2008年盈江5.9级地震序列震源参数研究
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摘要
2008年8月21日在云南省盈江县发生了MS5.9地震。利用云南区域数字地震台网记录的ML≥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ML≥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1012～1016N.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。
Yingjiang MS5.9 earthquake On August 21,2008 occurred in Yunnan.Using waveforms of the ML≥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 ML≥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 ML,M0 and rupture radius r.Δσ seems dependent on ML;fc increases with M0 decreasing according to the lgfc-M0 relation.
Yingjiang MS5.9 earthquake On August 21,2008 occurred in Yunnan.Using waveforms of the ML≥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 ML≥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 ML,M0 and rupture radius r.Δσ seems dependent on ML;fc increases with M0 decreasing according to the lgfc-M0 relation.
引文
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邬成栋,付虹,赵小艳.2010.小湾水库近场区地震震源参数初步研究[J].地震研究,33(1):50-54.
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Ba kun W H.1984.Seismic moments,local magnitudes,and coda-dura-tion magnitudes for earthquakes in central California[J].BSSA,74:439-458.
Bru ne J N.1970.ectonic stress and the spectra of seismic shear wavesfrom earthquake[J].J Geophys Res,75(26):4997-5009.
Mo ya C A,Aguirre J,Irikura K.2000.Inversion of source parameters andsite effects from strong ground motion records using genetic algo-rithms[J].BSSA,90(4):977-992.
李立平.1990.澜沧—耿马地震震源动力学参数研究[J].地震研究,13(3):223-232.
李一正.1985.滇西地区震级与地震矩标度[J].地震研究,8(6):617-632.
刘丽芳,刘杰,苏有锦.2006.姚安地震序列与大姚地震序列震源参数的对比研究[J].地震,26(1):10-18.
邬成栋,付虹,赵小艳.2010.小湾水库近场区地震震源参数初步研究[J].地震研究,33(1):50-54.
赵翠萍,夏爱国,郑斯华,等.2005.新疆北天山中东段地区震源参数研究[J].中国地震,21(1):61-69.
中国地震局监测预报司.2005.华北地区强地震短期前兆特征与预测方法研究[M].北京:地震出版社.
Atk inson G M,Mereu R F.1992.The shape of ground motion attenuationcurves in southeastern Canada[J].BSSA,82:2014-2031.
Ba kun W H.1984.Seismic moments,local magnitudes,and coda-dura-tion magnitudes for earthquakes in central California[J].BSSA,74:439-458.
Bru ne J N.1970.ectonic stress and the spectra of seismic shear wavesfrom earthquake[J].J Geophys Res,75(26):4997-5009.
Mo ya C A,Aguirre J,Irikura K.2000.Inversion of source parameters andsite effects from strong ground motion records using genetic algo-rithms[J].BSSA,90(4):977-992.
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