安徽地区震源参数特征研究
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摘要
根据安徽数字测震台网记录的23个地震波形事件,首先采用Atkinson方法得到安徽地区的非弹性衰减特征,再用Moya方法得到24个台站的场地响应。在此基础上,扣除传播路径、场地响应和仪器响应的影响,利用遗传算法得到2009年以来安徽测震台网记录的42个ML≥2.0地震的震源参数,并对这些震源参数特征进行了系统的分析与研究。研究结果表明,安徽地区地震的地震矩与近震震级之间存在较好的线性关系,近震震级与矩震级存在一定的偏差,应力降与近震震级存在明显的正相关,震级越大,拐角频率越小,震源破裂半径越大。
According to 23 seismic waveforms recorded by Anhui digital earthquake network,they got inelastic attenuation through Atkinson method and site response from 24 stations through Moya method.Removing effect of propagation path、site response and instrument response,they got 42 source parameters of earthquakes with ML≥2.0 recorded by Anhui earthquake network since 2009 using genetic algorithms method and made a systematic analysis on characteristics of it.The results show that:there is a good linear relationship between earthquake moment and local magnitude in Anhui;there is a certain bias between the local magnitude and moment magnitude;there is a clear positive correlation between stress drop and local magnitude;the larger the magnitude is,the smaller the corner frequency is and the greater the radius of rupture is.
According to 23 seismic waveforms recorded by Anhui digital earthquake network,they got inelastic attenuation through Atkinson method and site response from 24 stations through Moya method.Removing effect of propagation path、site response and instrument response,they got 42 source parameters of earthquakes with ML≥2.0 recorded by Anhui earthquake network since 2009 using genetic algorithms method and made a systematic analysis on characteristics of it.The results show that:there is a good linear relationship between earthquake moment and local magnitude in Anhui;there is a certain bias between the local magnitude and moment magnitude;there is a clear positive correlation between stress drop and local magnitude;the larger the magnitude is,the smaller the corner frequency is and the greater the radius of rupture is.
引文
[1]赵翠萍,陈章立,华卫,等.中国大陆主要活动区中小地震震源参数研究[J].地球物理学报,2011,54:(6):1478-1489.
[2]陈继峰.甘肃地区震源参数的相关性研究[J].地震地磁观测与研究,2011,32(1):10-14.
[3]华卫,陈章立,郑斯华,等.三峡水库地区震源参数特征研究[J].地震地质,2010,32(4):533-542.
[4]Moya A,Jorge A.Inversion of Source parameters and site effects from strong ground motion record using genetic algorithms[J].Bull.Seism.Soc.Am.,2000,90:977-992.
[5]Atkinson G M,Mereu R F.The shape of ground attenuation curves in Southeastern Canada[J].Bull.Seism.Soc.Am.,1992,82:2 014-2 031.
[6]Brune J N.Tectonic stress and the spectrum of seismic shear waver from earthquakes[J].J.Geophys.Res,1970,75(26):4 997-5 009.
[7]啜永清,苏燕,贾建喜,等.山西地区非弹性衰减、场地响应和几种震源参数的研究[J].地震学报,2004,26(4):369-378.
[8]邬成栋,付虹,赵小艳,等.小湾水库近场区地震震源参数初步研究[J].地震研究,2010,33(1):50-54.
[9]潘振生,刘辉,谷美菊,等.新疆柯坪块体震源参数的初步研究与应用[J].西北地震学报,2010,32(4):357-410.
[10]于俊宜.浙江皎口水库地震震源参数研究[J].地震地磁观测与研究,2011,32(2):19-24.
[11]张永久,乔慧珍.紫坪铺水库库区震源波谱参数研究[J].西北地震学报,2011,33(2):117-122.
[12]刘丽芳,苏有锦,刘杰,等.云南和四川中小地震应力降特征研究[J].地震研究,2010,33(3):314-319.
[13]Abercrombie R E.Earthquake source scaling relationships from 1 to 5 ML using seismograms recorded at 2.5 km depth[J].J.Geophys.Res.,1995,100:24 015-24 036.
[14]Allmannl B P,Shearer P M.Spatial and temporal stress drop Variations in small earthquakes near Parkfield,California[J].J.Geophys.Res,2007,112,B04305,doi:10.1029/2006JB004395.
