新疆伽师地区非弹性衰减、场地响应与震源参数研究
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摘要
本文用伽师地区11个数字地震台记录的地震波形资料,用Atkinson方法反演该地区地震波的非弹性衰减;用Moya方法反演11个台的场地响应。扣除地震记录中的传播路径、场地响应与仪器响应后,用遗传算法测定参与计算的76次地震震源参数。分析结果表明:伽师地区Q0值小于天山中东段地区Q0值,这表明该地区构造运动要比天山中东段剧烈,地震活动反映的情况也是如此;11个台的台基都有不同程度的放大效应。在单对数坐标下,76次地震震级与地震矩、震源尺度成正相关关系,与拐角频率成反相关关系。地震震级与应力降之间没有明显依赖关系,表明该地区地震应力降值可作为一个参数为地震预测服务。
Based on the seismic wave data recorded by 11 digital seismic stations in the Jiashi region,Xinjiang,the authors used the Atkinson methods to inverse the non-elasticity of the seismic waves of the region,and the Moya methods to inverse site response of 11 digital seismic stations.After deducting the transmitting path,site response and apparatus response from the seismic wave,we use genetic algorithm to obtain the source parameters of 76 earthquakes.The result shows:Q0 value of Jiashi region is lesser than the Q0 value of middle-east area of Tianshan.This means the tectonic activity of Jiashi region is more active than the middle-east area of Tianshan,and so is the seismic activity.The site effects of 11 seismic stations were obtained showing amplification.At the single logarithm coordinate,the relation is positive between seismic magnitude and seismic moment and hypocenter scale,but the relation is opposite between seismic magnitude and corner frequency.There is not distinct relation between seismic magnitude and stress drop.The stress drop can be used as a parameter in earthquake prediction.
Based on the seismic wave data recorded by 11 digital seismic stations in the Jiashi region,Xinjiang,the authors used the Atkinson methods to inverse the non-elasticity of the seismic waves of the region,and the Moya methods to inverse site response of 11 digital seismic stations.After deducting the transmitting path,site response and apparatus response from the seismic wave,we use genetic algorithm to obtain the source parameters of 76 earthquakes.The result shows:Q0 value of Jiashi region is lesser than the Q0 value of middle-east area of Tianshan.This means the tectonic activity of Jiashi region is more active than the middle-east area of Tianshan,and so is the seismic activity.The site effects of 11 seismic stations were obtained showing amplification.At the single logarithm coordinate,the relation is positive between seismic magnitude and seismic moment and hypocenter scale,but the relation is opposite between seismic magnitude and corner frequency.There is not distinct relation between seismic magnitude and stress drop.The stress drop can be used as a parameter in earthquake prediction.
引文
[1]中国地震局地震预测研究所“地震图像与数字化地震资料应用实验室”,2007,新的地震参数、介质参数的测定及新参数地震目录编制
傅承义、陈运泰、祁贵仲,1985,地球物理学基础,北京:科学出版社。
郭彪、刘启元、陈九辉等,2002,新疆伽师强震群区余震序列的地震台阵定位,地震地质,24(2),199～207。
黄媛、杨建思、张天中等,2006,2003年新疆巴楚-伽师地震序列的双差法重新定位研究,地球物理学报,49(1),162～169。
黄玉龙、郑斯华、刘杰等,2003,广东地区地震动衰减和场地响应的研究,地球物理学报,46(1),54～61。
兰从欣、刘杰、郑斯华等,2005,北京地区中小地震震源参数反演,地震学报,27(5),498～507。
刘杰、郑斯华、黄玉龙,2003,利用遗传算法反演非弹性衰减系数、震源参数与场地响应,地震学报,25(3),211～218。
刘丽芳、刘杰、苏有锦等,2005,2001年施甸震群非弹性衰减及震源参数特征研究,中国地震,21(4),475～485。
刘启元、陈九辉、李顺成等,2000,新疆伽师强震群区三维地壳地壳上地幔S波速度结构及其地震成因的探讨,地球物理学报,43(3),356～365。
赖院根、刘启元、陈九辉等,2002,新疆伽师强震群区的横波分裂与应力场特征,地球物理学报,45(1),83～93。
赵翠萍,2006,1997～2003年新疆伽师震源区特征的地震学方法研究[博士论文,北京:中国地震局地球物理研究所。
赵翠萍、夏爱国、郑斯华等,2005,新疆北天山中东段地区震源参数研究,中国地震,21(1),61～69。
周仕勇、许忠淮、韩京等,1999,主地震定位法分析及1997年新疆伽师强震群高精度定位,地震学报,21(3),258～265。
张先康、赵金仁、张成科等,2002,帕米尔东北侧地壳结构研究,地球物理学报,45(5),665～671。
Atkinson G.M.and Mereu R.F.,1992,The shape of ground motion attenuation curves in southeastern Canada,Bull.Seism.Soc.Am.,82,2014～2031.
