用随机方法模拟唐山7.1级余震地震动场
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摘要
在系统介绍用随机方法模拟地震动的基础上,用该方法模拟了唐山7.1级余震地震动场。模拟结果表明,唐山地区发生MS7.1级余震时,该地区产生了强烈的地震动,很多区域加速度峰值超过400cm/s2,地震断层面长65km,宽13.5km,地震过程中断层面的平均滑动为1.08m。模拟与记录的地震动持时符合得不好,其原因是随机方法中的经验关系大都是在美国大陆得到的,所以建议加强中国大陆相应的地震动经验关系的研究,使随机方法能更好地适用于中国大陆。尽管如此,由于用随机方法模拟的地震动峰值和反应谱与记录符合得比较好,这些模拟结果可以作为建筑物抗震设防的地震动输入。
Based on the systematic introduction of ground motion simulation with stochastic method,the ground motion fields of Tangshan MS7.1 aftershock was simulated with this method.Results show that the strong ground motion produced in Qian'an region when earthquake(MS7.1) took place.Peak acceleration exceeds 400 cm/s2.The fault is 65 km long,13.5 km wide,and its average slip is 1.08 m.The simulated seismic duration do not accord with that of the real records.The reason may lie in that the experiential relations used in simulation were got from the American continent.Therefore,it is suggested that experimental relations for Chinese continent should be studied.However,the peak acceleration and response spectrum obtained by simulation are in good agreement with real records,which can be used as the seismic motion input of anti-seismic design of construction.
Based on the systematic introduction of ground motion simulation with stochastic method,the ground motion fields of Tangshan MS7.1 aftershock was simulated with this method.Results show that the strong ground motion produced in Qian'an region when earthquake(MS7.1) took place.Peak acceleration exceeds 400 cm/s2.The fault is 65 km long,13.5 km wide,and its average slip is 1.08 m.The simulated seismic duration do not accord with that of the real records.The reason may lie in that the experiential relations used in simulation were got from the American continent.Therefore,it is suggested that experimental relations for Chinese continent should be studied.However,the peak acceleration and response spectrum obtained by simulation are in good agreement with real records,which can be used as the seismic motion input of anti-seismic design of construction.
引文
[1]Irikura K.Semi-empirical estimation of strong ground motions during large earthquakes.Bulletin of Dis-aster Prevention Research Institute,Kyoto Univ,1983,33(2):63-104
[2]Boore D M.Simulation of ground motion using the stochastic method.Pure Appl.Geophys.,2003,160(3-4):635-676
[3]Motazedian,Atkinson.Stochastic finite-fault modeling based on a dynamic corner frequency.BSSA,2005,95(3):995-1010
[4]罗奇峰.博士学位论文,近场加速度的半经验合成.哈尔滨:国家地震局工程力学研究所,1989
[5]刘启方.博士学位论文,基于运动学和动力学震源模型的近断层地震动研究.哈尔滨:中国地震局工程力学研究所,2005
[6]王海云.博士学位论文,近场强地震动预测的有限断层震源模型.哈尔滨:中国地震局工程力学研究所,2004
[7]Hanks T C.B value seismic source models:implication for tectonic stress variations along active crustalfault zones and the estimation of high frequency strong ground motion.J.Geophys.Res.,1979,84(B5):2235-2242
[8]McGuire R K,Hanks T C.RMS accelerations and spectral amplitudes of strong ground motion duringthe San Fernando,California earthquake.BSSA,1980,70(5):1907-1919
[9]Hanks T C,McGuire R.The character of high-frequency strong ground motion.BSSA,1981,71:2071-2095
[10]Boore D M,Boatwright J.Average body-wave radiation coefficients.BSSA,1984,74(5):1615-1621
[11]Atkinson G M,Boore D M.Ground motion relations for eastern north America.BSSA,1995,85(1):17-30
[12]Atkinson G M,Boore D M.Evaluation of models for earthquake source spectra in Eastern North Ameri-ca.BSSA.1998,88:917-934
[13]Boore D M,Joyner W B.Site amplifications for generic rock sites.BSSA,1997,87(2):327-341
[14]Beresnev I,Atkinson G.Subevent structure of large earthquakes-aground motion perspective.Geophys.Res.Lett.,2000,28:53-56
[15]Wells D,Coppersmith K.New empirical relationships among magnitude,rupture length,rupture width,rupture area and surface displacement.BSSA,1994,84(4):974-1002
[16]Somerville P G,Irikura K,Graves R,et al.Characterizing earthquake slip models for the prediction ofstrong ground motion.Seism.Res.Lett.,1999,70(1):59-80
[17]Hanks T C,Kanamori H.A moment magnitude scale.J.Geophys.Res.,1979,84(B5):2348-2350
[18]Irikura K.Recipe for predicting strong ground motions from future large earthquakes.Disaster Preven-tion Research Institute Annuals,Kyoto University,2004,47(A):25-45
[19]李文军.用余震序列的数字地震资料对卢龙地区活动构造的研究.北京:中国地震局地球物理研究所,2004
[2]Boore D M.Simulation of ground motion using the stochastic method.Pure Appl.Geophys.,2003,160(3-4):635-676
[3]Motazedian,Atkinson.Stochastic finite-fault modeling based on a dynamic corner frequency.BSSA,2005,95(3):995-1010
[4]罗奇峰.博士学位论文,近场加速度的半经验合成.哈尔滨:国家地震局工程力学研究所,1989
[5]刘启方.博士学位论文,基于运动学和动力学震源模型的近断层地震动研究.哈尔滨:中国地震局工程力学研究所,2005
[6]王海云.博士学位论文,近场强地震动预测的有限断层震源模型.哈尔滨:中国地震局工程力学研究所,2004
[7]Hanks T C.B value seismic source models:implication for tectonic stress variations along active crustalfault zones and the estimation of high frequency strong ground motion.J.Geophys.Res.,1979,84(B5):2235-2242
[8]McGuire R K,Hanks T C.RMS accelerations and spectral amplitudes of strong ground motion duringthe San Fernando,California earthquake.BSSA,1980,70(5):1907-1919
[9]Hanks T C,McGuire R.The character of high-frequency strong ground motion.BSSA,1981,71:2071-2095
[10]Boore D M,Boatwright J.Average body-wave radiation coefficients.BSSA,1984,74(5):1615-1621
[11]Atkinson G M,Boore D M.Ground motion relations for eastern north America.BSSA,1995,85(1):17-30
[12]Atkinson G M,Boore D M.Evaluation of models for earthquake source spectra in Eastern North Ameri-ca.BSSA.1998,88:917-934
[13]Boore D M,Joyner W B.Site amplifications for generic rock sites.BSSA,1997,87(2):327-341
[14]Beresnev I,Atkinson G.Subevent structure of large earthquakes-aground motion perspective.Geophys.Res.Lett.,2000,28:53-56
[15]Wells D,Coppersmith K.New empirical relationships among magnitude,rupture length,rupture width,rupture area and surface displacement.BSSA,1994,84(4):974-1002
[16]Somerville P G,Irikura K,Graves R,et al.Characterizing earthquake slip models for the prediction ofstrong ground motion.Seism.Res.Lett.,1999,70(1):59-80
[17]Hanks T C,Kanamori H.A moment magnitude scale.J.Geophys.Res.,1979,84(B5):2348-2350
[18]Irikura K.Recipe for predicting strong ground motions from future large earthquakes.Disaster Preven-tion Research Institute Annuals,Kyoto University,2004,47(A):25-45
[19]李文军.用余震序列的数字地震资料对卢龙地区活动构造的研究.北京:中国地震局地球物理研究所,2004
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