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| 湖北地区地震震源参数研究 |
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申学林1,2, 魏贵春1,2, 丁文秀1,2, 戴苗1,2
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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
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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·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 |
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| Study on the Source Parameters of the Hubei Region |
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Shen Xuelin1,2, Wei Guichun1,2, Ding Wenxiu1,2, Dai Miao1,2
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1.Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, China;2.Hubei Earthquake Agency, Wuhan 430071, China
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| 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 |
