利用Aki模型对宁夏及邻区尾波Q值的研究
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摘要
利用单次散射的Aki模型,选取2008年1月-2009年12月宁夏地震台网记录的82次ML≥2.0地震的数字地震波资料,计算宁夏及邻区尾波Q值,拟合Q值对频率的依赖关系。全区域数据结果为Q(f)=(212±87.62).f0.7584±0.19。与国内其它区域相比,本区域Q值较低、对频率依赖性较高。结合区域地震地质构造特征及同期地震活动性将研究区划分为四个小震密集区:吉兰泰地震区、银川地震区、卫宁同地震区和固海地震区,分区对Q值进行数据统计,对比表明,尾波Q值较好地反映了小区地震活动特征。
Based on the Aki model,adopting 82 digital wave datas of earthquake with ML≥2.0 from January,2008 to December,2009,which were recorded by Ningxia earthquake network,the average Q values of seismic coda in Ningxia and adjacent region are calculated,and the relationship between Q value and frequency is polyfited.The whole region's result is Q(f)=(212±87.62)·f0.7584±0.19.Compared with other domestic regions,the Q value of seismic coda is relatively lower,but the dependence on frequency is higher.According to the regional seismic geology,tectonic characteristics and the homochronous seismic activity,the research region is divided into four concentrated minor-earthquake areas: Ji Lantai,Yin Chuan,Wei Ningtong and Gu Hai,and the Q values of four regions are counted.Comparison shows that Q values of seismic coda reflects the characteristics of seismicity in each area.
Based on the Aki model,adopting 82 digital wave datas of earthquake with ML≥2.0 from January,2008 to December,2009,which were recorded by Ningxia earthquake network,the average Q values of seismic coda in Ningxia and adjacent region are calculated,and the relationship between Q value and frequency is polyfited.The whole region's result is Q(f)=(212±87.62)·f0.7584±0.19.Compared with other domestic regions,the Q value of seismic coda is relatively lower,but the dependence on frequency is higher.According to the regional seismic geology,tectonic characteristics and the homochronous seismic activity,the research region is divided into four concentrated minor-earthquake areas: Ji Lantai,Yin Chuan,Wei Ningtong and Gu Hai,and the Q values of four regions are counted.Comparison shows that Q values of seismic coda reflects the characteristics of seismicity in each area.
引文
[1]Aki K.Analysis of seismic coda of local earthquakes as scat-tered wave[J].J.Geophys.Res.,1969,74:615-631.
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[3]朱新运.影响尾波Q值数据结果的算法因素分析[J].东北地震研究,2006,22(4):8-13.
[4]Rautain T G,Khalturin V I.The use of the coda for determi-nation of earthquake source spectrum[J].Bull.Seis.Soc.A-mer.,1978,75:1371-1382.
[5]朱新运,张帆.浙江及邻区尾波Q值研究[J].西北地震学报,2006,28(2):108-113.
[6]朱新运,刘杰,张帆.基于Aki模型的近震S波尾波Q值求解及分析软件研制[J].地震研究,2006,29(1):76-80.
[7]杨明芝,马禾青,廖玉华.宁夏地震活动与研究[M].北京:地震出版社,2007.
[8]马云生,张天中,张焕生.北京及其周围地区尾波Q值分布特征的研究[J].地震学报,1995,17(4):448-458.
[9]王培玲,孙洪斌,陈玉华.青海玉树单台地震序列的尾波Q值研究[J].高原地震,2007,19(3):21-24.
[10]梁劳,林美,江秋云.粤西地区的地震尾波Q值和尾波衰减特征[J].华南地震,1989,9(2):1-13.
[11]陈俊华,甘家思.九江-瑞昌5.7级地震余震尾波QC值分析[J].大地测量与地球动力学,2006,26(3):65-68.
[12]吕坚,朱新运,高建华,等.江西九江-瑞昌震区的尾波衰减特征初探[J].地震,2006,26(4):15-21.
[13]赵卫明,刘秀景,马禾青.宁夏及邻区尾波Q值分布特征[J].华南地震,2002,22(1):23-27.
[2]Aki K,Chouet B.Origin of Coda wave:source,attenuationand sattering effects[J].J.Geophys.Res.,1975,80:3322-3342.
[3]朱新运.影响尾波Q值数据结果的算法因素分析[J].东北地震研究,2006,22(4):8-13.
[4]Rautain T G,Khalturin V I.The use of the coda for determi-nation of earthquake source spectrum[J].Bull.Seis.Soc.A-mer.,1978,75:1371-1382.
[5]朱新运,张帆.浙江及邻区尾波Q值研究[J].西北地震学报,2006,28(2):108-113.
[6]朱新运,刘杰,张帆.基于Aki模型的近震S波尾波Q值求解及分析软件研制[J].地震研究,2006,29(1):76-80.
[7]杨明芝,马禾青,廖玉华.宁夏地震活动与研究[M].北京:地震出版社,2007.
[8]马云生,张天中,张焕生.北京及其周围地区尾波Q值分布特征的研究[J].地震学报,1995,17(4):448-458.
[9]王培玲,孙洪斌,陈玉华.青海玉树单台地震序列的尾波Q值研究[J].高原地震,2007,19(3):21-24.
[10]梁劳,林美,江秋云.粤西地区的地震尾波Q值和尾波衰减特征[J].华南地震,1989,9(2):1-13.
[11]陈俊华,甘家思.九江-瑞昌5.7级地震余震尾波QC值分析[J].大地测量与地球动力学,2006,26(3):65-68.
[12]吕坚,朱新运,高建华,等.江西九江-瑞昌震区的尾波衰减特征初探[J].地震,2006,26(4):15-21.
[13]赵卫明,刘秀景,马禾青.宁夏及邻区尾波Q值分布特征[J].华南地震,2002,22(1):23-27.
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