山西地区非弹性衰减系数、场地响应和震源参数的初步研究
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摘要
利用山西数字测震台网"十五"数字化之后34次ML2.5～ML5.2级地震波形资料,采用Atkinson方法反演出非弹性衰减Q值随频率f的关系为Q(f)=469.5 f0.3141;采用Moya方法反演得出41个台站的场地响应,结果显示出仪器安置在山洞且地处外界干扰小的台站没有明显的放大效应,而其它台站尽管都是基岩台,均存在不同程度的放大效应。根据Brune方法计算出这些地震的震源参数,进而分析了ML震级与地震矩、应力降、矩震级之间的相互关系。
Based on waveform data of 34 ML2.5~ML5.2 earthquakes from Shanxi digital seismic network,the relationship between inelastic attenuation Q value and frequency f are inversed using Atkinson method,which is Q(f)=469.5 f0.3141;Site response of 41 seismic stations are calculated through the Moya method.The results shows that stations installed in cave do not show obvious site amplification effect,all the other stations,although installed on bedrock,show site amplification effect in varying degree.Source parameters of the 34 earthquakes are calculated using Brune method;Relationships between ML magnitude and seismic moment,ML magnitude and stress drop,ML magnitude and moment magnitude are also studied.
Based on waveform data of 34 ML2.5~ML5.2 earthquakes from Shanxi digital seismic network,the relationship between inelastic attenuation Q value and frequency f are inversed using Atkinson method,which is Q(f)=469.5 f0.3141;Site response of 41 seismic stations are calculated through the Moya method.The results shows that stations installed in cave do not show obvious site amplification effect,all the other stations,although installed on bedrock,show site amplification effect in varying degree.Source parameters of the 34 earthquakes are calculated using Brune method;Relationships between ML magnitude and seismic moment,ML magnitude and stress drop,ML magnitude and moment magnitude are also studied.
引文
[1]华卫,陈章立,郑斯华.汶川8.0级地震触发与余震活动空间分布研究[J].地震,2009,29(1):33-39.
[2]Atkinson G M,Mereu R F.The shape of ground motion attenuation curves in Southeastern Canda[J].Bull.Seism.Soc.Amer.,1992,82(5):2014-2031.
[3]华卫,陈章立,郑斯华.2008年汶川8.0级地震序列震源参数分段特征的研究[J].地球物理学报,2009,52(2):365-371.
[4]丁风和,高立新.用遗传算法反演内蒙古中西部地区的Q值和场地响应[J].华北地震科学,2008,23(1):22-26.
[5]刘杰,郑斯华,黄玉龙.利用遗传算法反演非弹性衰减系数、震源参数和场地响应[J].地震学报,2003,25(2):211-218.
[6]华卫,陈章立,郑斯华.三峡水库地区震源参数特征研究[J].地震地质,2010,32(4):533-542.
[7]Moya C A,Aguirre J,Irikura K.Inversion of source parameters and site effects form strong ground motion records[J].Bull.Seism.Soc.Amer.,2000,90(4):977-992.
[8]季爱东,周彦文,吴丹彤,等.山东中西部及邻近地区震源参数和场地响应的反演[J].华北地震科学,2008,26(3):31-35.
[9]华卫,陈章立,郑斯华.利用不同方法估算流动台站的场地响应[J].地震,2010,30(3):30-44.
[10]张玲,梁向军,董春丽,等.山西地震台网监控能力分析[J].山西地震,2010,4:11-16.
[11]啜永清,苏燕,贾建喜,等.山西地区非弹性衰减系数、场地响应和几种震源参数的研究[J].地震学报,26(7):369-378.
[12]Brune J N.Tectonic stress and the spectra of seismic waves from earthquakes[J].J.Geophys.Res.,1970,75:4997-5009.
[13]Stork A L,Ito H.Source Parameter Scaling for Small Earthquakes Observed at the Western Nagano800-m-Deep Borehole,Central Ja-pan[J].Bull.Seism.Soc.Amer.,2004,94(5):1781-1794.
[14]Kanamori H.The energy release in great earthquakes[J].J.Geophys.Res.,1977,82:2981-2987.
[15]Hanks T C,Kanamori H.A moment magnitude scale[J].J.Geophys.Res.,1979,84(B5):2348-2350.
[16]赵翠萍,夏爱国,郑斯华,等.新疆北天山中东段地区震源参数研究[J].中国地震,2005,21(1):61-69.
[2]Atkinson G M,Mereu R F.The shape of ground motion attenuation curves in Southeastern Canda[J].Bull.Seism.Soc.Amer.,1992,82(5):2014-2031.
[3]华卫,陈章立,郑斯华.2008年汶川8.0级地震序列震源参数分段特征的研究[J].地球物理学报,2009,52(2):365-371.
[4]丁风和,高立新.用遗传算法反演内蒙古中西部地区的Q值和场地响应[J].华北地震科学,2008,23(1):22-26.
[5]刘杰,郑斯华,黄玉龙.利用遗传算法反演非弹性衰减系数、震源参数和场地响应[J].地震学报,2003,25(2):211-218.
[6]华卫,陈章立,郑斯华.三峡水库地区震源参数特征研究[J].地震地质,2010,32(4):533-542.
[7]Moya C A,Aguirre J,Irikura K.Inversion of source parameters and site effects form strong ground motion records[J].Bull.Seism.Soc.Amer.,2000,90(4):977-992.
[8]季爱东,周彦文,吴丹彤,等.山东中西部及邻近地区震源参数和场地响应的反演[J].华北地震科学,2008,26(3):31-35.
[9]华卫,陈章立,郑斯华.利用不同方法估算流动台站的场地响应[J].地震,2010,30(3):30-44.
[10]张玲,梁向军,董春丽,等.山西地震台网监控能力分析[J].山西地震,2010,4:11-16.
[11]啜永清,苏燕,贾建喜,等.山西地区非弹性衰减系数、场地响应和几种震源参数的研究[J].地震学报,26(7):369-378.
[12]Brune J N.Tectonic stress and the spectra of seismic waves from earthquakes[J].J.Geophys.Res.,1970,75:4997-5009.
[13]Stork A L,Ito H.Source Parameter Scaling for Small Earthquakes Observed at the Western Nagano800-m-Deep Borehole,Central Ja-pan[J].Bull.Seism.Soc.Amer.,2004,94(5):1781-1794.
[14]Kanamori H.The energy release in great earthquakes[J].J.Geophys.Res.,1977,82:2981-2987.
[15]Hanks T C,Kanamori H.A moment magnitude scale[J].J.Geophys.Res.,1979,84(B5):2348-2350.
[16]赵翠萍,夏爱国,郑斯华,等.新疆北天山中东段地区震源参数研究[J].中国地震,2005,21(1):61-69.
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