宁夏及邻区地震震源参数研究
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摘要
利用宁夏地震台网记录的宁夏及邻区数字地震波资料,采用Brune(1970)模型,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,并系统分析了各种参数之间的关系。使用发生于2003年6月—2007年12月ML1.7~4.4的186次地震事件估算的震源参数表明:地震矩、近震震级、破裂半径、拐角频率等之间可以拟合为对数或半对数线性关系。地震应力降、视应力与震源半径没有表现出明显的依赖关系,但与地震矩之间表现出正相关关系。与其他地区相比,此研究区属于低应力释放区域。
Using the Brune model(1970) and the digital seismic wave data of Ningxia and the adjacent regions,which was recorded by Ningxia seismic network,we transferred the recorded velocity spectrum into hypocenter displacement spectrum by geometry diffusion correction,dielectric attenuation correction and instrumental correction.The corner frequency and zero frequency were calculated by using genetic algorithm,further,the hypocentral parameters including hypocentral radius and seismic moment were calculated and the relationships among them were analyzed systematically.186 earthquake events from ML1.7 to ML4.4 which occurred from June,2003 to December,2007 were studied.The estimated results show that the relations between seismic moment,body-wave magnitude,rupture radius and corner frequency are near log-linear or semi-log-linear.Seismic stress drop and apparent stress show little obvious correlation with hypocenter radius,but display positive correlation with seismic moment.Compared with other regions,there are lower stresses released in the studied region.
Using the Brune model(1970) and the digital seismic wave data of Ningxia and the adjacent regions,which was recorded by Ningxia seismic network,we transferred the recorded velocity spectrum into hypocenter displacement spectrum by geometry diffusion correction,dielectric attenuation correction and instrumental correction.The corner frequency and zero frequency were calculated by using genetic algorithm,further,the hypocentral parameters including hypocentral radius and seismic moment were calculated and the relationships among them were analyzed systematically.186 earthquake events from ML1.7 to ML4.4 which occurred from June,2003 to December,2007 were studied.The estimated results show that the relations between seismic moment,body-wave magnitude,rupture radius and corner frequency are near log-linear or semi-log-linear.Seismic stress drop and apparent stress show little obvious correlation with hypocenter radius,but display positive correlation with seismic moment.Compared with other regions,there are lower stresses released in the studied region.
引文
1杨明芝,马禾青,廖玉华.宁夏地震活动与研究[M].北京:地震出版社,2007.
2陈素改,李光振.宁夏及邻近地区中强地震前后小震综合断层面解分析[J].华北地震科学,1994,12(2):33-43.
3朱新运,于俊谊.基于MATLAB的小震震源参数计算软件研制[J].西北地震学报,2008,30(4):380-384.
4师海阔,等.利用Aki模型对宁夏及邻区尾波Q值的研究[J].西北地震学报(待刊)
5 Brune J N.Tectonic Stress and the spectra of seismic shearwaves from earthquakes[J].JGR,1970,75:4 997-5009.
6 Bindi D,et a1.Source parameters estimated from the after-shocks of the 1997 Umbria-Marche(Italy)seismic se-quence[J].BSSA,2001,91:448-455.
7 Giampiccolo E,et al.Attenuation and source parameters ofshallow microearthquakes at Mt Etna Volcano,Italy[J].BSSA,2007,97:184-197.
8兰从欣,等.北京地区中小地震震源参数反演[J].地震学报,2005,27(5):498-507.
9秦嘉政,等.2000年姚安地震的震源参数[J].地球物理学报,2003,46(5):633-641.
10 Chael E.Spectral sealing of earthquakes in the Miramichiregion of New Brunswick[J].BSSA,1987,77:347-365.
11 Aaron M,Jorge Aand Kojiro I.Inversion of source parame-ters and site effects from strong ground motion records usinggenetic algorithmss[J].BSSA,2000,94:977-992.
12 Matsunmni K and Nakamura M.Seismic attenuation in anonvoleanic swagln region beneath Wakayama,southwestJapan[J].JGR,2004,109(B9):B09302.
13 Rautian TG and Khalturin VI.The use of the coda for de-termination of earthquake source spectrum[J].BSSA,1978,611:923-948.
14 Aki K.Attenuation of shear-waves in the lithosphere forfrequencies from0.05 to25Hz[J].Phys Earth Plant Interi-ors,1980,21:50-60.
