基于复合预测方法的强地震动评价研究
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摘要
以国家地震重点防御地区的调查结果为基础,基于近场强地震动预测方法体系进行了昆明普渡河-西山断裂设定地震(M6.5)的强地震场预测研究.预测方法采用三维有限差分元法和改良的统计学格林函数法组合的复合方法.针对昆明盆地三维地下结构模型和基于昆明活断层探测和危险性评价结果的特征凹凸体震源模型进行了计算.结果表明盆地构造对于盆地边缘附近地区的强地震动波形的振幅具有显著的影响作用,复合预测方法可以模拟盆地产生的面波在内的宽频带强地震动场,为基于考虑区域环境条件的近断层强地震动场基础上的城市和重要工程的地震评价提供了可能.
On the basis of the project of Kunming Active Faults and Seismic Hazard Assessment,strong ground motion in the Puduhe-Xishan earthquakes(M6.5) was predicated by the hybrid method,three-dimensional finite difference method(3DFDM) and stochastic Green′s function(SGF).3D structures of the Kunming sedimentary basin and the characterized asperity model describing source heterogeneity of the strong motion were simulated.The results indicate that the sedimentary deposits of the basin signi cantly affect the ampli cation of simulated ground motion near the basin edge and that this effect depends on the direction of wave incidence.Results demonstrate the practical simulation of wave propagation including basin induced surface waves provide a possibility for valuating the important engineering structure basing strong ground motions near-fault considered local geological conditions.
On the basis of the project of Kunming Active Faults and Seismic Hazard Assessment,strong ground motion in the Puduhe-Xishan earthquakes(M6.5) was predicated by the hybrid method,three-dimensional finite difference method(3DFDM) and stochastic Green′s function(SGF).3D structures of the Kunming sedimentary basin and the characterized asperity model describing source heterogeneity of the strong motion were simulated.The results indicate that the sedimentary deposits of the basin signi cantly affect the ampli cation of simulated ground motion near the basin edge and that this effect depends on the direction of wave incidence.Results demonstrate the practical simulation of wave propagation including basin induced surface waves provide a possibility for valuating the important engineering structure basing strong ground motions near-fault considered local geological conditions.
引文
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[9]赵伯明,陈靖,解廷伟,等.国家“十五”重大科学工程中国地震活断层探测技术系统———不同断层发育城市的强地震动研究报告[R].北京:北京交通大学,2007.
[2]Kawabe H,Kamae K.Prediction of long-periodground motions fromhuge subduction earthquakes inOsaka[J].Journal of Seismology,2008,12(2):173-184.
[3]Zhao B M,Kagawa T,Tsurugi M.Study onlong-pe-riod strong motion si mulation for large-scale earth-quakes[J].J Geophys Eng,2007,4(3):301-307.
[4]Kagawa T,Zhao B M,Miyakoshi K,et al.Modelingof the 3D basin structures for seismic wave si mula-tions based on availableinformation onthe target are-a,case study of the Osaka Basin,Japan[J].BullSeism Soc Am,2004,94:1 353-1 368.
[5]Graves R.Si mulating seismic wave propagationin 3Delastic media using staggered-grid finite differences[J].Bull Sei m Soc Am,1996,86:1 091-1 106.
[6]Clayton,Engquist.Absorbing boundary conditionsfor acoustic and elastic wave equations[J].BullSeism Soc Am,1977,67:1 529-1 540.
[7]Boore D.Stochastic si mulation of high-frequencyground motions based on seismological models of theradiated spectra[J].Bull Seism Soc Am,1983,73:1 865-1 894.
[8]Irikura K.Prediction of strong acceleration motion u-sing empirical Green's function[C]∥Proc of the 7thJapan Earthq Eng Symp.Tokyo:[s.n.],1986:151-156.
[9]赵伯明,陈靖,解廷伟,等.国家“十五”重大科学工程中国地震活断层探测技术系统———不同断层发育城市的强地震动研究报告[R].北京:北京交通大学,2007.
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