利用集集地震余震记录分析场地地震动反应
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摘要
利用1999年台湾地区"921集集大地震"的余震记录,用传统谱比法、线性反演法、S波接收函数法和遗传算法对比分析了车笼埔断层近场区域的场地反应.通过对比4种方法的卓越频率和场地放大因子,发现各种方法能给出较一致的卓越频率,但每种方法的场地反应放大值不完全相同.结果表明,线性反演法与传统谱比法的结果受到参考场自身场地反应的影响;遗传算法作为一种绝对场地反应计算方法其结果是可行的,用遗传算法计算得到的参考场结果对线性反演法结果进行校正,校正后的线性反演法与遗传算法结果非常吻合,也证明了遗传算法结果的可行性,建议推广遗传算法来计算场地反应;接收函数法的结果则同其他3种方法的结果相差较大,考虑到运用强震记录进行H/V方法计算的物理机制仍有争议,建议在实际应用中,慎重考虑应用S波H/V的方法来估计场地放大.最后给出车笼埔断层研究区0.4~20Hz频率范围内S波品质因子值为Qs=69.7f0.73.
Site effects are analyzed for the Chelongpu fault area using the aftershock strong-motion data of the 1999 Chi-Chi,Taiwan,earthquake.Four techniques are used including traditional spectral ratios of S wave,generalized inversion technique,receiver function of S wave and genetic algorithm. Our results show that the predominant frequencies for each site estimated by these four methods are almost the same.However,the site amplifications for each site obtained by these methods have some differences.The results of generalized inversion technique and the traditional spectral ratio method are affected by the reference site.After corrected by the site effect of the reference site obtained by genetic algorithm,the corrected results of the generalized inversion technique agree well with the results of genetic algorithm.This shows that genetic algorithm is a reasonable technique to estimate the absolute site effect for a site.In this study,usually,the site amplification obtained by the method of the receiver function is larger than other three techniques.Considering there are still many unclear issues in this method,we suggest that one should be very careful when using receiver function to estimate the site effect.Finally,we gave the Q_Svalue calculated by generalized inversion technique.It is frequency dependent,Q_S=69.7f?~0.73,in the range of frequency 0.4～20Hz.
Site effects are analyzed for the Chelongpu fault area using the aftershock strong-motion data of the 1999 Chi-Chi,Taiwan,earthquake.Four techniques are used including traditional spectral ratios of S wave,generalized inversion technique,receiver function of S wave and genetic algorithm. Our results show that the predominant frequencies for each site estimated by these four methods are almost the same.However,the site amplifications for each site obtained by these methods have some differences.The results of generalized inversion technique and the traditional spectral ratio method are affected by the reference site.After corrected by the site effect of the reference site obtained by genetic algorithm,the corrected results of the generalized inversion technique agree well with the results of genetic algorithm.This shows that genetic algorithm is a reasonable technique to estimate the absolute site effect for a site.In this study,usually,the site amplification obtained by the method of the receiver function is larger than other three techniques.Considering there are still many unclear issues in this method,we suggest that one should be very careful when using receiver function to estimate the site effect.Finally,we gave the Q_Svalue calculated by generalized inversion technique.It is frequency dependent,Q_S=69.7f?~0.73,in the range of frequency 0.4～20Hz.
