江西地区地震动非弹性衰减和场地响应特征研究  

Study on Inelastic Attenuation and Site Response in Jiangxi Area

作　　者：肖孟仁 陈浩 罗丽 查小惠 郭江春 XIAO Mengren;CHEN Hao;LUO Li;ZHA Xiaohui;GUO Jiangchun(Jiangxi Earthquake Agency,6929 Changdong Avenue,Nanchang 330026,China)

机构地区：[1]江西省地震局

出　　处：《大地测量与地球动力学》2020年第3期287-290,298,共5页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震科技星火计划(XH16023);江西省地震局青年基金(JXDZ-KY-201601)~~

摘　　要：以2009年以来江西省地震台网记录到的86个M L2.5以上地震事件的波形资料为研究对象,通过遗传算法获得介质的品质因子和台站场地响应,并在此基础上计算地震的震源谱参数。结果显示,江西地区Q值与频率f的关系式为Q(f)=323.1f 0.5059;大部分台站的场地响应在频率域表现为平坦型,整体上与台站基岩性质相符;近震级M L与地震矩M 0在单对数坐标下呈线性关系,地震矩与拐角频率呈负相关特征,应力降与地震矩之间没有显著相关性;震源半径与应力降存在显著的双对数关系。Based on 86 M L≥2.5 seismic events waveform recorded in Jiangxi since 2009,we use genetic algorithm inversion to obtain the non-elastic damping coefficient in site response of each station,calculating the source parameter on the basis.The results show that the frequency dependent non-elasticity coefficient Q in Jiangxi area is estimated as Q(f)=323.1f 0.5059 and the site response of most stations is flat in frequency domain,consistent with the bedrock property of the stations.We find a linear relationship between M L and these seismic moment M 0 in the single-logarithmic coordinates,a negative correlation between seismic moment and corner frequency,a non-significant correlation between seismic stress drop and seismic moment,and a significant double logarithmic relationship between source radius and stress drop.

关 键 词：遗传算法 场地相应 品质因子Q值 震源参数 江西地区 

分 类 号：P315[天文地球—地震学]