2008年攀枝花-会理6.1级地震强余震触发
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摘要
运用Okada方法,计算2008年8月30日攀枝花-会理Ms6.1地震在其强余震Ms5.6破裂面上产生的静态库仑破裂应力变化.结果显示,攀枝花-会理6.1级地震引起的静态库仑破裂应力变化量为0.37MPa,超过"触发阈值",该应力增量可能触发了5.6级地震的发生.
We apply Okada's method to calculate changes of static Coulomb failure stress on the largest aftershock(Ms=5.6) failure plane caused by the 2008 Ms 6.1 Panzhihua-Huili earthquake,and find that the stress change on the largest aftershock failure plane caused by the main shock is 0.37 MPa,which is larger than the typical 0.01 MPa stress change necessary for triggering earthquakes.Therefore,the largest aftershock was probably triggered by the Coulomb failure stress change caused by the main shock.
We apply Okada's method to calculate changes of static Coulomb failure stress on the largest aftershock(Ms=5.6) failure plane caused by the 2008 Ms 6.1 Panzhihua-Huili earthquake,and find that the stress change on the largest aftershock failure plane caused by the main shock is 0.37 MPa,which is larger than the typical 0.01 MPa stress change necessary for triggering earthquakes.Therefore,the largest aftershock was probably triggered by the Coulomb failure stress change caused by the main shock.
引文
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[27]李世成,张潜,郑定昌,等.攀枝花Ms6.1地震余震强震动流动观测[J].地震研究,2009,32(S):449-455.
[28]环文林,常向东,黄纬琼.地震危险性分析中的综合概率法[M].北京:地震出版社,1990:9-41.
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[30]丁国瑜,田勤俭,孔凡臣,等.活断层分段——原则、方法及应用[M].北京:地震出版社,1993.
[31]BODRI B,IIZUKAS.On the correlation between Earthtidal and microseismic activity[J].Phys Earth PlanetInter,1989,55(12):126-134.
[32]STEIN R S,KING G C P,LIN J.Stress triggering of the1994 M=6.7 Northridge,California earthquake by itspredecessors[J].Science,1994,265:1 432-1 435.
[33]JAUME S C,SYKES L R.Changes in state of stress onthe southern San Andreas Fault resulting from the Cali-fornia earthquake sequence of April to June 1992[J].Science,1992,258:1 325-1 328.
[34]张国民,傅征祥,桂燮泰,等.地震预报引论[M].北京:科学出版社,2001:372.
[35]DENG J,GURNIS M,KANAMORI H,et al.Viscoelas-tic flow in the lower crust after the 1992 Landers,Cali-fornia,earthquake[J].Science,1998,282:1 689-1 692.
[36]FREED A M,LIN J.Delayed triggering of the 1999 Hec-tor Mine earthquake by viscoelastic stress transfer[J].Nature,2001,411:180-183.
[2]SMITH S W,Van de Lindt W.Strain adjustments associ-ated with earthquakes in southern California[J].BullSeism Soc Amer,1969,59(4):1 569-1 589.
[3]RYBICHI K.Analysis of aftershocks on the basis of dis-location theory[J].Phys Earth Planet Inter,1973,7(4):409-422.
[4]陈运泰,林邦慧,林中洋,等.根据地面形变的观测研究1966年邢台地震的震源过程[J].地球物理学报,1975,18(3):164-182.
[5]罗灼礼.震源应力场、形变场和倾斜场[J].地震学报,1980,2(2):169-185.
[6]DAS S,SCHOLZ C.Off-fault aftershock clusters causedby shear stress increase[J].Bull Seism Soc Amer,1981,71(5):1 669-1 675.
[7]KATO T,RYBICKI K,KASAHARA K.Mechanical inter-action between neighboring active faults-An applicationto the Altera fault,central Japan[J].Tectonophysics,1987,144:181-188.
[8]HUDNUT K W,SEEBER L,PACHECO J.Cross-faulttriggering in the November 1987 Superstition Hills earth-quake sequence,southern California[J].Geophys ResLett,1989,16:199-202.
[9]HARRIS R A,SIMPSON R W.Changes in static stresson southern California faults after the 1992 Landersearthquake[J].Nature,1992,360:251-254.
[10]OKADA Y.Internal deformation due to shear and ten-sile faults in a half-space[J].BSSA,1992,82(2):1 018-1 040.
