基于NGA模型的汶川地震区地震动衰减关系
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摘要
基于汶川地震64个余震强震动记录数据,结合NGA衰减关系模型以及一维场地非线性反应模型,应用基于最大可能性估计的统计算法,对峰值加速度、峰值速度、峰值位移以及不同周期的加速度反应谱进行了衰减关系研究。得到了汶川地震区基岩场地以及各类土层场地的地震动衰减关系。与其他人的研究成果对比,表明NGA模型衰减关系估计的基岩场地地震动相对较低,而估计的土层场地地震动相对较高。
Strong motion records of 64 Wenchuan Earthquake aftershocks are processed.Using the NGA model and 1D nonlinear site response analysis model,the attenuation relationships of ground motion for Wenchuan Earthquake region on various site classes are extracted from the records.The attenuation relationships are presented in terms of the peak ground accelerations,peak ground velocities and spectral accelerations for several periods.In comparison with other research results,it is shown that the predicted ground motions from NGA model are lower on rock sites but higher on soil sites.
Strong motion records of 64 Wenchuan Earthquake aftershocks are processed.Using the NGA model and 1D nonlinear site response analysis model,the attenuation relationships of ground motion for Wenchuan Earthquake region on various site classes are extracted from the records.The attenuation relationships are presented in terms of the peak ground accelerations,peak ground velocities and spectral accelerations for several periods.In comparison with other research results,it is shown that the predicted ground motions from NGA model are lower on rock sites but higher on soil sites.
引文
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[9]BOORE D M,LAMPREY J W,ABRAHAMSON N A.Orientation-independent measures of ground motion[J].Bull Seism Soc Am,2006,96:1502-1511.
[10]WALLING M,SILVA W J,ABRAHAMSON N A.Nonlinear site amplification factors for constraining the NGA models[J].Earthquake Spectra,2008,24:243-256.
[11]ABRAHAMSON N A,YOUNGS R R.A stable algorithm for regression analyses using the random effect model[J].Bull Seism Soc Am,1992,82:505-510.
[2]俞言祥,汪素云.中国东部和西部地区水平向基岩加速度反应谱衰减关系[J].震灾防御技术,2006,1(3):206-217.(YU Yan-xiang,WANG Su-yun.Attenuation relations for horizontal peak ground acceleration and response spectrum in eastern and western China[J].Technology for Earthquake Disaster Prevention,2006,1(3):206-217.(in Chinese))
[3]雷建成,高孟潭,俞言祥.四川及邻区地震动衰减关系[J].地震学报,2007,29(5):500-511.(LEI Jian-cheng,GAO Meng-tan,YU Yan-xiang.Seismic motion attenuation relations in Sichuan and adjacent areas[J].Acta Seismologica Sinica,2007,29(5):500-511.(in Chinese))
[4]LI Xiao-jun.Strong motions and engineering structure performances in recent major earthquakes[J].Earthquake Science,2010,23(1):1-3.
[5]卢大伟,李小军,崔建文.汶川中强余震地震动峰值衰减关系[J].应用基础与工程科学学报,2010,18(增刊1):138-151.(LU Da-wei,LI Xiao-jun,CUI Jian-wen.Ground motion attenuation of the wenchuan aftershocks[J].Journal of Basic Science and Engineering,2010,18(S1):138-151.(in Chinese))
[6]康兰池,金星.四川地区中小地震地震动衰减规律研究[J].地震学报,2009,31(4):403-410.(KANG Lan-chi,JIN Xing.Ground motion attenuation relation for small to moderate earthquakes in Sichuan region[J].Acta Seismologica Sinica,2009,31(4):403-410.(in Chinese))
[7]BOORE D M.Estimating Vs(30)(or NEHRP Site Classes)from sallow velocity models(Depth<30 m)[J].Bull Seism Soc Am,2004,94:591-597.
[8]CAMPBELL K W,BOZORGNIA Y.NGA ground motion for the geometric mean horizontal component of PGA,PGV,PGD and 5%damped linear elastic response spetra for periods ranging from 0.01 to 10s[J].Earthquake Spectra,2008,24:139-172.
[9]BOORE D M,LAMPREY J W,ABRAHAMSON N A.Orientation-independent measures of ground motion[J].Bull Seism Soc Am,2006,96:1502-1511.
[10]WALLING M,SILVA W J,ABRAHAMSON N A.Nonlinear site amplification factors for constraining the NGA models[J].Earthquake Spectra,2008,24:243-256.
[11]ABRAHAMSON N A,YOUNGS R R.A stable algorithm for regression analyses using the random effect model[J].Bull Seism Soc Am,1992,82:505-510.
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