随机有限断层方法模拟地震动
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摘要
随机法模拟地震动是在强地震断层破裂附近预测地震动的很重要工具之一.利用作者前期地震矩张量反演研究所获得的震源参数,基于动力学拐角频率的随机有限断层模型,采用Mo-tazedian(2009)提出的EXSIM算法,模拟了2008年10月6日西藏当雄地震,并与实际记录进行对比分析.结果表明,理论计算结果与实际记录符合得比较好.文章认为模拟方法和预测结果在本地区重大工程选址及地震危害性评价中具有参考价值.
Stochastic finite-fault method is an important tool for predicting ground motions near the rupture of large earthquakes.Based on dynamic corner frequency,this paper simulated the ground motions at LSA station for Damxung earthquake,Tibet on 6 October 2008by using the focal shock parameters gained from my previous moment tensor inversion study and the stochastic finite-fault technique of the algorithm EXSIM proposed by Motazedian(2009).Then the simulated results were compared with the observed records.The results show that the simulated results accord well with the observed acceleration response spectra.Therefore,it is concluded that the stochastic finite-fault method and the simulated results are of reference value for the location of significant projects and the evaluation of the damages resulted from earthquake.
Stochastic finite-fault method is an important tool for predicting ground motions near the rupture of large earthquakes.Based on dynamic corner frequency,this paper simulated the ground motions at LSA station for Damxung earthquake,Tibet on 6 October 2008by using the focal shock parameters gained from my previous moment tensor inversion study and the stochastic finite-fault technique of the algorithm EXSIM proposed by Motazedian(2009).Then the simulated results were compared with the observed records.The results show that the simulated results accord well with the observed acceleration response spectra.Therefore,it is concluded that the stochastic finite-fault method and the simulated results are of reference value for the location of significant projects and the evaluation of the damages resulted from earthquake.
引文
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[3]Boore D M.SMSIM-fortran programs for simulating groundmotions from Earthquakes,Version 2.0-A Revision of OFR96-80-A.U.S.[J].Geological Survey,1996,2:1-56.
[4]Boore D M,Atkinson G M.Stochastic prediction of groundmotion and spectral response parameters at hard-rock sites ineastern north America[J].Bulletin of the Seismological So-ciety of America,1987,77(2):440-467.
[5]Beresnev I A,Atkinson G M.Modeling finite-fault radiationfrom theωnSpectrum[J].Bulletin of the Seismological Socie-ty of America,1997,87(1):67-84.
[6]Beresnev I A,Atkinson G M.A FORTRAN program forsimulating stochastic acceleration time histories from finitefault[J].Seismol Res Lett,1998a,69:27-32.
[7]Beresnev I A,Atkinson G M.Stochastic finite-fault model-ing of ground motion from the 1994Northridge,California,earthquake[J].Bulletin of the Seismological Society of A-merica,1998b,88(6):1392-1401.
[8]Motazedian D,Atkinson,G M.Stochastic finite-fault mod-eling based on a dynamic corner frequency[J].Bulletin ofthe Seismological Society of America,2005,95(3):995-1010.
[9]Wu Z H,Ye P S,Barosh P J,et al.The October 6,2008Mw6.3magnitude Damxung earthquake,Yadong-Gulu rift,Tibet,and implications for present-day crustal deformation within Tibet[J].Journal of Asian Earth Sciences,2010,40(4):943-957.
[10]冯万鹏,许力生,李振洪.2008年10月当雄Mw6.3级地震断层参数的INSAR反演及其构造意义[J].地球物理学报,2010,53(5):1134-1142.
[11]金戈,陈永顺,巴桑次仁.拉萨地区及其周边的地震活动性研究[J].地球物理学报,2009,52(12):3020-3026.
[12]Armijo R,Tapponnier P,Mercier J L,et al.Quaternaryextension in southern Tibet:field observation and tectonicimplications[J].Journal of geophysical research,1986,91(14):13803-13872.
[13]西藏自治区科学技术委员会和档案馆编泽.西藏地震史料汇编(第二卷)[M].拉萨:西藏人民出版社,1982.
[14]Laba Ciren.Seismo-tectonics around Lhasa,Tibet[D].Norway:The library of University in Bergen,2011.
[15]Beresnev I A,Atkinson G M.Generic finite-fault model forground-motion prediction in eastern north America[J].Bulletin of the Seismological Society of America,1999,89(3):608-625.
