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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

33

期数:

2010年04期

页码:

308-312

栏目:

出版日期:

2010-04-23

文章信息/Info

Title:

Study on the Source Parameters of the Yingjiang M_S5.9 Earthquake Sequence in 2008

作者:

杨晶琼; 杨周胜; 刘丽芳; 苏有锦; 张 森

(云南省地震局,昆明 650224)

Author(s):

YANG Jing-qiong; YANG Zhou-sheng; LIU Li-fang; SU You-jing; ZHANG Sen

(Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)

关键词:

震源参数;  遗传算法;  震源谱;  地震序列;  盈江5.9级地震

Keywords:

source parameters; genetic algorithm; source spectra; earthquake sequence; Yingjiang M_S 5.9 earthquake

分类号:

P315.6

DOI:

-

摘要:

2008年8月21日在云南省盈江县发生了M_S5.9地震。利用云南区域数字地震台网记录的M_L≥2.5余震波形记录,通过对S波观测记录谱进行传播路径、场地响应和仪器响应等影响的逐一消除,得到了196个M_L≥2.5地震的震源谱,进而根据Brune圆盘震源模型,利用遗传算法计算了地震矩、应力降、震源半径等震源参数,结果表明,该地震序列的地震矩在10¹²～10¹⁶ N·m间,与近震震级有很好的线性关系,与震源半径也呈线性关系; 应力降与近震震级有一定的线性趋势相关性; 拐角频率和地震矩之间有明显的依赖关系。

Abstract:

Yingjiang M_S5.9 earthquake On August 21,2008 occurred in Yunnan.Using waveforms of the M_L≥2.5 earthquakes recorded by Yunnan Regional Digital Network.By removing propagation,site and instrument effects from the displacement spectra of the S-wave recordings,we obtain the source parameters of 196 M_L≥2.5 earthquakes based on the Brune disc model and Genetic algorithm,namely,the seismic moment M₀,stress drop Δσ and rupture radius r.The results show that there is a good linear relation between M₀(10¹²～10¹⁶ N·m)and local magnitude M_L,M₀ and rupture radius r.Δσ seems dependent on M_L; f_c increases with M₀ decreasing according to the lgf_c-M₀ relation.

参考文献/References:

-

备注/Memo

备注/Memo:

收稿日期:2009-11-09
基金项目:地震行业科研专项(200708026)资助.

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更新日期/Last Update: 2010-04-23