关中陕南及周边地区地震波衰减和场地响应研究
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摘要
利用陕西地震台网2002~2006年关中陕南和周边地区发生地震的记录资料,采用多台多事件联合法,研究了关中陕南及周边地区的介质品质因子Q值和各台站的场地响应特征。用Atk inson方法求解介质品质因子Q值,其结果为Q=343.26f0.593 1。场地响应分别用Atk inson方法和Moya方法进行计算,并对2种结果进行对比分析,两种结果虽有差异,但场地响应随频率f变化趋势是一致的。场地响应结果显示,台基位于渭北黄土塬区的合阳台、蒲城台、彬县台及陇县台4个台在高频部分具有明显的衰减吸收效应。台基位于秦岭山脉、关中盆地和陕南地区的华阴台、西安台、周至台、宁陕台、汉中台、安康台、泾阳台及乾县台无明显的放大吸收作用。太白台在高频部分(10~20 Hz)显示有放大作用。
According to the multi-stations and multi-events joint method,using the seismic waveform recorded by Shaanxi seismic network from 2002 to 2006,the media quality factor Q and site response of every station in Guanzhong-Shannan and its adjacent region are studied.The media quality factor Q is solved by the Atkinson method.The site response is calculated by Atkinson method and Moya method,and two kinds of result are analyzed comparatively,although there is some difference in two kinds of result,the trend of site response dependent frequency is unanimous.The site response result of stations shows that there is clear absorption attenuation effect in high—frequency part in Heyang,Pucheng,Binxian and Longxian station which lie in Weibei loess plateau area;there is no obvious amplification and attenuation effect in Huayin,Xi'an,Zhouzhi,Ningshan,Hanzhong,Ankang,Jingyang and Qianxian station which lie in Qinling mountain,Guanzhong basin and Shannan area and there is amplification in high—frenquency part(10～20 Hz) in Taibai station.
According to the multi-stations and multi-events joint method,using the seismic waveform recorded by Shaanxi seismic network from 2002 to 2006,the media quality factor Q and site response of every station in Guanzhong-Shannan and its adjacent region are studied.The media quality factor Q is solved by the Atkinson method.The site response is calculated by Atkinson method and Moya method,and two kinds of result are analyzed comparatively,although there is some difference in two kinds of result,the trend of site response dependent frequency is unanimous.The site response result of stations shows that there is clear absorption attenuation effect in high—frequency part in Heyang,Pucheng,Binxian and Longxian station which lie in Weibei loess plateau area;there is no obvious amplification and attenuation effect in Huayin,Xi'an,Zhouzhi,Ningshan,Hanzhong,Ankang,Jingyang and Qianxian station which lie in Qinling mountain,Guanzhong basin and Shannan area and there is amplification in high—frenquency part(10～20 Hz) in Taibai station.
引文
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[2]黄玉龙,郑斯华,刘杰,等.广东地区地震动衰减和场地响应的研究[J].地球物理学报,2003,46(1):54-61.
[3]Lam NTK,Wilson J L.Generation of synthetic earthquake acceleragrams using seismological modeling review[J].Jouranlof Earthquake Engineering,2000,4(3):321-354.
[4]Atkinson G M,Mereu R F.The shape of ground motion attenuation curves in southeastern Canada[J].Bull Seism soc Am,1992,82(5):2 014-2 031.
[5]Moya A,Aguirre J,Irikura K.Inversion of source parameters and site effects from strong ground motion records usinggenetic algorithms[J].Bull Seism Soc Amer,2000,90(4):977-992.
[6]Brune N.Correction[J].J Geophs Res,1971,76:5 002.
[7]啜永清,苏燕,贾建喜.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[J].地震学报,2004,26(4):369-378.
[8]张永久,乔慧珍,程万正,等.四川盆地地区介质衰减特征研究[J].地震研究,2007,30(1):43-48.
[9]孟智民,谢家树,张宪.关中陕南及周边地区尾波衰减特性研究[J].西北地震学报,2005,27(1):75-79.
①陕西省地震局.陕西地区地震波走时表,1985.
①①甘肃省地震局.甘肃省地震局2006度会商报告,2006.
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