[16]Yalcinkaya E.Stochastic finite-fault modeling of groundmotions from the June 27,1998 Adana-Ceyhan earthquake[J].Earth planets space,2005,57:107-115.
[17]Qiao X,Yang S,Du R,et al.Co-seismic slip from the 6October 2008,Mw6.3Damxung earthquake,Tibetan Plat-eau,constrained by InSAR observations[J].Pure Appl.Geophys,2011,168(10):1749-1758.
[18]Xie J K.Lg Q in the Eastern Tibetan Plateau[J].Bulletinof the Seismological Society of America,2002,92(2):871-876.
[19]Havskov J,Ottemller L.Routine data Processing in earth-quake seismology[M].Springer Netherlands:Springer,2010:1-347.
[2]Boore D M.Stochastic simulation of high-frequency groundmotions based on seismological models of the radiated spectra[J].Bulletin of the Seismological Society of America,1983,73(6):1865-1894.
[3]Boore D M.SMSIM-fortran programs for simulating groundmotions from Earthquakes,Version 2.0-A Revision of OFR96-80-A.U.S.[J].Geological Survey,1996,2:1-56.
[4]Boore D M,Atkinson G M.Stochastic prediction of groundmotion and spectral response parameters at hard-rock sites ineastern north America[J].Bulletin of the Seismological So-ciety of America,1987,77(2):440-467.
[5]Beresnev I A,Atkinson G M.Modeling finite-fault radiationfrom theωnSpectrum[J].Bulletin of the Seismological Socie-ty of America,1997,87(1):67-84.
[6]Beresnev I A,Atkinson G M.A FORTRAN program forsimulating stochastic acceleration time histories from finitefault[J].Seismol Res Lett,1998a,69:27-32.
[7]Beresnev I A,Atkinson G M.Stochastic finite-fault model-ing of ground motion from the 1994Northridge,California,earthquake[J].Bulletin of the Seismological Society of A-merica,1998b,88(6):1392-1401.
[8]Motazedian D,Atkinson,G M.Stochastic finite-fault mod-eling based on a dynamic corner frequency[J].Bulletin ofthe Seismological Society of America,2005,95(3):995-1010.
[9]Wu Z H,Ye P S,Barosh P J,et al.The October 6,2008Mw6.3magnitude Damxung earthquake,Yadong-Gulu rift,Tibet,and implications for present-day crustal deformation within Tibet[J].Journal of Asian Earth Sciences,2010,40(4):943-957.
[10]冯万鹏,许力生,李振洪.2008年10月当雄Mw6.3级地震断层参数的INSAR反演及其构造意义[J].地球物理学报,2010,53(5):1134-1142.
[11]金戈,陈永顺,巴桑次仁.拉萨地区及其周边的地震活动性研究[J].地球物理学报,2009,52(12):3020-3026.
[12]Armijo R,Tapponnier P,Mercier J L,et al.Quaternaryextension in southern Tibet:field observation and tectonicimplications[J].Journal of geophysical research,1986,91(14):13803-13872.
[13]西藏自治区科学技术委员会和档案馆编泽.西藏地震史料汇编(第二卷)[M].拉萨:西藏人民出版社,1982.
[14]Laba Ciren.Seismo-tectonics around Lhasa,Tibet[D].Norway:The library of University in Bergen,2011.
[15]Beresnev I A,Atkinson G M.Generic finite-fault model forground-motion prediction in eastern north America[J].Bulletin of the Seismological Society of America,1999,89(3):608-625.
[16]Yalcinkaya E.Stochastic finite-fault modeling of groundmotions from the June 27,1998 Adana-Ceyhan earthquake[J].Earth planets space,2005,57:107-115.
[17]Qiao X,Yang S,Du R,et al.Co-seismic slip from the 6October 2008,Mw6.3Damxung earthquake,Tibetan Plat-eau,constrained by InSAR observations[J].Pure Appl.Geophys,2011,168(10):1749-1758.
[18]Xie J K.Lg Q in the Eastern Tibetan Plateau[J].Bulletinof the Seismological Society of America,2002,92(2):871-876.
[19]Havskov J,Ottemller L.Routine data Processing in earth-quake seismology[M].Springer Netherlands:Springer,2010:1-347.
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