2000年姚安M_S6.5地震震源及近邻区的低Q_S
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摘要
利用震源距23 km范围内观测的2000年姚安MS6.5地震余震记录,计算了震源及近邻区域的尾波规一直达S波在频率1.5~20 Hz之间的傅里叶谱振幅.结果显示谱振幅随震源距增大而增大,在对谱振幅进行了震源辐射方向性校正之后,才出现谱振幅随震源距衰减的现象.由此获得了震源及近邻区域S波的Q(f)值,可表示为QS(f)=8.9f0.98.其值比由尾波得出的姚安地区的平均QC(f)值低得多,表明了震源破裂带的强烈非均匀性对QS(f)的重大影响.
The Fourier coda normalized spectral amplitudes in the frequency range of 1.5 to 20Hz of the direct S waves were calculated using the aftershock recordings observed within hypocentral distance 23 km in the source and adjacent area of the 2000 Yao'an M-S6.5 earthquake.The spectral amplitude strengthens with the increase of hypocentral distance,rather than weakens.After correction for the effect of source radiation directivity on the spectral amplitudes,the phenomenon of attenuation with increasing hypocentral distance appears then.The Q(f) of the shear waves in the source and adjacent area is obtained therefrom.It is expressed as Q-S(f)=8.9f~(0.98).Its value is significantly lower than Q-C(f) for the Yao'an region calculated from the 30-second-elapse-time S-wave coda.It shows the serious effect of strong heterogeneity of the earthquake rupture zone on Q-S(f).
The Fourier coda normalized spectral amplitudes in the frequency range of 1.5 to 20Hz of the direct S waves were calculated using the aftershock recordings observed within hypocentral distance 23 km in the source and adjacent area of the 2000 Yao'an M-S6.5 earthquake.The spectral amplitude strengthens with the increase of hypocentral distance,rather than weakens.After correction for the effect of source radiation directivity on the spectral amplitudes,the phenomenon of attenuation with increasing hypocentral distance appears then.The Q(f) of the shear waves in the source and adjacent area is obtained therefrom.It is expressed as Q-S(f)=8.9f~(0.98).Its value is significantly lower than Q-C(f) for the Yao'an region calculated from the 30-second-elapse-time S-wave coda.It shows the serious effect of strong heterogeneity of the earthquake rupture zone on Q-S(f).
引文
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[2]刘建华,刘福田,王凤霞等.单台Lg尾波QcLg的测量研究.地球物理学报,1999,42(3):371~382Liu J H,Liu F T,Wang F X,et al.A measurement study for singletrace Lg codaQcLg.Chinese J.Geophys.(in Chinese),1999,42(3):371~382
[3]刘建华,刘福田,阎晓蔚等.华北地区Lg尾波衰减研究-Lg尾波Q的测量.地球物理学报,2004,47(5):822~831Liu J H,Liu F T,Yan X W,et al.A study of Lg coda attenuation inNorth China-The measurement of Lg codaQ.Chinese J.Geophys.(in Chinese),2004,47(5):822~831
[4]胡家富,从连理,苏有锦等.云南及周边地区Lg尾波Q值的分布特征.地球物理学报,2003,46(6):809~813Hu J F,Cong L L,Su Y J,et al.Distribution characteristics ofQvalue of the Lg coda in Yunnan and its adjacent regions.Chinese J.Geophys.(in Chinese),2003,46(6):809~813
[5]靳平,肖卫国,段克敏等.由Lg波振幅谱估算地震矩及Lg波Q值.地震学报,2004,26(增刊):21~30Jin P,Xiao W G,Duan K M,et al.Estimating seismic moments andQLgusing Lg spectra.Acta Seismologica Sinica(in Chinese),2004,26(Suppl.):21~30
[6]黄玉龙,郑斯华,刘杰等.广东地区地震动衰减和场地响应研究.地球物理学报,2003,46(1):54~61Wong Y L,Zheng S H,Liu J,et al.Attenuation of ground motion andsite response in Guangdong region.Chinese J.Geophys.(inChinese),2003,46(1):54~61
[7]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.地震学报,2004,26(4):369~378Chuo Y Q,Su Y,Jia J X,et al.Study on inelastic attenuationcoefficient,site response and source parameters in Shanxi region.ActaSeismologica Sinica,2004,17(4):405~416
