山西太原东山地震台附近地区地震尾波Q_c值变化特征研究
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摘要
采用Aki单次散射模型,用太原东山地震台记录到的ML2.0~5.0地震,计算得到Qc值随频率的变化结果。得出,随着尾波窗长增大,平均采样体深度增加,Q0值增大,η值减小。当尾波窗长取20 s时,Q0值为70.1,η值为1.03,是东山台附近地区最佳的研究结果。
Based on earthquakes of ML 2.0-5.0,recorded by Dongshan Seismic Station,Taiyuan,and Aki single dispersion model,Qc varied with frequency is calculated.The result shows that with the increasing of window width of coda wave,the average deepness of sampled body will increase,meanwhile,Q0 increases and η decreases.When the window width of coda wave is 20 s,Q0 is 70.1 and η is 1.03,which is the optimal research result for area around Dongshan Seismic Station,Shanxi.
Based on earthquakes of ML 2.0-5.0,recorded by Dongshan Seismic Station,Taiyuan,and Aki single dispersion model,Qc varied with frequency is calculated.The result shows that with the increasing of window width of coda wave,the average deepness of sampled body will increase,meanwhile,Q0 increases and η decreases.When the window width of coda wave is 20 s,Q0 is 70.1 and η is 1.03,which is the optimal research result for area around Dongshan Seismic Station,Shanxi.
引文
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[9]Pulli J.Attenuation of coda wave in New England[J].Bull Seis Soc Amer,1984,1 149-1 166.
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[12]钱晓东,李白基,秦嘉政.2001年云南施甸MS5.9地震余震序列尾波Qc值研究[J].地震地磁观测与研究,2004,25(1):9-17.
[13]吕坚,朱新运,高建华,等.江西九江—瑞昌震区的尾波衰减特征[J].地震,2006,26(4):15-21.
[2]Jin A,Aki K.Temporal change in Qc before the Tanshanearthquake of 1976 and the Haicheng earthquake of 1975[J].JCR,1986(91):665-673.
[3]Jin A,Aki K.Spatial and temporal correlation betweenand seismicity and its physical mechanism[J].JGR,1989(94):14 041-14 059.
[4]荣代潞,李亚荣,金铭.甘肃近期2次中强震前后震源区微震尾波Qc的变化特征[J].高源地震,2000,12(2):11-24.
[5]李白基,秦家政,钱晓东,等.云南姚安地区尾波衰减[J].地震学报,2004,26(1):47-52.
[6]王彩勤,郑斯华,刁桂苓,等.张北地震序列的尾波值研究[J].防震减灾工程学报,2004,24(1):37-40.
[7]Aki K,Chouet B.Origin of coda waves:source,attenuation and scattering effects[J].J Geophys Res,1975(80):3 322-3 342.
[8]朱新运,刘杰,张帆,等.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.
[9]Pulli J.Attenuation of coda wave in New England[J].Bull Seis Soc Amer,1984,1 149-1 166.
[10]刘明清,祝治平,方盛明,等.山西中南部地区地壳深部地球物理异常与地震[J].地震学报,1999,21(3):82-89.
[11]秦嘉政,李白基,钱晓东,等.云南武定地震余震近场尾波衰减的区域特征[J].地震学报,2001,23(1):87-97.
[12]钱晓东,李白基,秦嘉政.2001年云南施甸MS5.9地震余震序列尾波Qc值研究[J].地震地磁观测与研究,2004,25(1):9-17.
[13]吕坚,朱新运,高建华,等.江西九江—瑞昌震区的尾波衰减特征[J].地震,2006,26(4):15-21.
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