用离散波数法计算层状介质中地震破裂产生的动态位移场
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摘要
设震源为一个以有限速度扩展的双侧破裂走滑断层,在1°×1°的研究范围内,采用离散波数法,首先计算出144个场点处的位移时程,最后得到了地震破裂产生的动态位移场,并讨论了其动态辐射特征.地震破裂动态位移场的计算为将来实现地震动态应力场的计算奠定了基础.
The hypocenter is supposed to be a strike-slip fault of bilateral rupture which propagates at a fi-nite speed.The range of research is 1°×1.°First,the displacement-time processes at 144 field points are calcu-lated by using the discrete-wavenumber method.Finally dynamic displacement field caused by seismic rupture is obtained.The characteristic of dynamic radiation is also discussed.The calculation of dynamic displacement field caused by seismic rupture lays foundation for the calculation of seismic dynamic stress field in the future.
The hypocenter is supposed to be a strike-slip fault of bilateral rupture which propagates at a fi-nite speed.The range of research is 1°×1.°First,the displacement-time processes at 144 field points are calcu-lated by using the discrete-wavenumber method.Finally dynamic displacement field caused by seismic rupture is obtained.The characteristic of dynamic radiation is also discussed.The calculation of dynamic displacement field caused by seismic rupture lays foundation for the calculation of seismic dynamic stress field in the future.
引文
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[9]BOUCHON M.A simple method to calculate Green’sFunctions in elastic layered media[J].Bull Seismol SocAm,1981,71:959—971.
[10]BOUCHON M.Discrete wavenumber representation ofelastic wave fields in Three-space dimensions[J].JGeophys Res,1979,84:3 609—3 614.
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[12]傅淑芳,朱仁益.高等地震学[M].北京:地震出版社,1997.
[2]KING G C P,COCCO M.Fault interaction by elasticstress changes:new clues from earthquake sequences[J].Adv Geophys,2000,44:1—38.
[3]BELARDINELLI E M,COCCO M.Redistribution ofdynamic stress during coseismic ruptures:Evidence forfault interaction and earthquake triggering[J].Journalof Geophysical Research,1999,104:14 925—14 945.
[4]KILB D,GOMBERG J,BODIN P.Triggering of earth-quake aftershocks by dynamic stresses[J].Letters toNature,2000,408:570—574.
[5]COTTON F,COUTANT O.Dynamic stress variationsdue to shear faults in a plane-layered medium[J].Geo-phys J Int,1997,128:676—688.
[6]GOMBERG J,BODIN P,KILLB D.Triggering of theMs=5.4 Little Skull Mountain,Nevada,earthquakewith dynamic strains[J].Bull Seismol Soc Am,1994,84:844—853.
[7]KENNETT B L N.Seismic wave propagation in strati-fied media[M].London:Cambridge University Press,1983.
[8]BOUCHON M,AKI K.Discrete wavenumber represen-tation of seismic source wave fields[J].Bull Seismol SocAm,1997,67:259—277.
[9]BOUCHON M.A simple method to calculate Green’sFunctions in elastic layered media[J].Bull Seismol SocAm,1981,71:959—971.
[10]BOUCHON M.Discrete wavenumber representation ofelastic wave fields in Three-space dimensions[J].JGeophys Res,1979,84:3 609—3 614.
[11]BOUCHON M.A review of the discrete wavenumbermethod[J].Pure Appl Geophys,2003,160:445—465.
[12]傅淑芳,朱仁益.高等地震学[M].北京:地震出版社,1997.
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