甘东南地区非弹性衰减系数、震源参数和场地响应研究
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摘要
利用甘肃数字地震台网的波形记录,基于遗传算法,首先用Atkinson方法计算非弹性衰减系数,在此基础上用Moya方法同时反演震源参数和场地响应。反演结果表明:甘东南地区非弹性衰减Q值与频率的关系为Q(f)=404.2f0.264;9个台站中除了天水台,其余台站的场地响应均没有显示明显的放大效应,这与其均处于岩石地基的情况相吻合;研究区地震的应力降范围为1～70bar;震源参数拐角频率与地震矩、地震矩与震级之间存在较明显的依赖关系。
Using digital seismograms recorded by the Gansu Digital Seismic Network,the inelastic attenuation coefficient is calculated based on genetic algorithm and a method proposed by Atkinson.Then,the site response and source parameters are investigated by the Moya method.The inversion results indicate the frequency-dependent of inelastic attenuation Q value in the southeast area of Gansu is estimated as Q(f)=404.2f 0.264.Except the Tianshui station,the site response of the others do not show significant amplifications,which is consistent with their basement on rocks.The stress drops of 39 earthquakes range from 0.1MPa to 7MPa.It is also found the dependence of corner frequency on seismic moment,seismic magnitude.
Using digital seismograms recorded by the Gansu Digital Seismic Network,the inelastic attenuation coefficient is calculated based on genetic algorithm and a method proposed by Atkinson.Then,the site response and source parameters are investigated by the Moya method.The inversion results indicate the frequency-dependent of inelastic attenuation Q value in the southeast area of Gansu is estimated as Q(f)=404.2f 0.264.Except the Tianshui station,the site response of the others do not show significant amplifications,which is consistent with their basement on rocks.The stress drops of 39 earthquakes range from 0.1MPa to 7MPa.It is also found the dependence of corner frequency on seismic moment,seismic magnitude.
引文
啜永清、苏燕、贾建喜等,2004,山西地区非弹性衰减系数、场地响应和几种震源参数的研究,地震学报,26(4),369～378。
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李白基、秦嘉政、钱晓东等,2004,云南姚安地区的尾波衰减.地震学报,26(1),47～52。
刘杰、郑斯华、黄玉龙等,2003,利用遗传算法反演非弹性衰减系数、震源参数和场地响应,地震学报,25(2),211～218。
苏有锦、刘杰、郑斯华等,2006,云南地区S波非弹性衰减Q值研究,地震学报,28(2),206～212。
黄玉龙、郑斯华、刘杰等,2002,广东地区地震波衰减和场地响应的研究,地球物理学报,46(1),54～61。
袁道阳、何文贵、刘小凤等,2006,10余年来甘肃省中强地震的发震构造特征,西北地震学报,28(3),235～241。
周民都、吕太乙、张元生等,2000,青藏高原东北缘地质构造背景及地壳结构研究,地震学报,22(6),645～653。
Atkinson G M,Mereu RF,1992,The shape of ground motion attenuation curves in Southeastern Canada,Bull SeismSoc Amer,82,2014～2031.
Atkinson G M,Boore D,1995,Newground motion relations for eastern North America,Bull SeismSoc Amer,85,17～30.
Brune J N,1970,Tectonic stress andthe spectra of seismic shear waves fromearthquake,J Geophys,Research,75,4997～5009.
Moya A,Aguirre J,Irikura K,2000,Inversion of source parameters and site effects fromstrong ground motion records using geneticalgorithms,Bull Seis Soc Amer,90(4),977～992.
Wessel Pand Smith WHF,2004,The Generic Mapping Tools,version4.0released,http://gmt.soest.hawaii.edu.
王勤彩、高景春、郑斯华等,2004,华北中北部地区震源参数和场地响应的联合反演.中国地震,20(2),187～196。
李白基、秦嘉政、钱晓东等,2004,云南姚安地区的尾波衰减.地震学报,26(1),47～52。
刘杰、郑斯华、黄玉龙等,2003,利用遗传算法反演非弹性衰减系数、震源参数和场地响应,地震学报,25(2),211～218。
苏有锦、刘杰、郑斯华等,2006,云南地区S波非弹性衰减Q值研究,地震学报,28(2),206～212。
黄玉龙、郑斯华、刘杰等,2002,广东地区地震波衰减和场地响应的研究,地球物理学报,46(1),54～61。
袁道阳、何文贵、刘小凤等,2006,10余年来甘肃省中强地震的发震构造特征,西北地震学报,28(3),235～241。
周民都、吕太乙、张元生等,2000,青藏高原东北缘地质构造背景及地壳结构研究,地震学报,22(6),645～653。
Atkinson G M,Mereu RF,1992,The shape of ground motion attenuation curves in Southeastern Canada,Bull SeismSoc Amer,82,2014～2031.
Atkinson G M,Boore D,1995,Newground motion relations for eastern North America,Bull SeismSoc Amer,85,17～30.
Brune J N,1970,Tectonic stress andthe spectra of seismic shear waves fromearthquake,J Geophys,Research,75,4997～5009.
Moya A,Aguirre J,Irikura K,2000,Inversion of source parameters and site effects fromstrong ground motion records using geneticalgorithms,Bull Seis Soc Amer,90(4),977～992.
Wessel Pand Smith WHF,2004,The Generic Mapping Tools,version4.0released,http://gmt.soest.hawaii.edu.
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