浙江皎口水库地震震源参数研究
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摘要
利用浙江省区域数字地震台网记录的皎口水库地震波资料,采用Brune(1970)模式,通过几何扩散校正、介质衰减校正、仪器校正等,将速度记录谱归算为震源位移谱,使用遗传算法计算拐角频率及零频极限,进而计算震源半径、地震矩等小震震源参数,系统分析各种参数之间的关系。分析2009年9月—2010年1月间M_L 1.0—3.3皎口水库库区28次地震,结果为:地震矩范围为10~(11)—10~(13)N·m,震源破裂半径为110—319 m,地震矩、拐角频率、矩震级及体波震级之间表现出一定的对数线性或半对数线性关系,并可分别表示为:1gM=0.01177R+10.2,1gM=1.009M_L+10.5,M_W=0.667M_L+0.98534。地震应力降范围为0.02—2.05 MPa,应力降与震源半径之间表现出一定的相关关系。
Using Brune model(1970)and the seismic data of Jiaokou reservoir recorded by the regional digital seismic station of Zhejiang Province,we transferred the velocity record spectrum into hypocenter displacement spectrum by geometry diffusion correction,dielectric attenuation correction and instrumental correction.The corner frequency and zero frequency were calculated using genetic algorithm.Then hypocentral parameters including hypocentral radius and seismic moment were calculated and the relationships between them were analyzed systematically.28 regional earthquakes of M_L 1.0—3.3,occurred between 2009-09 and 2010-01 were used in this study.The results show that the seismic moments of these earthquakes are 10~(11)—10~(13)N·m and rupture radius are 110—319 m.There are log-linear relationships between seismic moments and corner frequency,seismic moment and body-wave magnitude and semi-log-linear relationships between moment magnitude and body-wave magnitude. They can be expressed:1gM=0.01177R + 10.2,lgM=1.009M_L + 10.5,M_W= 0.667M_L +0.98534.The seismic stress drops ranges from 0.02—2.05 MPa and some correlation shows between stress drop and hypocenter radius.
Using Brune model(1970)and the seismic data of Jiaokou reservoir recorded by the regional digital seismic station of Zhejiang Province,we transferred the velocity record spectrum into hypocenter displacement spectrum by geometry diffusion correction,dielectric attenuation correction and instrumental correction.The corner frequency and zero frequency were calculated using genetic algorithm.Then hypocentral parameters including hypocentral radius and seismic moment were calculated and the relationships between them were analyzed systematically.28 regional earthquakes of M_L 1.0—3.3,occurred between 2009-09 and 2010-01 were used in this study.The results show that the seismic moments of these earthquakes are 10~(11)—10~(13)N·m and rupture radius are 110—319 m.There are log-linear relationships between seismic moments and corner frequency,seismic moment and body-wave magnitude and semi-log-linear relationships between moment magnitude and body-wave magnitude. They can be expressed:1gM=0.01177R + 10.2,lgM=1.009M_L + 10.5,M_W= 0.667M_L +0.98534.The seismic stress drops ranges from 0.02—2.05 MPa and some correlation shows between stress drop and hypocenter radius.