引文
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[16]Souriau A,Roulle A,Ponsolles C.Site effects in the city of Lourdes,France,from H/V measurements:Implications for seismic-risk evaluation.BSSA,2007,97(6):2118~2136
[17]Lermo J,Chavez-Garcia FJ.Site effect evaluation using spectral ratios with only one station.BSSA,1993,83(5):1574~1594
[18]Lee WHK,Shin TC,Kuo KW,et al.CWB free-field strong-motion data from the 21 September Chi-Chi,Taiwan,earthquake.BSSA,2001,91(5):1370~1376
[19]Huang HC,Yang YT,Huang CC.Site response evaluation using the H/V ratio at the Yan-Liau station in Hualien,Taiwan.Pure Appl Geophys,2002,159:2715~2731
[20]Zhang WB,Zhou YN,Xie LL.Estimation of absolute site amplification.Earthquake Engineering and Engineering Vibration,2001,21(4):1~9(inChinese)章文波,周雍年,谢礼立.场地放大效应的估计.地震工程与工程振动,2001,21(4):1~9
[2]Borcherdt RD.Effects of local geology on ground motion near San Francisco Bay.BSSA,1970,60(1):29~61
[3]Andrews DJ.Objective determination of source parameters and similarity of earthquakes of different size.Earthquake Source Mechanics,1986,6:259~267
[4]Steidl JH,Tumarkin AG,Archuleta RJ.What is a reference site?BSSA,1996,86(6):1733~1748
[5]Nakamura Y.A method for dynamic characteristics estimations of subsurface using microtremors on the ground surface.Quarterly Rep RTRI,Jpn,1989,30:25~33
[6]Chavez-Garcia FJ,Dominguez T,Rodriguez M,et al.Site effects in a volcanic environment:A comparison between HVSR and array techniquesat Colima,Mexico.BSSA,2007,97(2):591~604
[7]Moya A,Aguirre J,Irikura K.Inversion of source parameters and site effects from strong ground motion records using genetic algorithms.BSSA,2000,90(4):977~992
[8]Zhang WB,Xie LL,Guo MZ.Estimation on site-amplification from different methods using strong motion data obtained in Tangshan,China.ActaSeismologica Sinica,2001,23(6):604~614(in Chinese)章文波,谢礼立,郭明珠.利用强震记录分析场地的地震反应.地震学报,2001,23(6):604~614
[9]Matsunami K,Zhang WB,Irikura K,et al.Estimation of seismic site response in the Tangshan area,China,using deep underground records.BSSA,2003,93(3):1065~1078
[10]Field EH,Jacob KH.A comparison and test of various site-response estimation techniques,including three that are not reference-site dependent.BSSA,1995,85(4):1127~1143
[11]Parolai S,Bindi D,Augliera P.Application of the generalized inversion technique(GIT)to a microzonation study:numerical simulations andcomparison with different site-estimation techniques.BSSA,2000,90(2):286~297
[12]Assimaki D,Li W,Steidl JH,et al.Site amplification and attenuation via downhole array seismogram inversion:A comparative study of the 2003Miyagi-Oki aftershock sequence.BSSA,2008,98(1):301~330
[13]Shin TC,Kuo KW,Lee WHK,et al.A preliminary report on the 1999 Chi-Chi(Taiwan)earthquake.Seismological Research Letters,2000,71(1):24~30
[14]Lee WHK,Shin TC,Kuo KW,et al.CWB free-field strong-motion data from the 921 Chi-Chi earthquake:processed acceleration files on CD-ROM,strong-motion data series CD-001.Taipei:Seismological Observation Center,Central Weather Bureau,2001
[15]Lee CT,Cheng CT,Liao CW,et al.Site classification of Taiwan free-field strong-motion stations.BSSA,2001,91(5):1283~1297
[16]Souriau A,Roulle A,Ponsolles C.Site effects in the city of Lourdes,France,from H/V measurements:Implications for seismic-risk evaluation.BSSA,2007,97(6):2118~2136
[17]Lermo J,Chavez-Garcia FJ.Site effect evaluation using spectral ratios with only one station.BSSA,1993,83(5):1574~1594
[18]Lee WHK,Shin TC,Kuo KW,et al.CWB free-field strong-motion data from the 21 September Chi-Chi,Taiwan,earthquake.BSSA,2001,91(5):1370~1376
[19]Huang HC,Yang YT,Huang CC.Site response evaluation using the H/V ratio at the Yan-Liau station in Hualien,Taiwan.Pure Appl Geophys,2002,159:2715~2731
[20]Zhang WB,Zhou YN,Xie LL.Estimation of absolute site amplification.Earthquake Engineering and Engineering Vibration,2001,21(4):1~9(inChinese)章文波,周雍年,谢礼立.场地放大效应的估计.地震工程与工程振动,2001,21(4):1~9
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