玛尼Mw7.6地震和可可西里Mw7.8地震应力迁移研究
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摘要
根据库仑破裂准则研究了1997年玛尼Mw7.6和2001年可可西里Mw7.8地震间的静态及黏弹性库仑应力的迁移。计算结果表明:静态库仑应力和黏弹性库仑应力均不超过0.005 MPa,小于典型的应力触发阈值0.01MPa;玛尼地震对可可西里孕震区应力状态的改变影响甚弱,震后造成的下地壳和上地幔的应力迁移效应对2001年可可西里地震的影响也甚弱;静态库仑应力和黏弹性库仑应力的迁移效应对可可西里地震无明显的触发作用,可能是随距离衰减相对较缓的动态库仑应力触发了可可西里地震。
The contribution of postseismic relaxation to the induced Coulomb stress and its comparison with that of static Coulomb stress changes imparted by 1997 Mw 7.6 Manyi earthquake were investigated.The results show that standard deviation of combined static and viscoelastic Coulomb stress changes and their means are not larger than 0.005 MPa,which is less than typical triggering value 0.01 MPa,indicating there was no obvious triggering effect on 2001 Kokoxili earthquake caused by static and viscoelastic Coulomb stress imparted by 1997 Manyi earthquake.Stress redistribution due to postseismic relaxation of lower crust or upper mantle didn't dramatically affect stress environment around the hypocenter of 2001 Kokoxili earthquake.It might be that the dynamic Coulomb stress decaying more slowly than those other two which offered the contribution to triggering the 2001 Kokoxili earthquake.
The contribution of postseismic relaxation to the induced Coulomb stress and its comparison with that of static Coulomb stress changes imparted by 1997 Mw 7.6 Manyi earthquake were investigated.The results show that standard deviation of combined static and viscoelastic Coulomb stress changes and their means are not larger than 0.005 MPa,which is less than typical triggering value 0.01 MPa,indicating there was no obvious triggering effect on 2001 Kokoxili earthquake caused by static and viscoelastic Coulomb stress imparted by 1997 Manyi earthquake.Stress redistribution due to postseismic relaxation of lower crust or upper mantle didn't dramatically affect stress environment around the hypocenter of 2001 Kokoxili earthquake.It might be that the dynamic Coulomb stress decaying more slowly than those other two which offered the contribution to triggering the 2001 Kokoxili earthquake.
引文
1 Stein R S,King G C P and Lin J.Change in failure stresson the southern San Andreas fault system caused by the 1992magnitude=7.4 Landers earthquake[J].Science,1992,258(1):1 328-1 332.
2 Parsons T,et al.Heightened odds of large earthquake nearIstanbul:An interaction-based probability calculation[J].2000,Science,288:661-665.
3 King G C P,et al.Static stress changes and the triggering ofearthquakes[J].Bull.Seismol.Soc.Am.,1994,84:935-953.
4 Deng J and Sykes L R.Stress evolution in southern Califor-nia and triggering of moderate,small-,and micro-sizeearthquakes[J].J.Geophys.Res.,1997,102(B11):24 411-24 435.
5 Bilek S L and Bertelloni C L.Stress changes in the CostaRica subduction zone due to the 1999Mw=6.9 Queposearthquake[J].Earth Plan.Sci.Lett.,2005,230(12):97-112.
6陈兵,等.玛尼7.9级地震对昆仑山口西8.1级地震的触发作用及动力学背景初探[J].中国地震,2003,19(1):1-7.
7万永革,等.东昆仑活动断裂带大地震之间的弹性应力触发研究[J].西北地震学报,2003,25(1):1-7.
8沈正康,等.东昆仑活动断裂带大地震之间的黏弹性应力触发研究[J].地球物理学报,2003,46(6):786-795.
9 Freed A M,Ali S Tand Burgmann R.Evolution of stress insouthern California for the past 200 years from coseismic,postseismic and interseismic stress changes[J].Geophys.J.Int.,2007,169:1 164-1 179.
10许才军,汪建军,温扬茂.震后松弛过程的粘弹性模型在玛尼地震中的应用研究[J].武汉大学学报(信息科学版),2009,34(3)(待刊).
11 Steacy S,J Gomberg and Cocco M.Introduction to specialsection:Stress transfer,earthquake triggering,and time-dependent seismic hazard[J].J.Geophys.Res.,2005,110,B05S01,doi:10.1029/2005JB003692.
