昆明台附近区域地震尾波Q值分析
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摘要
采用Aki和Chouet的地震尾波单次散射模型,从IRIS台网下载昆明台记录到的200km范围内182次地震事件共546条宽频带观测资料.根据震中距的大小和地震分布的成丛性,在昆明台附近划分6个小区块,并计算了各区块对应散射椭球体内的尾波Qc值.计算得到这些散射椭球体内介质品质因子Q0在40—55之间,频率相关系数η在0.96—1.06之间.表明该地区是以低Q高η值为特征的构造活跃区.
This study uses the single scattering model of seismic coda waves proposed by Aki and Chouet.546 broadband seismic records from 182 earthquakes nearby Kunming station,with epicentral distances less than 200 km,were downloaded from IRIS website. According to epicenter distances and earthquake clusters,earthquakes in 6 sub-regions were selected for studying coda Qc in the volume of corresponding scattering ellipsoids. The calculated Q0 values and η factors are about 40—55 and 0.96—1.06,respectively,suggesting that the study region is a tectonically active zone characterized with low Q0 and high η value.
This study uses the single scattering model of seismic coda waves proposed by Aki and Chouet.546 broadband seismic records from 182 earthquakes nearby Kunming station,with epicentral distances less than 200 km,were downloaded from IRIS website. According to epicenter distances and earthquake clusters,earthquakes in 6 sub-regions were selected for studying coda Qc in the volume of corresponding scattering ellipsoids. The calculated Q0 values and η factors are about 40—55 and 0.96—1.06,respectively,suggesting that the study region is a tectonically active zone characterized with low Q0 and high η value.
引文
黄才中,葛焕称.1995.中国东部的尾波衰减特征和Qc值估计[J].地震学报,17(2):196-202.
李白基,秦嘉政,钱晓东,叶建庆.2004.云南姚安地区的尾波衰减[J].地震学报,26(1):47-52.
李白基,秦嘉政,谢庆茵,蔡绍平.2000.云南武定1995年地震余震尾波Qc[J].地震地磁观测与研究,21(2):1-6.
李琼,秦嘉政,钱晓东.2007.2007年宁洱6.4级地震余震序列尾波Qc值研究[J].地震研究,30(4):337-343.
李霞,张志慧,许萍,李亚军.2008.胶东半岛及两侧海域尾波Q值分析[J].地震地磁观测与研究,29(2):14-20.
吕坚,朱新运,高建华,沈小七,汤兰荣,肖建华.2006.江西九江—瑞昌震区的尾波衰减特征初探[J].地震,26(4):15-21.
马云生,张中天,张焕生.1995.北京及其周围地区尾波Q值分布特征的研究[J].地震学报,17(4):448-458.
马云生.1990.云南地区尾波Q值分布特征的研究[D].北京:国家地震局地球物理研究所:1-50.
周蕙兰.1990.地球内部物理[M].北京:地震出版社:218-227.
Aki K.1969.Analysis of the seismic coda of local earthquake as scattered waves[J].J Geophys Res,74(2):615-631.
Aki K,Chouet B.1975.Origin of the coda wave:Source,attenuation and scattering effects[J].J Geophys Res,80(B23):3322-3342.
Aki K.1980.Attenuation of shear waves in the lithosphere for frequencies from0.05to25Hz[J].Phys Earth PlanetInteri,21(1):50-60.
Herrmann R B.1980.Qesti mates using the coda of local earthquake[J].Bull Seism Soc Amer,70(2):447-468.
Hell weg M,Spudich P,Fletcher J B,Baker L M.1995.Stability of codaQin the region of Parkfield,California:Viewfromthe U.S.Geological Survey Parkfield Dense Seismograph Array[J].J Geophys Res,100(B2):2089-2102.
Jin A,Mayeda K,Adams D,Aki K.1994.Separation of intrinsic and scattering attenuationin southern California usingTERRAscope data[J].J Gephys Res,99(B9):17835-17848.