Brune J.N.,1970,Tectonic stress and the spectrum of seismic shear waves from earthquakes,J.G.R.,75(26),4997～5009.
Moya C.A.,Aguirre J.and Irikura K.,2000,Inversion of source parameters and site effects from strong ground motion recordsusing genetic algorithms,Bull.Seism.Soc.Am.,90(4),977～992.
Kanamori H.,1977,The energy release in great earthquakes,Journal of Geophysical Research,82,1981～1987
Chael E.P.,1987,Spectral scaling of earthquakes in the Miramichi region of New Brunswich,Bull.Seism.Soc.Am.,77(2),347～365.
傅承义、陈运泰、祁贵仲,1985,地球物理学基础,北京:科学出版社。
郭彪、刘启元、陈九辉等,2002,新疆伽师强震群区余震序列的地震台阵定位,地震地质,24(2),199～207。
黄媛、杨建思、张天中等,2006,2003年新疆巴楚-伽师地震序列的双差法重新定位研究,地球物理学报,49(1),162～169。
黄玉龙、郑斯华、刘杰等,2003,广东地区地震动衰减和场地响应的研究,地球物理学报,46(1),54～61。
兰从欣、刘杰、郑斯华等,2005,北京地区中小地震震源参数反演,地震学报,27(5),498～507。
刘杰、郑斯华、黄玉龙,2003,利用遗传算法反演非弹性衰减系数、震源参数与场地响应,地震学报,25(3),211～218。
刘丽芳、刘杰、苏有锦等,2005,2001年施甸震群非弹性衰减及震源参数特征研究,中国地震,21(4),475～485。
刘启元、陈九辉、李顺成等,2000,新疆伽师强震群区三维地壳地壳上地幔S波速度结构及其地震成因的探讨,地球物理学报,43(3),356～365。
赖院根、刘启元、陈九辉等,2002,新疆伽师强震群区的横波分裂与应力场特征,地球物理学报,45(1),83～93。
赵翠萍,2006,1997～2003年新疆伽师震源区特征的地震学方法研究[博士论文,北京:中国地震局地球物理研究所。
赵翠萍、夏爱国、郑斯华等,2005,新疆北天山中东段地区震源参数研究,中国地震,21(1),61～69。
周仕勇、许忠淮、韩京等,1999,主地震定位法分析及1997年新疆伽师强震群高精度定位,地震学报,21(3),258～265。
张先康、赵金仁、张成科等,2002,帕米尔东北侧地壳结构研究,地球物理学报,45(5),665～671。
Atkinson G.M.and Mereu R.F.,1992,The shape of ground motion attenuation curves in southeastern Canada,Bull.Seism.Soc.Am.,82,2014～2031.
Brune J.N.,1970,Tectonic stress and the spectrum of seismic shear waves from earthquakes,J.G.R.,75(26),4997～5009.
Moya C.A.,Aguirre J.and Irikura K.,2000,Inversion of source parameters and site effects from strong ground motion recordsusing genetic algorithms,Bull.Seism.Soc.Am.,90(4),977～992.
Kanamori H.,1977,The energy release in great earthquakes,Journal of Geophysical Research,82,1981～1987
Chael E.P.,1987,Spectral scaling of earthquakes in the Miramichi region of New Brunswich,Bull.Seism.Soc.Am.,77(2),347～365.
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