NGA模型概述及其在中国适用性的初步探讨
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摘要
该文旨在介绍美国下一代衰减关系(NGA)的技术要点和模型建立过程,重点讨论NGA模型对汶川地震的预测值和观测值的比较。通过对Mw7.9级汶川地震的断层距200km以内的基岩场地的地震动参数与NGA模型的预测值进行比较,结果表明:在反应谱短周期段(T<0.5s),观测值比NGA模型预测值略大;而在长周期段(T>1s),NGA模型预测值偏大(预测值与观测值的比值可达3～4)。最后探讨建立中国新一代地震动衰减关系的发展前景和面临的困难。
The technical background,modeling process and the key characteristics of Next Generation Attenuation(NGA) project is overviewed to discuss its applicability to the Chinese ground motions.Ground motions recorded at distance less than 200km on rock site from Wenchuan earthquake are compared with predicted parameters from NGA models.Preliminary results indicate that,Wenchuan earthquake produced slightly higher ground motions than the predicted ones at short periods(T<0.5s);but heavily smaller(a spectral ratio of about 3~4) ground motions at long periods(T>1s).Additionally,an outlook for Chinese future new generation attenuation relationship is given to discuss the necessity,possibility and challenges.
The technical background,modeling process and the key characteristics of Next Generation Attenuation(NGA) project is overviewed to discuss its applicability to the Chinese ground motions.Ground motions recorded at distance less than 200km on rock site from Wenchuan earthquake are compared with predicted parameters from NGA models.Preliminary results indicate that,Wenchuan earthquake produced slightly higher ground motions than the predicted ones at short periods(T<0.5s);but heavily smaller(a spectral ratio of about 3~4) ground motions at long periods(T>1s).Additionally,an outlook for Chinese future new generation attenuation relationship is given to discuss the necessity,possibility and challenges.
引文
[1]Power M,Chiou B,Abrahamson N,et al.An overview ofthe NGA project[J].Earthquake Spectra,2008,24:3-21
[2]Abrahamson N,Silva W.Summary of the Abrahamson&Silva NGA ground motion relations[J].EarthquakeSpectra,2008,24:67-97
[3]Boore D,Atkinson G.Ground motion prediction equationsfor the average horizontal component of PGA,PGV,and5%-damped PSA at spectral periods between 0.01s and10.0s[J].Earthquake Spectra,2008,24:99-138
[4]Campbell K,Bozorgnia Y.NGA ground motion model forthe geometric mean horizontal component of PGA,PGV,PGD and 5%damped linear elastic response spectra forperiods ranging from 0.01 to 10s[J].Earthquake Spectra,2008,24:139-171
[5]Chiou B,Youngs R.Chiou-Youngs.NGA ground motionrelations for the geometric mean horizontal component ofpeak and spectral ground motion parameters[J].Earthquake Spectra,2008,24:173-215
[6]Idriss I.An NGA empirical model for estimating the horizontalspectral values generated by shallow crustal earthquakes[J].Earthquake Spectra,2008,24:217-242
[7]Akkar S,Bommer J.Empirical equations for the predictionof PGA,PG V,and spectral accelerations in europe,themediterranean region,and the middle east[J].Seismological Research Letters,2010,81(2):195-206
[8]Akkar S,Bommer J.Empirical prediction equations forpeak ground velocity derived from strong-motion recordsfrom europe and the middle east[J].Bull.Seismol.Soc.Am.,2007,97:511-530
[9]郑锦桐,林柏伸,谢宝珊,等.新一代强地动衰减式对工址地震危害度分析之影响[J].中兴工程季刊,2010,109(10):31-40
[10]Chiou B,Darragh R,Gregor N,et al.NGA project strong-motion database[J].Earthquake Spectra,2008,24:23-44
[11]Boore D,Jennie Abrahamson N.Orientation independentmeasures of ground motion[J].Bull.Seismol.Soc.Am.,2006,96:1502-1511
