山东数字地震台站场地响应估算
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摘要
为了建立山东省数字地震台站场地响应数据库,选取山东区域数字地震台网自2009年4月至2012年1月记录的M_L≥2.5地震事件,通过信噪比方法挑选出质量较高的86次地震,采用互相衔接的三段几何衰减模型,基于遗传算法,利用Moya等方法对山东省36个地震台站进行场地响应测算。其中35个台站未显示明显的放大作用,聊城台场地响应变化起伏较大,高频部分放大明显,烟台、招远、即墨、五连、菏泽台场地响应总体表现出一定衰减作用。
For the construction of database for site response of digital earthquake stations in Shandong Province,86 high quality earthquake events were chose from events M_L≥2.5 recorded by regional digital seismic network of Shandong Province from Apr.2009 to Jan.2012 by SNR method.The cross cohesion trilinear geometrical spreading model,the genetic algorithm and Moya method were combined for site response calculation of 36 seismic stations.The result shows that the amplification effect of 35 seismic stations is not obvious.While the site response of Liaocheng Seismic Station varies significantly,the high-frequency part magnified obviously.Attenuation effects were exhibited by the site responses of Yantai Seismic Station,Zhaoyuan Seismic Station,Jimo Seismic Station,Wulian Seismic Station,Heze Seismic Station.
For the construction of database for site response of digital earthquake stations in Shandong Province,86 high quality earthquake events were chose from events M_L≥2.5 recorded by regional digital seismic network of Shandong Province from Apr.2009 to Jan.2012 by SNR method.The cross cohesion trilinear geometrical spreading model,the genetic algorithm and Moya method were combined for site response calculation of 36 seismic stations.The result shows that the amplification effect of 35 seismic stations is not obvious.While the site response of Liaocheng Seismic Station varies significantly,the high-frequency part magnified obviously.Attenuation effects were exhibited by the site responses of Yantai Seismic Station,Zhaoyuan Seismic Station,Jimo Seismic Station,Wulian Seismic Station,Heze Seismic Station.
引文
季爱东,等.胶东地区地壳S波衰减系数和台站场地响应的研究[J].地震地磁观测与研究,2008,29(1):44-49.
刘杰,郑斯华,黄玉龙.利用遗传算法反演非弹性衰减系数、震源参数和场地响应[J].地震学报,2003,25(2):212-217.
石玉燕,郑斯华,胡旭辉,等.山东地区地震动衰减和场地响应的研究[J].华南地震,2008,28(1):92-100.
Atkinson G M,Mereu R F.The shape of ground motion attenuation curves in southeastern Canada[J].BSSA,1992,82:2 014-2 031.
Borcherdt R D.Effects of local geology on ground motion near San Francisco Bay[J].BSSA,1970,60:29—61.
Brune J N.Tectonic stress and the spectra of seismic shear waves from earthquake[J].JGR,1970,75(26):4 997—5 009.
Chael E P.Spectral scaling of earthquakes in the Miramichi region of New Brunswick[J].BSSA,1987,77(2):347—365.
Jin Anshu,Moya C A,Ando M.Simultaneous determination onsite response and source parameters of small earthquakes along the atosugawa fault zone,Central Japan[J].BSSA,2000,90(6):1 430—1 445.
Moya C A,Aguirre J,Irikura K.Inversion of source parameters and site effects from strong ground motion records using genetic algorithms[J].BSSA,2000,90(4):977-992.
刘杰,郑斯华,黄玉龙.利用遗传算法反演非弹性衰减系数、震源参数和场地响应[J].地震学报,2003,25(2):212-217.
石玉燕,郑斯华,胡旭辉,等.山东地区地震动衰减和场地响应的研究[J].华南地震,2008,28(1):92-100.
Atkinson G M,Mereu R F.The shape of ground motion attenuation curves in southeastern Canada[J].BSSA,1992,82:2 014-2 031.
Borcherdt R D.Effects of local geology on ground motion near San Francisco Bay[J].BSSA,1970,60:29—61.
Brune J N.Tectonic stress and the spectra of seismic shear waves from earthquake[J].JGR,1970,75(26):4 997—5 009.
Chael E P.Spectral scaling of earthquakes in the Miramichi region of New Brunswick[J].BSSA,1987,77(2):347—365.
Jin Anshu,Moya C A,Ando M.Simultaneous determination onsite response and source parameters of small earthquakes along the atosugawa fault zone,Central Japan[J].BSSA,2000,90(6):1 430—1 445.
Moya C A,Aguirre J,Irikura K.Inversion of source parameters and site effects from strong ground motion records using genetic algorithms[J].BSSA,2000,90(4):977-992.
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