震产生的库仑破裂应力对云南地震活动有触发作用,但不显著,古吉拉特邦大震在云南地区产生的库仑破裂应力没有触发作用。最后分析和探讨了这3次大震触发作用差异的原因。
The changes of far-field dynamic Coulomb failure stress produced by great earthquakes in Yunnan are calculated on the basis of seismic records from 26 digital seismic stations in Yunnan by using three great earthquakes as examples including MS8.7 Indonesia earthquake,MS8.1 Kunlun earthquake and MS7.8 Gujarat earthquake in India.The far-field dynamic triggering effect of Coulomb stress changes on seismicity and their triggering characteristics are studied in Yunnan.Result shows that the dynamic Coulomb failure stress caused by the Indonesia earthquake have strong triggering effect on earthquake activity in Yunnan,the stress of Kunlun earthquake also have some triggering effect,but that of Gujarat earthquake don't have triggering effect.The physical mechanism of the different triggering effect among the three earthquakes are investigated and discussed.
The changes of far-field dynamic Coulomb failure stress produced by great earthquakes in Yunnan are calculated on the basis of seismic records from 26 digital seismic stations in Yunnan by using three great earthquakes as examples including MS8.7 Indonesia earthquake,MS8.1 Kunlun earthquake and MS7.8 Gujarat earthquake in India.The far-field dynamic triggering effect of Coulomb stress changes on seismicity and their triggering characteristics are studied in Yunnan.Result shows that the dynamic Coulomb failure stress caused by the Indonesia earthquake have strong triggering effect on earthquake activity in Yunnan,the stress of Kunlun earthquake also have some triggering effect,but that of Gujarat earthquake don't have triggering effect.The physical mechanism of the different triggering effect among the three earthquakes are investigated and discussed.
引文
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郝平,刘杰,韩竹军,等.2006.印尼MS8.7地震对中国大陆3次后续中强地震的动应力触发研究[J].地震,26(3):26-36.
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吴小平,黄庸,胡家富,等.2008.汶川MS8.0巨震产生的完全库仑破裂应力变化及其强余震群[J].地震研究,31(4):317-323.
许力生,陈运泰,高孟潭.2002.2001年1月26日印度古吉拉特邦(Gujarat)MS7.8地震时空破裂过程[J].地震学报,24(5):447-461.
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张国民,张晓东,刘杰,等.2005.印尼苏门答腊8.7级大震对中国陆区的影响[J].地震,25(4):15-25.
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B is was N,Knopoff L.1970Exact-earth-flattening calculation for Lovewaves[J].BSSA,60:1123-1137.
B is was N.1972.Earth-flattening procedure for the propagation of Ray-leigh wave[J].Pure Appl Geophys,96:61-74.
B ro dsky E E,Karakostas V,Kanamori H.2000.A new observation ofdynamically triggered regional seismicity:earthquakes in Greece fol-lowing the August,1999Izmit,Turkey,earthquake[J].Geo-phys Res Lett,27:2741-2744.
C o tton F,Coutant O.1997.Dynamic stress variations due to shear faultsin a plane-layered medium[J].GJI,128:676-688.
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G o mberg J,Bodin P,Reasenberg P.2003.Observing earthquakes trig-gered in the near field by dynamic deformations[J].BSSA,93:118-138.
G o mberg J,Reasenberg P A,Bodin P,et al.2001.Earthquake trigge-ring by seismic waves following the Landers and Hector Mine earth-quakes[J].Nature,411:462-466.
H a rris R A.1998.Introduction to special section:stress triggers,stressshadows,and implications for seismic hazard[J].JGR,103:24347-24358.
K e nnett B L N,Kerry N J.1979.Seismic waves in a stratified half space[J].Geophys J R.astr Soc,57:557-583.
K e nnett B LN.1983.Seismic wave propagation in stratified media[M].London:Cambridge University Press.
K il b D,Ellis M,Gomberg J,et al.1997.On the origin diverse after-shock mechanisms following the1989Loma Prieta earthquake[J].GJI,128:557-570.
K il b D,Gomberg J,Bodin P.2000.Triggering of earthquake aftershocksby dynamic stresses[J].Nature,408:570-574.
N o stro C,Cocco M,Belardinelli ME.1997.Static stress changes in ex-tensional regimes:An application to southern Apennines(Italy)[J].BSSA,87:234-248.
P re jean S G,Hill D P,Brodsky E E,et al.2004.Remotely triggeredseismicity on the United States west coast following theMW7.9De-nali fault earthquake[J].BSSA,94:s348-s359.
Sp udich P,Steck L K,Hellweg M,et al.1995.Transient stress atParkfield,California,produced by the M7.4Landers earthquakeof June28,1992:Observations from the UPSAR dense seismo-graph array[J].JGR,100:675-690.
Ste in R S.1999.The role of stress transfer in earthquake occurrence[J].Nature,402:605-609.