[11]STEIN R S,KING G C P,LIN J.Change in failurestress on the southern San Andreas fault system causedby the 1992 magnitude=7.4 Landers earthquake[J].Science,1992,258:1 328-1 332.
[12]KING G C P,STEIN R S,LIN J.Static stress changesand the triggering of earthquakes[J].BSSA,1994,84(3):935-953.
[13]GROSS S,KISSLINGER C.Estimating tectonic stressrate and state with Landers aftershocks[J].JGR,1997,102:7 603-7 612.
[14]刘桂萍,傅征祥.日本1995年1月17日兵库县南部7.2级地震触发的区域地震活动[J].地震学报,1999,21(3):250-257.
[15]刘桂萍,傅征祥.1976年7月28日唐山7.8级地震触发的区域地震活动和静应力场变化[J].地震学报,2000,22(1):17-26.
[16]刘桂萍,傅征祥.1973年炉霍大地震(Ms=7.6)最大余震(Ms=6.3)的库仑破裂应力触发[J].中国地震,2002,18(2):175-182.
[17]万永革,吴忠良,周公威,等.几次复杂地震中不同破裂事件之间的“应力触发”问题[J].地震学报,2000,22(6):568-576.
[18]郝平,傅征祥,田勤俭,等.1970年通海7.7级大地震强余震触发[J].地震,2004,24(2):38-46.
[19]郝平,傅征祥,田勤俭,等.昆仑山口西8.1级地震强余震库仑破裂应力触发研究[J].地震学报,2004,26(1):30-37.
[20]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[J].地震研究,2004,27(3):246-251.
[21]HARRIS R A.Introduction to special section:Stress trig-gers,Stress shadows,and implications for seismic haz-ard[J].J Geophys Res,1998,103(B10):24 347-24 358.
[22]REASENBERG P A,SIMPSON R W.Response of re-gional seismicity to the static stress change produced bythe Loma Prieta earthquake[J].Science,1992,255:1 687-1 690.
[23]SIMPSON R W,REASENBERG P A.Earthquake-in-duced static stress changes on central California faults[A]//Simpson R W.The Loma Prieta,CaliforniaEarthquake of October 17,1989-Tectonic processesand models[C].US Geol Surv Prof Pap,1994,1550-F,F55-F89.
[24]RICE J R.Fault stress states,pore pressure distribu-tion,and the weakness of the San Andreas fault[A]//Evans B Wong T F.Fault Mechanics and TransportProperties of Rock[C].London:Academic Press,1992,475-503.
[25]龙锋,张永久,闻学泽,等.2008年8月30日攀枝花-会理6.1级地震序列ML≥4.0事件的震源机制解[J].地球物理学报,2010,53(12):2852-2860.
[26]唐荣昌.四川活动断裂与地震[M].北京:地震出版社,1993:1-368.
[27]李世成,张潜,郑定昌,等.攀枝花Ms6.1地震余震强震动流动观测[J].地震研究,2009,32(S):449-455.
[28]环文林,常向东,黄纬琼.地震危险性分析中的综合概率法[M].北京:地震出版社,1990:9-41.
[29]李忠华,苏有锦,蔡明军,等.云南地区震源破裂长度与震级的经验公式[J].西北地震学报,1999,21(3):331-333.
[30]丁国瑜,田勤俭,孔凡臣,等.活断层分段——原则、方法及应用[M].北京:地震出版社,1993.
[31]BODRI B,IIZUKAS.On the correlation between Earthtidal and microseismic activity[J].Phys Earth PlanetInter,1989,55(12):126-134.
[32]STEIN R S,KING G C P,LIN J.Stress triggering of the1994 M=6.7 Northridge,California earthquake by itspredecessors[J].Science,1994,265:1 432-1 435.
[33]JAUME S C,SYKES L R.Changes in state of stress onthe southern San Andreas Fault resulting from the Cali-fornia earthquake sequence of April to June 1992[J].Science,1992,258:1 325-1 328.
[34]张国民,傅征祥,桂燮泰,等.地震预报引论[M].北京:科学出版社,2001:372.
[35]DENG J,GURNIS M,KANAMORI H,et al.Viscoelas-tic flow in the lower crust after the 1992 Landers,Cali-fornia,earthquake[J].Science,1998,282:1 689-1 692.
[36]FREED A M,LIN J.Delayed triggering of the 1999 Hec-tor Mine earthquake by viscoelastic stress transfer[J].Nature,2001,411:180-183.
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