15 Herrmama R B.Q estimates using the coda of local earth-quakes[J].BSSA,1980,70:447-468.
16 Kanamori H.The energy release in great earthquakes[J].JGR,1977,82:2 981-2 987.
17 Bakun W H.Seismic moment,local magnitudes and coda-duration magnitude for earthquakes in central California[J].BSSA,1984,74:439-458.
18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.
19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.
20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.
21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.
22季爱东,等.山东中西部及邻近地区震源参数和场地响应的反演[J].华北地震科学,2008,26(3):31-35.
23沈小七,等.安徽地区地震波衰减、场地响应及震源新参数的测定[J].地震地磁观测与研究,2005,26(3):1-10.
24赵英萍,等.河北唐山地区中小地震震源参数的测定[J].山西地震,2004,117(2):5-10.
25丁韫玉,王洪体,田小平.西安及周围地区小地震的震源参数[J].西北地震学报,1999,21(2):123-129.
26王卫东,等.陕西省关中及邻区地震的震源参数研究[J].地震研究,2004,27(4):330-333.
27刘芳,朱智勇.内蒙古中西部地区中小地震震源参数[J].华北地震科学,2007,25(2):10-14.
28秦嘉政,钱晓东.云南地区地震视应力的时间和空间分布研究[J].华北地震科学,2006,28(3):221-229.
2陈素改,李光振.宁夏及邻近地区中强地震前后小震综合断层面解分析[J].华北地震科学,1994,12(2):33-43.
3朱新运,于俊谊.基于MATLAB的小震震源参数计算软件研制[J].西北地震学报,2008,30(4):380-384.
4师海阔,等.利用Aki模型对宁夏及邻区尾波Q值的研究[J].西北地震学报(待刊)
5 Brune J N.Tectonic Stress and the spectra of seismic shearwaves from earthquakes[J].JGR,1970,75:4 997-5009.
6 Bindi D,et a1.Source parameters estimated from the after-shocks of the 1997 Umbria-Marche(Italy)seismic se-quence[J].BSSA,2001,91:448-455.
7 Giampiccolo E,et al.Attenuation and source parameters ofshallow microearthquakes at Mt Etna Volcano,Italy[J].BSSA,2007,97:184-197.
8兰从欣,等.北京地区中小地震震源参数反演[J].地震学报,2005,27(5):498-507.
9秦嘉政,等.2000年姚安地震的震源参数[J].地球物理学报,2003,46(5):633-641.
10 Chael E.Spectral sealing of earthquakes in the Miramichiregion of New Brunswick[J].BSSA,1987,77:347-365.
11 Aaron M,Jorge Aand Kojiro I.Inversion of source parame-ters and site effects from strong ground motion records usinggenetic algorithmss[J].BSSA,2000,94:977-992.
12 Matsunmni K and Nakamura M.Seismic attenuation in anonvoleanic swagln region beneath Wakayama,southwestJapan[J].JGR,2004,109(B9):B09302.
13 Rautian TG and Khalturin VI.The use of the coda for de-termination of earthquake source spectrum[J].BSSA,1978,611:923-948.
14 Aki K.Attenuation of shear-waves in the lithosphere forfrequencies from0.05 to25Hz[J].Phys Earth Plant Interi-ors,1980,21:50-60.
15 Herrmama R B.Q estimates using the coda of local earth-quakes[J].BSSA,1980,70:447-468.
16 Kanamori H.The energy release in great earthquakes[J].JGR,1977,82:2 981-2 987.
17 Bakun W H.Seismic moment,local magnitudes and coda-duration magnitude for earthquakes in central California[J].BSSA,1984,74:439-458.
18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.
19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.
20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.
21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.
22季爱东,等.山东中西部及邻近地区震源参数和场地响应的反演[J].华北地震科学,2008,26(3):31-35.
23沈小七,等.安徽地区地震波衰减、场地响应及震源新参数的测定[J].地震地磁观测与研究,2005,26(3):1-10.
24赵英萍,等.河北唐山地区中小地震震源参数的测定[J].山西地震,2004,117(2):5-10.
25丁韫玉,王洪体,田小平.西安及周围地区小地震的震源参数[J].西北地震学报,1999,21(2):123-129.
26王卫东,等.陕西省关中及邻区地震的震源参数研究[J].地震研究,2004,27(4):330-333.
27刘芳,朱智勇.内蒙古中西部地区中小地震震源参数[J].华北地震科学,2007,25(2):10-14.
28秦嘉政,钱晓东.云南地区地震视应力的时间和空间分布研究[J].华北地震科学,2006,28(3):221-229.
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