12 Cocco M and Rice J R.Pore pressure and poroelasticityeffects in Coulomb stress analysis of earthquake interactions[J].J.Geophys.Res.,2002,107(B2):10.1029/2000JB000138.
13 Okada B Y.Internal deformation due to shear and tensilefaults in a half-space[J].Bull.Seismol.Soc.Am.,1992,82(2):1 018-1 040
14 Pollitz F F.Gravitational viscoelastic postseismic relaxationon a layered spherical earth[J].J.Geophys.Res.,1997,112(B8):17 921-17 941,(B05S01),doi:10.1029/2005JB003692.
15 Kilb D A.Strong correlation between induced peak dynam-ic Coulomb stress change from the 1992M7.3 Landers,California,earhthquake and the hypocenter of the 1999M7.1 Hector Mine,California,earthquake[J].J.Geo-phys.Res.,2003,108(B1):2012,doi:10.1029/2001JB000678.
16 Harris R.Introduction to special section:stress triggers,stress shadows,and implications for seismic hazard[J].J.Goephys.Res.,1998,103(B10):24 347-24 358.
17 Parsons T,Ji C and Kirby E.Stress changes from the 2008Wenchuan earthquake and increased hazard n the Sichuanbasin[J].Nature,2008,doi:10/1038/nature07177.
2 Parsons T,et al.Heightened odds of large earthquake nearIstanbul:An interaction-based probability calculation[J].2000,Science,288:661-665.
3 King G C P,et al.Static stress changes and the triggering ofearthquakes[J].Bull.Seismol.Soc.Am.,1994,84:935-953.
4 Deng J and Sykes L R.Stress evolution in southern Califor-nia and triggering of moderate,small-,and micro-sizeearthquakes[J].J.Geophys.Res.,1997,102(B11):24 411-24 435.
5 Bilek S L and Bertelloni C L.Stress changes in the CostaRica subduction zone due to the 1999Mw=6.9 Queposearthquake[J].Earth Plan.Sci.Lett.,2005,230(12):97-112.
6陈兵,等.玛尼7.9级地震对昆仑山口西8.1级地震的触发作用及动力学背景初探[J].中国地震,2003,19(1):1-7.
7万永革,等.东昆仑活动断裂带大地震之间的弹性应力触发研究[J].西北地震学报,2003,25(1):1-7.
8沈正康,等.东昆仑活动断裂带大地震之间的黏弹性应力触发研究[J].地球物理学报,2003,46(6):786-795.
9 Freed A M,Ali S Tand Burgmann R.Evolution of stress insouthern California for the past 200 years from coseismic,postseismic and interseismic stress changes[J].Geophys.J.Int.,2007,169:1 164-1 179.
10许才军,汪建军,温扬茂.震后松弛过程的粘弹性模型在玛尼地震中的应用研究[J].武汉大学学报(信息科学版),2009,34(3)(待刊).
11 Steacy S,J Gomberg and Cocco M.Introduction to specialsection:Stress transfer,earthquake triggering,and time-dependent seismic hazard[J].J.Geophys.Res.,2005,110,B05S01,doi:10.1029/2005JB003692.
12 Cocco M and Rice J R.Pore pressure and poroelasticityeffects in Coulomb stress analysis of earthquake interactions[J].J.Geophys.Res.,2002,107(B2):10.1029/2000JB000138.
13 Okada B Y.Internal deformation due to shear and tensilefaults in a half-space[J].Bull.Seismol.Soc.Am.,1992,82(2):1 018-1 040
14 Pollitz F F.Gravitational viscoelastic postseismic relaxationon a layered spherical earth[J].J.Geophys.Res.,1997,112(B8):17 921-17 941,(B05S01),doi:10.1029/2005JB003692.
15 Kilb D A.Strong correlation between induced peak dynam-ic Coulomb stress change from the 1992M7.3 Landers,California,earhthquake and the hypocenter of the 1999M7.1 Hector Mine,California,earthquake[J].J.Geo-phys.Res.,2003,108(B1):2012,doi:10.1029/2001JB000678.
16 Harris R.Introduction to special section:stress triggers,stress shadows,and implications for seismic hazard[J].J.Goephys.Res.,1998,103(B10):24 347-24 358.
17 Parsons T,Ji C and Kirby E.Stress changes from the 2008Wenchuan earthquake and increased hazard n the Sichuanbasin[J].Nature,2008,doi:10/1038/nature07177.
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