高星,王卫民,姚振兴.2005.中国及邻近地区地壳结构[J].地球物理学报,48(3):591-601.
郝平,刘杰,韩竹军,等.2006.印尼MS8.7地震对中国大陆3次后续中强地震的动应力触发研究[J].地震,26(3):26-36.
胡家富,苏有锦,朱雄关,等.2003.云南的地壳s波速度与泊松比结构及其意义[J].中国科学(D辑),33(8):714-722.
皇甫岗,石绍先,苏有锦.2000.20世纪云南地震活动研究[J].地震研究,23(1):1-9.
李峰,薛传东.1999.滇西北新生代以来地球动力学背景及其环境影响[J].大地构造与成矿学,26(2):115-122.
万永革,吴忠良,周公威,等.2002.地震应力触发研究[J].地震学报,24(5):533-551.
吴小平,付虹,Bouchon M,等.2007.完全库仑破裂应力变化与云南龙陵震群序列的应力触发[J].地球物理学报,50(4):1111-1122.
吴小平,黄庸,胡家富,等.2008.汶川MS8.0巨震产生的完全库仑破裂应力变化及其强余震群[J].地震研究,31(4):317-323.
许力生,陈运泰,高孟潭.2002.2001年1月26日印度古吉拉特邦(Gujarat)MS7.8地震时空破裂过程[J].地震学报,24(5):447-461.
许力生,陈运泰.2004.从全球长周期波形资料反演2001年11月14日昆仑山口地震时空破裂过程[J].中国科学(D辑),34(3):256-264.
许志琴,杨经绥,戚学祥,等.2006.印度/亚洲碰撞南北向和东西向拆离构造与现代喜马拉雅造山机制再讨论[J].地质通报,25(1):1-14.
张国民,张晓东,刘杰,等.2005.印尼苏门答腊8.7级大震对中国陆区的影响[J].地震,25(4):15-25.
A n derson J G,Brune J N,Louie J N,et al,Seismicity in the WesternGreat basin apparently triggered by the Landers,California,earth-quake,28June1992[J].BSSA,84:863-891.
B is was N,Knopoff L.1970Exact-earth-flattening calculation for Lovewaves[J].BSSA,60:1123-1137.
B is was N.1972.Earth-flattening procedure for the propagation of Ray-leigh wave[J].Pure Appl Geophys,96:61-74.
B ro dsky E E,Karakostas V,Kanamori H.2000.A new observation ofdynamically triggered regional seismicity:earthquakes in Greece fol-lowing the August,1999Izmit,Turkey,earthquake[J].Geo-phys Res Lett,27:2741-2744.
C o tton F,Coutant O.1997.Dynamic stress variations due to shear faultsin a plane-layered medium[J].GJI,128:676-688.
G o mberg J,Blanpied M L,Beeler N M.1997.Transient triggering ofnear and distant earthquakes[J].BSSA,84:844-853.
G o mberg J,Bodin P,Larson K,et al.2004.Earthquake nucleation bytransient deformations caused by the M=7.9Denali,Alaska,earthquake[J].Nature,427:621-624.
G o mberg J,Bodin P,Reasenberg P.2003.Observing earthquakes trig-gered in the near field by dynamic deformations[J].BSSA,93:118-138.
G o mberg J,Reasenberg P A,Bodin P,et al.2001.Earthquake trigge-ring by seismic waves following the Landers and Hector Mine earth-quakes[J].Nature,411:462-466.
H a rris R A.1998.Introduction to special section:stress triggers,stressshadows,and implications for seismic hazard[J].JGR,103:24347-24358.
K e nnett B L N,Kerry N J.1979.Seismic waves in a stratified half space[J].Geophys J R.astr Soc,57:557-583.
K e nnett B LN.1983.Seismic wave propagation in stratified media[M].London:Cambridge University Press.
K il b D,Ellis M,Gomberg J,et al.1997.On the origin diverse after-shock mechanisms following the1989Loma Prieta earthquake[J].GJI,128:557-570.
K il b D,Gomberg J,Bodin P.2000.Triggering of earthquake aftershocksby dynamic stresses[J].Nature,408:570-574.
N o stro C,Cocco M,Belardinelli ME.1997.Static stress changes in ex-tensional regimes:An application to southern Apennines(Italy)[J].BSSA,87:234-248.
P re jean S G,Hill D P,Brodsky E E,et al.2004.Remotely triggeredseismicity on the United States west coast following theMW7.9De-nali fault earthquake[J].BSSA,94:s348-s359.
Sp udich P,Steck L K,Hellweg M,et al.1995.Transient stress atParkfield,California,produced by the M7.4Landers earthquakeof June28,1992:Observations from the UPSAR dense seismo-graph array[J].JGR,100:675-690.
Ste in R S.1999.The role of stress transfer in earthquake occurrence[J].Nature,402:605-609.
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