厚盖层场地的联合效应和强地面运动随机模拟
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摘要
对于既缺少深钻孔资料,又缺少数字地震记录资料的厚盖层场地,其场地放大和衰减联合效应(简称"场地联合效应")用常规方法估计困难。本文依据强地面运动随机模拟方法的预测方程,用近场中小地震的加速度记录,估计新疆伽师厚盖层场地的放大因子和高频滤波因子之积──场地联合效应,非线性矫正结果显示,场地的联合效应因子在0.5～10Hz大于2,在1～4Hz达到4。依此联合效应因子对研究区的强地面运动进行了随机模拟,预测结果与实际记录吻合较好。
For the sites lacking the data of the boreholes and digital seismic records, "the combined effect of amplification and attenuation"(ab.'the combined effect') is difficult to estimate using usual methods. Relying on the prediction function of stochastic method, the combined effect factor (the product of the amplification factor and the high-frequency attenuation factor) can be estimated by the acceleration records of small-middle earthquake near source easily. The rectified result for the site nonlinearity shows that the combined effect factor is greater than 2 in 0.5～10 Hz and reaches 4 in 1.0～4.0 Hz. According to the combined effect factor we have determined, the stochastic simulation of the strong ground motions of the research region is consistent with the actual records.
For the sites lacking the data of the boreholes and digital seismic records, "the combined effect of amplification and attenuation"(ab.'the combined effect') is difficult to estimate using usual methods. Relying on the prediction function of stochastic method, the combined effect factor (the product of the amplification factor and the high-frequency attenuation factor) can be estimated by the acceleration records of small-middle earthquake near source easily. The rectified result for the site nonlinearity shows that the combined effect factor is greater than 2 in 0.5～10 Hz and reaches 4 in 1.0～4.0 Hz. According to the combined effect factor we have determined, the stochastic simulation of the strong ground motions of the research region is consistent with the actual records.
引文
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[2] O^guz¨Ozel,EdwardCranswick,MarkMeremont,MustafaErdik,ErdalSafak.SiteeffectsinAvcilar,WestofIstanbul,Turkey,fromstrong-andweak-motiondata[J].Bull.Seism.Soc.Amer.2002,92(1):499-508.
[3] Boore,D.M.,Joyner,W.B.Estimationofgroundmotionatdeep-soilsitesineasternNorthAmerica[J].Bull.Seism.Soc.Amer,1991,81(6):2167-2185.
[4] Boore,D.M.,Joyner,W.B.Siteamplicationsforgenericrocksites[J].Bull.Seism.Soc.Amer.1997,87(2):327-341.
[5] AaronMoya,JorgeAguirre,KojiroIrikura.Inversionofsourceparametersandsiteeffectsfromstronggroungmotionrecordsusinggeneticalgorithms[J].Bull.Seism.Soc.Amer,2000,90(4):977-992.
[6] 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):51-61.
[7] ReachelE.Abercrombie.Near-surfaceattenuationandsiteeffectsfromcomparisonofsurfaceanddeepborerecordings[J].Bull.Seism.Soc.Amer,1997,87(3):731-744.
[8] ToshimiSatoh,HiroshiKawase,ToshiakiSato.StatisticalspectralmodelofearthquakeintheEasternTohokuDistrict,Japan,BasedonrhesurfaceandboreholerecordsobservedinSendai[J].Bull.Seism.Soc.Amer,1997,87(2):446-462.
[9] LuisFabianBonilla,JamisonH.Steidl,Jean-ChistopheGariel,RalphJ.Archuuleta.BoreholeresponsestudiesatGarnerValletDownholearray,SouthernCalifornia[J].Bull.Seism.Soc.Amer,2002,92(8):3165-3179.
[10] Brune,J.N.Tectonicstressandthespectraofseismicshearwavesfromearthquakes[J].J.Geophys.Res.1970,75:4997-5009.
[11] Brune,J.N.Correction[J].J.Geophys.Res.1971,76:5002.
[12] 姜慧,唐丽华,宋立军,等.2003年5月4日新疆伽师-岳普湖5.8级地震烈度考察报告[R].2003.
[13] 张良臣,等.新疆板块构造及地壳演化[A].第二界天山地质矿产论文集[C].1990.
[14] 刘启元,陈九辉,李顺成,等.新疆伽师强震群区三维地壳上地幔S波速度结构及其地震成因的探讨[J].地球物理学报,2000,43(3):356-365.
[15] 陈培善,陈海通.由二维破裂模式导出的地震定标律[J].地震学报,1989,11(4):337-350.
[16] Abrahamson,N.A.,Silva,W.J.EmpiricalResponseSpectralAttenuationRelationshipsforShallowCrustalEarthquakes[J].SeismologicalResearchLetters,1997,68(1):94-127.
[17] NelsonLam,JohnWilson,GrahamHutchinson.GenerationofsyntheticearthquakeaccelerogramsusingseismologicalModelling:Areview[J].JournalofEarthquakeEngineering,2000,4(3):321-354.
[18] 周仕勇.1997年伽师强震群研究及其生成机理的探索[D].北京:中国地震局地球物理研究所,1997.
[19] ErdealSafak.Analyticalapproachtocalculationofresponsespectrafromseismologicalmodelofgroundmotion[J].EarthquakeEngineeringandStructuralDynamics,1988,16:124-143.
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