用随机模拟方法研究设定地震地面运动
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摘要
用随机模拟方法研究设定地震地面运动可分两步进行:(1)采用中小地震的数字观测资料确定研究区路径、场地参数;(2)把确定的参数应用到研究区的强地面运动随机模拟中.为此,本文首先采用了一种可行的方法,分离软基岩场地效应和非弹性衰减的影响,并把二者分别确定出来.研究区北部中软基岩场地的平均效应在2~4Hz频率范围为1.5倍左右;研究区的S波品质因子为QS=278f0.346.把这些参数用于研究区的场地和路径模型中,并选择单拐角频率震源谱模型,随机模拟了研究区未来中强地震可能在北天山中段可能造成的地面运动,模拟加速度时程和反应谱可以服务于本地区的地震灾害预测和建筑物可靠性验算.
Studying the ground motions of scenario earthquake using stochastic simulation method needs two steps.(1)Using digital seismic data of small-moderate earthquake to study the parameters of path and site. (2)Applying the determined parameters to stochastic simulation of ground motion. For that, we firstly use a feasible method to separate the site effect of soft rock and the anelastic attenuation of path. The average site effect of soft rock in the northern part of the research region reaches 1.5 or so in 2～4Hz. The S wave quality factor of the research region is obtained as Q_S=278f~ 0.346 . Secondly, we apply these parameters to the model of site and path in the region, and choose source spectrum of single corner frequency. Then, we simulate the possible ground motions of the middle area of Northern Tianshan from future moderate-strong earthquakes in the research region. The resultant acceleration histories and spectra of ground motions may serve for evaluating earthquake disaster and checking the reliability of buildings in this region.
Studying the ground motions of scenario earthquake using stochastic simulation method needs two steps.(1)Using digital seismic data of small-moderate earthquake to study the parameters of path and site. (2)Applying the determined parameters to stochastic simulation of ground motion. For that, we firstly use a feasible method to separate the site effect of soft rock and the anelastic attenuation of path. The average site effect of soft rock in the northern part of the research region reaches 1.5 or so in 2～4Hz. The S wave quality factor of the research region is obtained as Q_S=278f~ 0.346 . Secondly, we apply these parameters to the model of site and path in the region, and choose source spectrum of single corner frequency. Then, we simulate the possible ground motions of the middle area of Northern Tianshan from future moderate-strong earthquakes in the research region. The resultant acceleration histories and spectra of ground motions may serve for evaluating earthquake disaster and checking the reliability of buildings in this region.
引文
[1]冯启明.《地震灾害预测及其信息管理系统技术规范(GB/T19428-2003)》宣贯教材.北京:中国标准出版社,2004.16~17Feng Q M.《Code for earthquake disaster evalution and its information management system(GB/T19428-2003)》-Teaching materials of propaganda.Beijing:Standards Press of China,2004.16~17
[2]Boore D M.Simulation of ground motion usingthe stochastic method.Pure Appl.Geophys.,2003,160:635~676
[3]姜慧.地震动随机模拟方法中的场地效应研究[博士论文].北京:中国地震局地球物理研究所,2005,31~42Jiang H.Study on site effect of stochastic simulation of earthquake ground motions[Ph.D.thesis].Beijing:Institute of Geophysics,China Earthquake Administration,2005,31~42
[4]Lam NTK,Wilson J L,Chandler A M,Hutchinson GL.Response spectrum modelling for rock sites in low and moderate seismicity regions combining velocity,displacement and acceleration predictions.Earthq.Engrg.Struct.Dyn.2000,29:1491~1525
[5]Brune J N.Tectonic stress and the spectra of seismic shear waves fromearthquakes.J.Geophys.Res.,1970,75:4997~5009
[6]Atkinson G M.Attenuation of strong ground motionin Canada froma randomvibrations approach.Bull.Seism.Soc.Am.,1984,74(6):2629~2631
[7]Jiang Hui,Gao Mentan,Yu Yanxiang,Zhao Cuiping.Determinationofthe combined effect of amplification and attenuation of soft rock site using digital seismic data.Acta Seismologica Sinica,2004,17(Suppl.):157~162
[8]赵翠萍,夏爱国,郑斯华等.新疆北天山中东段地区震源参数研究.中国地震,2005,21(1):61~69Zhao C P,Xia AG,Zheng S H,et al.Study on source parameters of earthquakes occurred onthe Middle-East area of Northern Tianshanin Xinjiang.Earthquake Researchin China,2005,21(1):61~69
[9]Chin Byau-Heng,Aki K.Simultaneous determination of source,path,and recording site effects on strong ground motion during theLoma Prieta earthquake-a preliminary result on pervasive non-liner site effect.Bull.Seism.Soc.Am.1991,81(5):1859~1884
[10]黄玉龙,郑斯华,刘杰等.广东地区地震动衰减和场地响应的研究.地球物理学报,2003,46(1):51~61Huang Y L,Zheng S H,Liu J,et al.Attenuation of ground motion and site response in Guangdong region.Chinese J.Geophys.(in Chinese),2003,46(1):51~61
[11]Frankel A,Mueller C,Barnhard T,et al.National seismic hazard maps.U.S.Geol.Surv.Open-File Rept,1996.96~532
[2]Boore D M.Simulation of ground motion usingthe stochastic method.Pure Appl.Geophys.,2003,160:635~676
[3]姜慧.地震动随机模拟方法中的场地效应研究[博士论文].北京:中国地震局地球物理研究所,2005,31~42Jiang H.Study on site effect of stochastic simulation of earthquake ground motions[Ph.D.thesis].Beijing:Institute of Geophysics,China Earthquake Administration,2005,31~42
[4]Lam NTK,Wilson J L,Chandler A M,Hutchinson GL.Response spectrum modelling for rock sites in low and moderate seismicity regions combining velocity,displacement and acceleration predictions.Earthq.Engrg.Struct.Dyn.2000,29:1491~1525
[5]Brune J N.Tectonic stress and the spectra of seismic shear waves fromearthquakes.J.Geophys.Res.,1970,75:4997~5009
[6]Atkinson G M.Attenuation of strong ground motionin Canada froma randomvibrations approach.Bull.Seism.Soc.Am.,1984,74(6):2629~2631
[7]Jiang Hui,Gao Mentan,Yu Yanxiang,Zhao Cuiping.Determinationofthe combined effect of amplification and attenuation of soft rock site using digital seismic data.Acta Seismologica Sinica,2004,17(Suppl.):157~162
[8]赵翠萍,夏爱国,郑斯华等.新疆北天山中东段地区震源参数研究.中国地震,2005,21(1):61~69Zhao C P,Xia AG,Zheng S H,et al.Study on source parameters of earthquakes occurred onthe Middle-East area of Northern Tianshanin Xinjiang.Earthquake Researchin China,2005,21(1):61~69
[9]Chin Byau-Heng,Aki K.Simultaneous determination of source,path,and recording site effects on strong ground motion during theLoma Prieta earthquake-a preliminary result on pervasive non-liner site effect.Bull.Seism.Soc.Am.1991,81(5):1859~1884
[10]黄玉龙,郑斯华,刘杰等.广东地区地震动衰减和场地响应的研究.地球物理学报,2003,46(1):51~61Huang Y L,Zheng S H,Liu J,et al.Attenuation of ground motion and site response in Guangdong region.Chinese J.Geophys.(in Chinese),2003,46(1):51~61
[11]Frankel A,Mueller C,Barnhard T,et al.National seismic hazard maps.U.S.Geol.Surv.Open-File Rept,1996.96~532
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