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湖北地区地震震源参数研究
申学林1,2, 魏贵春1,2, 丁文秀1,2, 戴苗1,2
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
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Qf)=501.8·f0.309;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lgM0=10.06+1.093ML;震源半径与应力降间呈双对数线性关系,即lg△σ=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。
关键词:  场地响应  品质因子  遗传算法  震源参数  湖北地区
DOI:
分类号:P315
基金项目: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
Study on the Source Parameters of the Hubei Region
Shen Xuelin1,2, Wei Guichun1,2, Ding Wenxiu1,2, Dai Miao1,2
1.Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, China;2.Hubei Earthquake Agency, Wuhan 430071, China
Abstract:
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·f0.309 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+1.093ML;focal radius and stress drop in double logarithmic linear relationship:lg△σ=10.52-2.01lgr,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.
Key words:  Site response  Quality factor  Genetic algorithm  Source parameter  Hubei area