Naresh K,I mtiyaz A P,Virk H S.2005.Esti mation of coda wave attenuation for NW Hi malayan region using localearthquakes[J].Phys Earth Planet Interi,151(3-4):243-258.
Pulli J.1984.Attenuation of coda wave in New England[J].Bull Seism Soc Amer,74(4):1149-1166.
Rautian T G,Khalturin VI.1978.The use of coda for determination of the earthquake source spectrum[J].Bull SeismSoc Amer,68(4):923-948.
Sato H.1977.Energy propagation including scattering effects:Single isotropic scattering approxi mation[J].J PhysEarth,(25):27-41.
Singh S,Herrmann R B.1983.Regionalization of crustal codaQinthe continental United states[J].J Geophys Res,88(B1):527-538.
Woodgold C D R.1990.Esti mation ofQin eastern Canada using coda waves[J].Bull Seism Soc Amer,80(2):411-429.
李白基,秦嘉政,钱晓东,叶建庆.2004.云南姚安地区的尾波衰减[J].地震学报,26(1):47-52.
李白基,秦嘉政,谢庆茵,蔡绍平.2000.云南武定1995年地震余震尾波Qc[J].地震地磁观测与研究,21(2):1-6.
李琼,秦嘉政,钱晓东.2007.2007年宁洱6.4级地震余震序列尾波Qc值研究[J].地震研究,30(4):337-343.
李霞,张志慧,许萍,李亚军.2008.胶东半岛及两侧海域尾波Q值分析[J].地震地磁观测与研究,29(2):14-20.
吕坚,朱新运,高建华,沈小七,汤兰荣,肖建华.2006.江西九江—瑞昌震区的尾波衰减特征初探[J].地震,26(4):15-21.
马云生,张中天,张焕生.1995.北京及其周围地区尾波Q值分布特征的研究[J].地震学报,17(4):448-458.
马云生.1990.云南地区尾波Q值分布特征的研究[D].北京:国家地震局地球物理研究所:1-50.
周蕙兰.1990.地球内部物理[M].北京:地震出版社:218-227.
Aki K.1969.Analysis of the seismic coda of local earthquake as scattered waves[J].J Geophys Res,74(2):615-631.
Aki K,Chouet B.1975.Origin of the coda wave:Source,attenuation and scattering effects[J].J Geophys Res,80(B23):3322-3342.
Aki K.1980.Attenuation of shear waves in the lithosphere for frequencies from0.05to25Hz[J].Phys Earth PlanetInteri,21(1):50-60.
Herrmann R B.1980.Qesti mates using the coda of local earthquake[J].Bull Seism Soc Amer,70(2):447-468.
Hell weg M,Spudich P,Fletcher J B,Baker L M.1995.Stability of codaQin the region of Parkfield,California:Viewfromthe U.S.Geological Survey Parkfield Dense Seismograph Array[J].J Geophys Res,100(B2):2089-2102.
Jin A,Mayeda K,Adams D,Aki K.1994.Separation of intrinsic and scattering attenuationin southern California usingTERRAscope data[J].J Gephys Res,99(B9):17835-17848.
Naresh K,I mtiyaz A P,Virk H S.2005.Esti mation of coda wave attenuation for NW Hi malayan region using localearthquakes[J].Phys Earth Planet Interi,151(3-4):243-258.
Pulli J.1984.Attenuation of coda wave in New England[J].Bull Seism Soc Amer,74(4):1149-1166.
Rautian T G,Khalturin VI.1978.The use of coda for determination of the earthquake source spectrum[J].Bull SeismSoc Amer,68(4):923-948.
Sato H.1977.Energy propagation including scattering effects:Single isotropic scattering approxi mation[J].J PhysEarth,(25):27-41.
Singh S,Herrmann R B.1983.Regionalization of crustal codaQinthe continental United states[J].J Geophys Res,88(B1):527-538.
Woodgold C D R.1990.Esti mation ofQin eastern Canada using coda waves[J].Bull Seism Soc Amer,80(2):411-429.
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