紫坪铺水库地区尾波Q_C值研究
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摘要
利用Sato模型研究了汶川MS8.0地震前位于震源区的紫坪铺水库地区尾波QC值特征。结果表明,库区QC值与频率有很强的依赖关系,4个台站的平均QC=21.6f1.211,尾波Q0值较小,平均为21.6。离震群最近的MZP台Q0最大,为29.0,离震群最远的BAJ台Q0最小,为13.9。这种尾波Q0值的差别可能与尾波Q值所反映的介质深度存在一定的关系,而较小的流逝时间可能是这里η值偏高的原因之一。
Using Sato model,this article studied the characteristics of coda wave Q values varied with time near the Zipingpu reservoir located at the hypocenter region of the 2008 Wenchuan MS8.0 earthquake.The results show that Q0 of coda waves recorded by the 4 stations near the Zipingpu reservoir is relatively small and η is relatively big.Q0 of the MZP station which is the nearest station to the earthquake swarm is the biggest,and has a value of 29.0.On the other hand,Q0 of the BAJ station which is the farthest station to the earthquake swarm is the smallest,and has a value of only 13.9.The difference of Q0 can be attributed to the medium′s depth reflected by the coda wave Q values and small elapse time could be one of the reason for the relatively big η value.
Using Sato model,this article studied the characteristics of coda wave Q values varied with time near the Zipingpu reservoir located at the hypocenter region of the 2008 Wenchuan MS8.0 earthquake.The results show that Q0 of coda waves recorded by the 4 stations near the Zipingpu reservoir is relatively small and η is relatively big.Q0 of the MZP station which is the nearest station to the earthquake swarm is the biggest,and has a value of 29.0.On the other hand,Q0 of the BAJ station which is the farthest station to the earthquake swarm is the smallest,and has a value of only 13.9.The difference of Q0 can be attributed to the medium′s depth reflected by the coda wave Q values and small elapse time could be one of the reason for the relatively big η value.
引文
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[3]A J,K A.Spatial and Temporal Correlation Between CodaQ-1and Seismicity and Its PhysicalMechanism[J].J Geodynamics,1993,17:95-120.
[4]Sato H.Energy propagation including scattering effects:Single isotropic scattering approximation[J].J Geophy Earth,1977,25:27-41.
[5]胡先明,谢蓉华.紫坪铺水库地震台网记录地震的复杂性[J].四川地震,2006(2):17-20.
[6]张培震,徐锡伟,闻学泽,等.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,2008,51(4):1 066-1 073.
[7]Aki K.Analysis of the Seismic Coda of Local Earthquakes as Scattered Waves[J].J Geophys Res,1969,74:615-631.
[8]Aki K,Chouet B.Origin of Coda Waves:Source,Attenuation,and Scattering Effects[J].J Geo-phys Res,1975,80(23):3 322-3 342.
[9]陈章立.浅论地震预报地震学方法基础[M].北京:地震出版社.2004.
[10]Gupta S C,Teotia S S,Rai S S et al.CodaQEstimates in the Koyna Region,India[J].Pure applGeophys,1998,153:713-731.
[11]Sharma B,Kumar S.Attenuation of P,S,and coda waves in Koyna region,India[J].J Seismol,2007,11:327-344.
[12]华卫,赵翠萍,陈章立,等.龙滩水库地区P、S波和尾波衰减[J].地震学报(待刊).
[13]Aki K.Attenuation of shear waves in the lithosphere for frequencies from 0.05 to 25 Hz[J].PhysEarth Planet Interiors,1980,21(1):56-60.
[14]Pulli J J,Aki K.Attenuation of seismic waves in the lithosphere:comparison of active and stable ar-eas,in earthquakes and earthquake engineering[M].Ann Arbor Science Publishers,Ann Arbor,Michigan,1981,129-141.
[15]Babita S S,Dinesh K T,Attenuation of P,S,and coda waves in Koyna region,India[J].Journal ofSeis,2007,11:327-344.
[16]VanEck T.Attenuation of coda waves in the Dead Sea region[J].Bull Seism Soc Amer,1988,78:770-779.
[17]Roecker S W,Tucker B,King J et al.Estimates ofQin central Asia as a function of frequency anddepth using the coda of locally recorded earthquakes[J].Bull Seism Soc Amer,1982,72(1):129-149.
[18]Pulli J J.Attenuation of coda waves in New England[J].Bull Seism Soc Amer,1984,74(4):1 149-1 166.
[2]Jin A,Aki K.Spatial and Temporal Correlation Between CodaQ-1and Seismicity and Its PhysicalMechanism[J].J Geophys Res,1989,94:14 041-14 059.
[3]A J,K A.Spatial and Temporal Correlation Between CodaQ-1and Seismicity and Its PhysicalMechanism[J].J Geodynamics,1993,17:95-120.
[4]Sato H.Energy propagation including scattering effects:Single isotropic scattering approximation[J].J Geophy Earth,1977,25:27-41.
[5]胡先明,谢蓉华.紫坪铺水库地震台网记录地震的复杂性[J].四川地震,2006(2):17-20.
[6]张培震,徐锡伟,闻学泽,等.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,2008,51(4):1 066-1 073.
[7]Aki K.Analysis of the Seismic Coda of Local Earthquakes as Scattered Waves[J].J Geophys Res,1969,74:615-631.
[8]Aki K,Chouet B.Origin of Coda Waves:Source,Attenuation,and Scattering Effects[J].J Geo-phys Res,1975,80(23):3 322-3 342.
[9]陈章立.浅论地震预报地震学方法基础[M].北京:地震出版社.2004.
[10]Gupta S C,Teotia S S,Rai S S et al.CodaQEstimates in the Koyna Region,India[J].Pure applGeophys,1998,153:713-731.
[11]Sharma B,Kumar S.Attenuation of P,S,and coda waves in Koyna region,India[J].J Seismol,2007,11:327-344.
[12]华卫,赵翠萍,陈章立,等.龙滩水库地区P、S波和尾波衰减[J].地震学报(待刊).
[13]Aki K.Attenuation of shear waves in the lithosphere for frequencies from 0.05 to 25 Hz[J].PhysEarth Planet Interiors,1980,21(1):56-60.
[14]Pulli J J,Aki K.Attenuation of seismic waves in the lithosphere:comparison of active and stable ar-eas,in earthquakes and earthquake engineering[M].Ann Arbor Science Publishers,Ann Arbor,Michigan,1981,129-141.
[15]Babita S S,Dinesh K T,Attenuation of P,S,and coda waves in Koyna region,India[J].Journal ofSeis,2007,11:327-344.
[16]VanEck T.Attenuation of coda waves in the Dead Sea region[J].Bull Seism Soc Amer,1988,78:770-779.
[17]Roecker S W,Tucker B,King J et al.Estimates ofQin central Asia as a function of frequency anddepth using the coda of locally recorded earthquakes[J].Bull Seism Soc Amer,1982,72(1):129-149.
[18]Pulli J J.Attenuation of coda waves in New England[J].Bull Seism Soc Amer,1984,74(4):1 149-1 166.
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