[15]Hardebeck J L,Allegra A.Earthquake stress drop and inferred fault strength on the Hayward fault,East San Francisco Bay,Cali-fornia[J].Bull.Seism.Soc.Am,2009,99(3):1 801-1 814.
[16]Mayeda K,Walter W R.Moment,energy,stress drop,and source spectra of western United States earthquake from regional codaenvelopes[J].J.Geophys.Res,1996,101:11 195-11 208.
[17]Mori J,Abercrombie R E,Kanamori H.Stress drops and rediated energies of the Northridge aftershocks[J].J.Geophys.Res.,2003,108,10.1029/200JB000474.
[18]Tusa G,Gresta S.Frequency dependent atenuation of P waves and estimation of earthquake.Source Parameters in SoutheasternSicily,Italy,Bull[J].Seism.Soc.Am,2008,98(6):2 772-2 794.
[19]师海阔,朱新运,贺永忠,等.宁夏及邻区地震震源参数研究[J].大地测量与地球动力学,2010,30(1):38-43.
[2]陈继峰.甘肃地区震源参数的相关性研究[J].地震地磁观测与研究,2011,32(1):10-14.
[3]华卫,陈章立,郑斯华,等.三峡水库地区震源参数特征研究[J].地震地质,2010,32(4):533-542.
[4]Moya A,Jorge A.Inversion of Source parameters and site effects from strong ground motion record using genetic algorithms[J].Bull.Seism.Soc.Am.,2000,90:977-992.
[5]Atkinson G M,Mereu R F.The shape of ground attenuation curves in Southeastern Canada[J].Bull.Seism.Soc.Am.,1992,82:2 014-2 031.
[6]Brune J N.Tectonic stress and the spectrum of seismic shear waver from earthquakes[J].J.Geophys.Res,1970,75(26):4 997-5 009.
[7]啜永清,苏燕,贾建喜,等.山西地区非弹性衰减、场地响应和几种震源参数的研究[J].地震学报,2004,26(4):369-378.
[8]邬成栋,付虹,赵小艳,等.小湾水库近场区地震震源参数初步研究[J].地震研究,2010,33(1):50-54.
[9]潘振生,刘辉,谷美菊,等.新疆柯坪块体震源参数的初步研究与应用[J].西北地震学报,2010,32(4):357-410.
[10]于俊宜.浙江皎口水库地震震源参数研究[J].地震地磁观测与研究,2011,32(2):19-24.
[11]张永久,乔慧珍.紫坪铺水库库区震源波谱参数研究[J].西北地震学报,2011,33(2):117-122.
[12]刘丽芳,苏有锦,刘杰,等.云南和四川中小地震应力降特征研究[J].地震研究,2010,33(3):314-319.
[13]Abercrombie R E.Earthquake source scaling relationships from 1 to 5 ML using seismograms recorded at 2.5 km depth[J].J.Geophys.Res.,1995,100:24 015-24 036.
[14]Allmannl B P,Shearer P M.Spatial and temporal stress drop Variations in small earthquakes near Parkfield,California[J].J.Geophys.Res,2007,112,B04305,doi:10.1029/2006JB004395.
[15]Hardebeck J L,Allegra A.Earthquake stress drop and inferred fault strength on the Hayward fault,East San Francisco Bay,Cali-fornia[J].Bull.Seism.Soc.Am,2009,99(3):1 801-1 814.
[16]Mayeda K,Walter W R.Moment,energy,stress drop,and source spectra of western United States earthquake from regional codaenvelopes[J].J.Geophys.Res,1996,101:11 195-11 208.
[17]Mori J,Abercrombie R E,Kanamori H.Stress drops and rediated energies of the Northridge aftershocks[J].J.Geophys.Res.,2003,108,10.1029/200JB000474.
[18]Tusa G,Gresta S.Frequency dependent atenuation of P waves and estimation of earthquake.Source Parameters in SoutheasternSicily,Italy,Bull[J].Seism.Soc.Am,2008,98(6):2 772-2 794.
[19]师海阔,朱新运,贺永忠,等.宁夏及邻区地震震源参数研究[J].大地测量与地球动力学,2010,30(1):38-43.
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