福建地区地震波非弹性衰减Q值、场地响应及震源参数研究
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摘要
利用Atkinson方法结合福建数字地震台网28个数字地震台记录的70个地震事件波形资料,对福建地区的非弹性衰减系数进行研究,得出福建地区介质平均Q值与频率f的关系式。利用Moya方法分别计算了福建台网"九五"和"十五"系统的台站场地响应,共获得37个地震台站的场地响应。最后根据Brune模型计算了2000年1月1日至2011年9月30日福建台网记录的省内及临近海域ML2.5以上157次地震的震源参数,这些地震ML震级与地震矩M0在单对数坐标下成线性关系,与震源尺度及应力降没有明显相关性。
Firstly,using 70 seismic events waveform recorded by 28 digital seismic stations in Fujian digital seismic network,we calculated the inelastic attenuation coefficient by Atkinson’s method and obtained the relationship between average Q-value and frequency in Fujian region.Secondly,we calculated site responses of stations in the "Ninth Five-years" and "Tenth Five-years"plans respectively in Fujian digital seismic network by Moya Method,and obtained site responses of 37 stations.Finally,according to Brune model,we calculated the source parameters of 157 ML≥2.5 earthquakes which is recorded by Fujian digital seismic network occurred in Fujian and its adjacent sea area from Jan.1,2000 to Sep.3,2011.There was a linear relationship between ML of these earthquakes and seismic moment M0 in the single-logarithmic coordinates,but there wasn’t evident correlation between ML and source scale,stress drop.
Firstly,using 70 seismic events waveform recorded by 28 digital seismic stations in Fujian digital seismic network,we calculated the inelastic attenuation coefficient by Atkinson’s method and obtained the relationship between average Q-value and frequency in Fujian region.Secondly,we calculated site responses of stations in the "Ninth Five-years" and "Tenth Five-years"plans respectively in Fujian digital seismic network by Moya Method,and obtained site responses of 37 stations.Finally,according to Brune model,we calculated the source parameters of 157 ML≥2.5 earthquakes which is recorded by Fujian digital seismic network occurred in Fujian and its adjacent sea area from Jan.1,2000 to Sep.3,2011.There was a linear relationship between ML of these earthquakes and seismic moment M0 in the single-logarithmic coordinates,but there wasn’t evident correlation between ML and source scale,stress drop.
引文
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Atkinson G M,Mereu R F.1992.The shape of ground motion attenuationcurves in Southeastern Canada[J].BSSA,82(5):2014-2031.
Brune J N.1970.Tectonic stress and the spectrum of seismic shear wavesfrom earthquakes[J].JGR,75(26):4997-5009.
Kanamori H.1977.The energy release in great earthquake[J].JGR,82(20):2981-2987.
Moya C A,Aguirre J.2000.Inversion of source parameters and site effectsfrom strong ground motion records using genetic algorithms[J].BSSA,90(4):977-992.
康英,吕金水,杨选,等.2010.广东新地震参数目录的编制[J].华南地震,30(增刊):19-27.
李祖宁,周峥嵘,林树,等.2005.利用数字地震台网资料联合反演福建地区Q值、场地响应和震源参数[J].地震地质,27(3):437-445.
王卫东,张永志,狄秀玲,等.2004.陕西省关中及邻区地震的震源参数研究[J].地震研究,27(4):330-333.
杨晶琼,杨周胜,刘丽芳,等.2010.2008年盈江5.9级地震序列震源参数研究[J].地震研究,33(4):308-312.
周连庆,赵翠萍,修济刚,等.2008.利用天然地震研究地壳Q值的方法和进展[J].国际地震动态,(2):1-7.
邹振轩.2006.应用Moya方法反演浙江地震震源参数和台站场地响应[J].东北地震研究,22(1):40-46.
Atkinson G M,Mereu R F.1992.The shape of ground motion attenuationcurves in Southeastern Canada[J].BSSA,82(5):2014-2031.
Brune J N.1970.Tectonic stress and the spectrum of seismic shear wavesfrom earthquakes[J].JGR,75(26):4997-5009.
Kanamori H.1977.The energy release in great earthquake[J].JGR,82(20):2981-2987.
Moya C A,Aguirre J.2000.Inversion of source parameters and site effectsfrom strong ground motion records using genetic algorithms[J].BSSA,90(4):977-992.
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