引文
刘丽芳,秦嘉政.会泽5． 3级和文山5． 3级地震序列震源参数研究[J].地震研究,2006,29(1) :43-49．
李一正,等.滇西地区震级与地震矩标度[J].地震研究,1985,8(6) :617-632．
毛玉平,万登堡.2000年云南姚安6． 5级地震[M].北京:科学出版社,2001:90．
秦嘉政,叶建庆,钱晓东,等.2000年姚安地震的震源参数[J].地球物理学报,2003,46(5) :633-641．
于俊谊,朱新运.浙江珊溪水库地震震源参数研究[J].中国地震,2008,24(4) :379-387．
朱新运,等.基于SATO模型的近震S波尾波Q值求解及分析软件研制[J].地震地磁观测与研究,2005,26(3) :63-70．
朱新运,陈运泰.用Lg波资料反演场地效应与地震波衰减参数[J].地震学报,2007,29(6) :569-580．
朱新运,于俊谊.基于MATLAB的小震震源参数计算软件研制[J].中国地震,2008,24(4) :379-387．
Aaron Moya,Jorge Aguirre,Kojiro Irikura.Inversion of Source Parameters and Site Effects from Strong Ground Motion Records using Genetic Algorithmss[J].BSSA,2000,94:977-992．
Bakun W H.Seismic moment,local magnitudes and coda-duration magnitude for earthquakes in central California[J].BSSA,1984,74:439-458．
Bindi D,Spallarossa D,Augliera P,et al.Source Parameters Estimated from the Aftershocks of the 1997 Umbria-Marche(Italy)Seismic Sequence[J].BSSA,2001,91:448-455．
Brune J N.Tectonic stress and the spectra of seismic shear wavesfrom earthquakes[J].JGR,1970,75:4 997-5 009．
Chael E.Spectral scaling of earthquakes in the Miramichi region ofNew Brunswick[J].BSSA,1987,77:347-365．
Giampiccolo E,D'Amico S,Patane D,et al.Attenuation and Source Parameters of Shallow Microearthquakes at Mt.Etna Volcano,Italy[J].BSSA,2007,97:184-197．
Matsunmni K,Nakamura M.Seismic attenuation in a nonvolcanic swagln region beneath Wakayama,southwest Japan[J].J G R,2004,109CB9) :302．
Moya C A,Aguirre J,Irikura K.Inversion of source parameters and site effects from strong ground motion records using genetic algonthms[J].BSSA,2000,90(4) :977-992．
Zhu Xinyun,Chen Yuntai.An inversion of site response and Lg attenuation using Lg waveform[J].Acta Seismologica Sinica,2007,20(6) :605-616．
李一正,等.滇西地区震级与地震矩标度[J].地震研究,1985,8(6) :617-632．
毛玉平,万登堡.2000年云南姚安6． 5级地震[M].北京:科学出版社,2001:90．
秦嘉政,叶建庆,钱晓东,等.2000年姚安地震的震源参数[J].地球物理学报,2003,46(5) :633-641．
于俊谊,朱新运.浙江珊溪水库地震震源参数研究[J].中国地震,2008,24(4) :379-387．
朱新运,等.基于SATO模型的近震S波尾波Q值求解及分析软件研制[J].地震地磁观测与研究,2005,26(3) :63-70．
朱新运,陈运泰.用Lg波资料反演场地效应与地震波衰减参数[J].地震学报,2007,29(6) :569-580．
朱新运,于俊谊.基于MATLAB的小震震源参数计算软件研制[J].中国地震,2008,24(4) :379-387．
Aaron Moya,Jorge Aguirre,Kojiro Irikura.Inversion of Source Parameters and Site Effects from Strong Ground Motion Records using Genetic Algorithmss[J].BSSA,2000,94:977-992．
Bakun W H.Seismic moment,local magnitudes and coda-duration magnitude for earthquakes in central California[J].BSSA,1984,74:439-458．
Bindi D,Spallarossa D,Augliera P,et al.Source Parameters Estimated from the Aftershocks of the 1997 Umbria-Marche(Italy)Seismic Sequence[J].BSSA,2001,91:448-455．
Brune J N.Tectonic stress and the spectra of seismic shear wavesfrom earthquakes[J].JGR,1970,75:4 997-5 009．
Chael E.Spectral scaling of earthquakes in the Miramichi region ofNew Brunswick[J].BSSA,1987,77:347-365．
Giampiccolo E,D'Amico S,Patane D,et al.Attenuation and Source Parameters of Shallow Microearthquakes at Mt.Etna Volcano,Italy[J].BSSA,2007,97:184-197．
Matsunmni K,Nakamura M.Seismic attenuation in a nonvolcanic swagln region beneath Wakayama,southwest Japan[J].J G R,2004,109CB9) :302．
Moya C A,Aguirre J,Irikura K.Inversion of source parameters and site effects from strong ground motion records using genetic algonthms[J].BSSA,2000,90(4) :977-992．
Zhu Xinyun,Chen Yuntai.An inversion of site response and Lg attenuation using Lg waveform[J].Acta Seismologica Sinica,2007,20(6) :605-616．
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