湖北地区地震震源参数研究  

Study on the Source Parameters of the Hubei Region

作　　者：申学林[1,2] 魏贵春 丁文秀[1,2] 戴苗 Shen Xuelin;Wei Guichun;Ding Wenxiu;Dai Miao(Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,Wuhan 430071,China;Hubei Earthquake Agency,Wuhan 430071,China)

机构地区：[1]中国地震局地震研究所中国地震局地震大地测量重点实验室,武汉市武昌区洪山侧路40号430071 [2]湖北省地震局,武汉市武昌区洪山侧路40号430071

出　　处：《中国地震》2018年第4期781-787,共7页Earthquake Research in China

基　　金：中国地震局地震研究所所长基金(IS201526232);测震台网青年骨干培养专项(20150418)共同资助

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 : lgM0=10.06+1.093 ML;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.

关 键 词：场地响应 品质因子 遗传算法 震源参数 湖北地区 

分 类 号：P315[天文地球—地震学]