基于“映射圆”模型的汶川8.0级地震峰值加速度衰减关系
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摘要
地震动衰减关系模型主要有三种类型:圆模型、断层破裂模型及椭圆模型,而这三种模型都存在一定弊端。在假设烈度与地震动存在某种线性关系的基础上,从等震线形状出发,将地震引起的断层破裂压缩到震中,压缩后的等震线从椭圆状变成反映圆模型的圆形等震线特性。用映射法描述该转变过程,并将该模型定义为地震动衰减关系的"映射圆"模型。结合汶川8.0级地震记录,分别回归出圆模型、断层破裂模型及"映射圆"模型的地震加速度峰值衰减关系。结果表明"映射圆"模型相对其它两个模型更加理想。
At present,there are three ground motion attenuation relationship models with some shortages,including circle model,fault-rupture one and ellipsoid one.Based on assuming some linear relation between intensity and ground motion,and compressing fault-rupture to epicenter,then the intensity isoseismic map would have the characters of a circle model.This process was described with a mapping method of ground motion estimation,and this model was defined as a mapping circle model.Taking Wenchuan earthquake for an instance,three models including circle model,fault-rupture one,and mapping circle one were formed regressively and respectively.The accuracy of the mapping circle model was more ideal than others.
At present,there are three ground motion attenuation relationship models with some shortages,including circle model,fault-rupture one and ellipsoid one.Based on assuming some linear relation between intensity and ground motion,and compressing fault-rupture to epicenter,then the intensity isoseismic map would have the characters of a circle model.This process was described with a mapping method of ground motion estimation,and this model was defined as a mapping circle model.Taking Wenchuan earthquake for an instance,three models including circle model,fault-rupture one,and mapping circle one were formed regressively and respectively.The accuracy of the mapping circle model was more ideal than others.
引文
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[12]黄慧华.近源地震动峰值加速度衰减关系影响因素分析[J].工程地质学报,1998,6(1):61-66. HUANG Hui-hua.Analysis of influence of factors on attenuation relation of near source ground motion peak acceleration [J].Journal of Engineering Geology,1998,6(1 ):61 - 66.
[2]Boore D M,Atkinson G M.Ground-motion prediction equations for the average horizontal component of PGA,PGV, and 5%-damped PSA at spectral periods between 0.01 s and 10.0 s[J].Earthquake Spectra,2008,24(1 ):99 - 138.
[3]Brian S J C,Youngs R R.An NGA model for the average horizontal component of peak ground motion and response spectra[J].Earthquake Spectra,2008,24(1 ):173-215.
[4]Idriss 1.An NGA empirical model for estimating the horizontal spectral values generated by shallow cnistal earthquakes[J]. Earthquake Spectra,2008,24(1 ):217 -242.
[5]Campbell K W,Bozorgnia Y.NGA ground motion model for the geometric mean horizontal component of PGA,PGV,PGD and 5%damped linear elastic response spectra for periods ranging from 0.01～10 s[J].Earthquake Spectra,2008, 24(1):139-171.
[6]胡聿贤,张敏政.缺乏强震观测资料地区地震动参数的估算方法[J].地震工程与工程振动,1984,4(1):1-11. HU Yu-xian,ZHANG Min-zheng.A method of predicting ground motion parameters for regions with poor ground motion data[J].Earthquake Engineering and Engineering Vibration, 1984,4(1):1-11.
[7]杨帆,罗奇峰.基于四区域椭圆模型的汶川8.0地震加速度峰值衰减关系拟合[J].振动与冲击,2010,29(5): 136-140. YANG Fan.LUO Qi-feng.Wenchuan 8.0 magnitude acceleration peak attenuation curve using four-area elliptical mode [J].Journal of Vibration and Shock,2010,29(5 ): 136-140.
[8]杨帆,罗奇峰.汶川地震的6区域模型加速度峰值衰减关系[J].土木建筑与环境工程,2010,32(5):29-34. YANG Fan,LUO Qi-feng.Fitting of acceleration peak attenuation with six-area model for Wenchuan 8.0 magnitude earthquake [J].Journal of Civil,Architectural & Environmental Engineering,2010,32(5 ):29 -34.
[9]胡聿贤,周克森,阎秀杰.缺乏地震动加速度记录地区地震动估计的映射法[J].地震工程与工程振动,1996, 16(3):1-10. HU Yu-xian,ZHOU Ke-seng,YAN Xiu-jie.A method for evaluation of ground motion in regions with few acceleration observation data[J].Earthquake Engineering and Engineering Vibration,1996,16(3):1 -10.
[10]地震工程与工程振动编辑委员会.汶川8.0级地震工程震害概览[M].北京:科学出版社,2008.
[11]中国地震局震害防御司.汶川8.0级地震未校正加速度记录[M].北京:地震出版社,2008.
[12]黄慧华.近源地震动峰值加速度衰减关系影响因素分析[J].工程地质学报,1998,6(1):61-66. HUANG Hui-hua.Analysis of influence of factors on attenuation relation of near source ground motion peak acceleration [J].Journal of Engineering Geology,1998,6(1 ):61 - 66.
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