湖北地区地震震源参数研究
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摘要
为了研究湖北地区地震震源参数特征,本文基于湖北数字地震台网记录到的S波观测振幅谱,通过遗传算法获得湖北地区的介质品质因子和台站场地响应,并在此基础上计算了湖北地区地震震源参数。结果显示,湖北地区介质品质因子Q值随频率f变化的关系式为Q(f)=501.8·f~(0.309);对于大部分台站获得了与其岩石基底相符的场地响应,没有出现明显放大效应;地震震级与地震矩对数间呈线性关系,即lg M_0=10.06+1.093M_L;震源半径与应力降间呈双对数线性关系,即lgΔσ=10.52-2.01lgr;地震矩与拐角频率间整体上呈反相关;地震矩与应力降间关系不显著。
Based on the amplitude of S-wave spectrum recorded at the Hubei Telemetered Network, the paper studies the source parameter of the Hubei area. We use the genetic algorithm inversion to obtain the non-elastic damping coefficient and site response of each station,and calculate the source parameter of the Hubei area on this basis. The results show that the frequency dependent non-elasticity coefficient Q in the Hubei area is estimated as Q(f) = 501.8·f~(0.309) and most of the stations have no obvious amplification effect,which is consistent with the rock foundation. The earthquake magnitude is linear with the logarithm of the seismic moment : lgM_0=10.06+1.093 M_L; focal radius and stress drop in double logarithmic linear relationship : lg△σ=10.52-2.00 lgr, the relationship of seismic moment and corner frequency is negatively related to the whole; the relationship of seismic moment the earthquake stress drop is not significant.
Based on the amplitude of S-wave spectrum recorded at the Hubei Telemetered Network, the paper studies the source parameter of the Hubei area. We use the genetic algorithm inversion to obtain the non-elastic damping coefficient and site response of each station,and calculate the source parameter of the Hubei area on this basis. The results show that the frequency dependent non-elasticity coefficient Q in the Hubei area is estimated as Q(f) = 501.8·f~(0.309) and most of the stations have no obvious amplification effect,which is consistent with the rock foundation. The earthquake magnitude is linear with the logarithm of the seismic moment : lgM_0=10.06+1.093 M_L; focal radius and stress drop in double logarithmic linear relationship : lg△σ=10.52-2.00 lgr, the relationship of seismic moment and corner frequency is negatively related to the whole; the relationship of seismic moment the earthquake stress drop is not significant.
引文
陈运泰、吴忠良,1999,中国数字地震学的发展战略问题,国际地震动态,(5),1-5.
高景春、赵英萍、徐志国等,2011,河北省测震台网中小地震矩震级的测定,华北地震科学,29(2),1-5.
郭晓、张元生、莘海亮等,2008,青藏高原东北缘地区非弹性衰减Q值和场地响应的研究,地震研究,31(2),114-118.
华卫、陈章立、郑斯华等,2010,三峡水库地区震源参数特征研究,地震地质,32(4),533-542.
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.
梁向军、刘林飞、张玲等,2012,利用遗传算法反演山西地区非弹性衰减系数、场地响应和震源参数,大地测量与地球动力学,32(增刊Ⅰ),18-21,27.
刘杰、郑斯华、黄玉龙,2003,利用遗传算法反演非弹性衰减系数、震源参数和场地响应,地震学报,25(2),211-218.
魏贵春、姚运生、廖武林等,2017,南水北调中线工程核心水源区地震波Q值分析,大地测量与地球动力学,37(2),142-145.
赵翠萍、陈章立、华卫等,2011,中国大陆主要地震活动区中小地震震源参数研究,地球物理学报,54(6),1478-1489.
Aki K, Richards P G, 1980, Quantitative Seismology:Theory and Methods VolumeⅡ,825,San Francisco:W H Freeman.
Atkinson G M,Mereu R F, 1992,The shape of ground motion attenuation curves in southeastern Canada, Bull Seismol Soc Am,82(5),2014-2031.
Brune J N,1970,Tectonic stress and the spectra of seismic shear waves from earthquakes,J Geophys Res,75(26),4997-5009.
Moya A,2000, Inversion of source parameters and site effects from strong ground motion records using genetic algorithms, Bull Seismol Soc Am,90(4),977-992.
高景春、赵英萍、徐志国等,2011,河北省测震台网中小地震矩震级的测定,华北地震科学,29(2),1-5.
郭晓、张元生、莘海亮等,2008,青藏高原东北缘地区非弹性衰减Q值和场地响应的研究,地震研究,31(2),114-118.
华卫、陈章立、郑斯华等,2010,三峡水库地区震源参数特征研究,地震地质,32(4),533-542.
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.
梁向军、刘林飞、张玲等,2012,利用遗传算法反演山西地区非弹性衰减系数、场地响应和震源参数,大地测量与地球动力学,32(增刊Ⅰ),18-21,27.
刘杰、郑斯华、黄玉龙,2003,利用遗传算法反演非弹性衰减系数、震源参数和场地响应,地震学报,25(2),211-218.
魏贵春、姚运生、廖武林等,2017,南水北调中线工程核心水源区地震波Q值分析,大地测量与地球动力学,37(2),142-145.
赵翠萍、陈章立、华卫等,2011,中国大陆主要地震活动区中小地震震源参数研究,地球物理学报,54(6),1478-1489.
Aki K, Richards P G, 1980, Quantitative Seismology:Theory and Methods VolumeⅡ,825,San Francisco:W H Freeman.
Atkinson G M,Mereu R F, 1992,The shape of ground motion attenuation curves in southeastern Canada, Bull Seismol Soc Am,82(5),2014-2031.
Brune J N,1970,Tectonic stress and the spectra of seismic shear waves from earthquakes,J Geophys Res,75(26),4997-5009.
Moya A,2000, Inversion of source parameters and site effects from strong ground motion records using genetic algorithms, Bull Seismol Soc Am,90(4),977-992.