[12]Abrahamson N,Youngs R.A stable algorithm for regressionanalyses using the random effects model[J].Bull.Seismol.Soc.Am.,1992,82:505-510
[13]Campbell K,Bozorgnia Y.Next generation attenuation(NGA)empirical ground motion models:can they be usedin Europe[C]//1st European Conference on EarthquakeEngineering and Seismology Geneva.Switzerland,2006:458
[14]Taheri J S,Naserieh S,Hadi G.A test of the applicabilityof NGA models to the strong ground-motion data in theiranian plateau[J].Journal of Earthquake Engineering,2010,14:278-292
[15]Wang Dong,Xie Lili,Abrahamson N,et al.Comparisonof strong ground motion from the Wenchuan,China,earthquake of 12 May 2008 with the next generationattenuation(NGA)ground motion models[J].Bull.Seismol.Soc.Am.,2010,100:2381-2395
[16]李小军,周正华,于海英,等.汶川8.0级地震强震动观测及记录初步分析[C]//汶川地震建筑震害分析与重建研讨会.北京,2008
[2]Abrahamson N,Silva W.Summary of the Abrahamson&Silva NGA ground motion relations[J].EarthquakeSpectra,2008,24:67-97
[3]Boore D,Atkinson G.Ground motion prediction equationsfor the average horizontal component of PGA,PGV,and5%-damped PSA at spectral periods between 0.01s and10.0s[J].Earthquake Spectra,2008,24:99-138
[4]Campbell K,Bozorgnia Y.NGA ground motion model forthe geometric mean horizontal component of PGA,PGV,PGD and 5%damped linear elastic response spectra forperiods ranging from 0.01 to 10s[J].Earthquake Spectra,2008,24:139-171
[5]Chiou B,Youngs R.Chiou-Youngs.NGA ground motionrelations for the geometric mean horizontal component ofpeak and spectral ground motion parameters[J].Earthquake Spectra,2008,24:173-215
[6]Idriss I.An NGA empirical model for estimating the horizontalspectral values generated by shallow crustal earthquakes[J].Earthquake Spectra,2008,24:217-242
[7]Akkar S,Bommer J.Empirical equations for the predictionof PGA,PG V,and spectral accelerations in europe,themediterranean region,and the middle east[J].Seismological Research Letters,2010,81(2):195-206
[8]Akkar S,Bommer J.Empirical prediction equations forpeak ground velocity derived from strong-motion recordsfrom europe and the middle east[J].Bull.Seismol.Soc.Am.,2007,97:511-530
[9]郑锦桐,林柏伸,谢宝珊,等.新一代强地动衰减式对工址地震危害度分析之影响[J].中兴工程季刊,2010,109(10):31-40
[10]Chiou B,Darragh R,Gregor N,et al.NGA project strong-motion database[J].Earthquake Spectra,2008,24:23-44
[11]Boore D,Jennie Abrahamson N.Orientation independentmeasures of ground motion[J].Bull.Seismol.Soc.Am.,2006,96:1502-1511
[12]Abrahamson N,Youngs R.A stable algorithm for regressionanalyses using the random effects model[J].Bull.Seismol.Soc.Am.,1992,82:505-510
[13]Campbell K,Bozorgnia Y.Next generation attenuation(NGA)empirical ground motion models:can they be usedin Europe[C]//1st European Conference on EarthquakeEngineering and Seismology Geneva.Switzerland,2006:458
[14]Taheri J S,Naserieh S,Hadi G.A test of the applicabilityof NGA models to the strong ground-motion data in theiranian plateau[J].Journal of Earthquake Engineering,2010,14:278-292
[15]Wang Dong,Xie Lili,Abrahamson N,et al.Comparisonof strong ground motion from the Wenchuan,China,earthquake of 12 May 2008 with the next generationattenuation(NGA)ground motion models[J].Bull.Seismol.Soc.Am.,2010,100:2381-2395
[16]李小军,周正华,于海英,等.汶川8.0级地震强震动观测及记录初步分析[C]//汶川地震建筑震害分析与重建研讨会.北京,2008
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