[8]刘红桂,啜永清,陈书清等.鄂尔多斯地块地壳内S波衰减特征的研究.地震学报,2005,27(5):488~497Liu H G,Chuo Y Q,Chen S Q,et al.Attenuation of S waves in thecrust of Ordos massif.Acta Seismologica Sinica(in Chinese),2005,27(5):488~497
[9]Mamada Y,Takenaka H.Strong attenuation of shear waves in the focalregion of the 1997 Northwestern Kagoshima earthquakes,Japan.Bull.Seism.Soc.Am.,2004,94:464~478
[10]Matsunami K,Nakamura M.Seismic attenuation in a nonvolcanicswarm region beneath Wakayama,southwest Japan.J.Geophys.Res.,2004,109(B9):B09302
[11]Aki K.Analysis of the seismic coda of local earthquakes as scatteredwaves.J.Geophys.Res.,1969,74:615~631
[12]Rautian T G,Khalturin V I.The use of the coda for determination ofearthquake source spectrum.Bull.Seism.Soc.Am.,1978,68:923~948
[13]Aki K.Attenuation of shear-waves in the lithosphere for frequenciesfrom 0.05 to 25 Hz.Phys.Earth Plant.Interiors,1980,21:50~60
[14]Herrmann R B.Qestimates using the coda of local earthquakes.Bull.Seism.Soc.Am.,1980,70:447~468
[15]Aki K,Chouet B.Qrigin of coda waves:Source,attenuation andscattering effects.J.Geophys.Res.,1975,80:3322~3342
[16]Aki K.Attenuation of shear waves in the lithosphere for frequenciesfrom 0.025 to 25 Hz.Phys.Earth Planet.Interiors.,1980,21:50~60
[17]叶建庆.近场流动数字地震台网监测.见:毛玉平编.2000年云南姚安6.5级地震.昆明:云南科技出版社,2001.55~84Ye J Q.Nearing observation of mobile digital seismic instrument.In:Mao Y P ed.2000 Yaoan,Yunnan,M6.5 Earthquake(in Chinese).Kunming:Yunnan Science and Technology Press,2001.55~84
[18]胡鸿翔,陆函行,王椿镛等.滇西地区地壳结构的爆破地震研究.地球物理学报,1986,29(2):133~144Hu H X,Lu H X,Wang C Y,et al.Explosion investigation of thecrustal structure in western Yunnan Province.Chinese J.Geophys.(in Chinese),1986,29(2):133~144
[19]Ordaz M,Singh S K.Source spectra attenuation of seismic waves fromMexican earthquakes and evidence of amplification in the hill zone ofMexico City.Bull.Seism.Soc.Am.,1992,82(1):24~43
[20]Aki K,Richards G.Quantitative Seismology:Theory and Methods.New York:W H Freeman and Company,1980
[21]李白基,秦嘉政,钱晓东等.云南姚安地区的尾波衰减.地震学报,2004,26(1):47~52Li B J,Qin J Z,,Qian X D,et al.The coda attenuation of the Yao’anarea in Yunnan Province.Acta Seismologica Sinica,2004,17(1):47~53
[22]李白基,秦嘉政,叶建庆等.永胜期纳上地壳的地震波QP和QC.见:张忠杰主编.中国大陆地球深部结构与动力学研究.北京:科学出版社,2004.448~453Li B J,Qin J Z,Ye J Q,et al.Seismic waveQPandQCin the uppercrust of Qina,Yongsheng.In:Zhang Z J ed.The Studies of Earth DeepStructure and Dynamics in Mainland of China(in Chinese).Beijing:Science Press,2004.448~453
[23]王洋龙.滇中块体构造与地震.见:毛玉平编.2000年云南姚安6.5级地震.昆明:云南科技出版社,2001.189~209Wang Y L.Tectonics of central Yunnan block and earthquakes.In:Mao Y P ed.2000 Yaoan,Yunnan,M6.5 Earthquake(in Chinese).Kunming:Yunnan Science and Technology Press,2001.189~209
[24]Singh S K,Apsel R J,Fried J.Spectral attenuation of SH waves alongthe Imperial fault.Bull.Seism.Soc.Am.,1982,72:2003~2016
[25]Bindi D,Parolai S,Grosser H,et al.Crustal attenuation characteristicsin northwestern Turkey in the range from 1 to 10 Hz.Bull.Seism.Soc.Am.,2006,96(1):200~214
[26]Li Y G,Vidale J E,Day S M,et al.Study of the 1999M7.1 HectorMine,California,earthquake fault plane by trapped waves.Bull.Seism.Soc.Am.,2002,92(4):1318~1332
[27]Li Y G,Aki K,Vidale J E,et al.A delineation of the Nojima faultruptured in theM7.2 Kobe,Japan,earthquake of 1995 using faultzone trapped waves.J.Geophys.Res.,1998,103:7247~7263
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