汶川8.0级地震断层下盘基岩衰减关系分析
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摘要
选取汶川8.0级特大地震位于断层下盘中的32个台站的强震记录,其中20个为土层台,12个为基岩台。首先,利用一维等效线性方法从土层台水平向强震记录反演出基岩水平向地震时程。随后进行了回归统计分析,给出了此次地震的下盘基岩水平向地震动峰值加速度和反应谱衰减关系。最后将所得结果与其他衰减关系对比分析,通过分析得出所得衰减关系揭示了汶川地震的下盘基岩衰减特性,该衰减关系是合理的,为分析汉源烈度异常确定输入地震动提供了基础数据。
Strong motion records at 32 observation stations from Wenchuan 8. 0 earthquake in 2008 were selected,in which 20 observation stations site conditions are soil and the others are bedrock. First,we inversed horizontal earthguake time history of the bedrock from horizontal strong motion records of the observations on soil site by use of 1-D equivalent linearization wave motion method. Then,regressive statistical analysis was carried out to give the attenuation relationship of peak horizontal seismic acceleration and response spectrm of footwall bedrock of the earthguake. Finally,The attenuation relationships were compared with that from other analyes. Results show that the attenuation models propased in this paper reveal characteristics of footwall bedrock attenuation,they are reasonable.It may provide basic data for determining the input ground motion that is used for analysis of Hanyuan abnormal intensity.
Strong motion records at 32 observation stations from Wenchuan 8. 0 earthquake in 2008 were selected,in which 20 observation stations site conditions are soil and the others are bedrock. First,we inversed horizontal earthguake time history of the bedrock from horizontal strong motion records of the observations on soil site by use of 1-D equivalent linearization wave motion method. Then,regressive statistical analysis was carried out to give the attenuation relationship of peak horizontal seismic acceleration and response spectrm of footwall bedrock of the earthguake. Finally,The attenuation relationships were compared with that from other analyes. Results show that the attenuation models propased in this paper reveal characteristics of footwall bedrock attenuation,they are reasonable.It may provide basic data for determining the input ground motion that is used for analysis of Hanyuan abnormal intensity.
引文
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[2]李春峰,赵金宝,唐晖.台湾集集大地震及其余震长周期地震动特性[J].地震学报,2006,28(4):417-428.LI Chunfeng,ZHAO Jinbao,TANG Hui.Long-period ground motion characteristics of 1999 Chi-Chi Tanwanmainshock and aftershocks[J].ACTA Seismologica Sinica,2006,28(4):417-428.(in Chinese)
[3]David M B,William B J,Thomas E F.Equations for estimating horizontal response spectra and peak acceleration from western north American earthquake:a summary of recent work[J].Seismological Research Letters,1997,68:128-153.
[4]Kenneth W.Campbell near-source attenuation of peak horizontal acceleration[J].Bull.Seism.Soc.Am.1981,71:2039-2070.
[5]Somerville,Smith,Graves.Modification of empirical strong ground motion attenuation relations to include the amplitude and duration effects offrupture directivity[J].Seism.Res.Lett.1997,68(1):199-222.
[6]Trifunac M D.Pesudorelative velocity spectra of earthquake ground-motion at long period[J].Soil Dynamics Earthquake Engineering,1995,14:331-34.
[7]俞言祥,汪素云.青藏高原东北地区水平向基岩加速度峰值与反应谱衰减关系[J].地震学报,2004,26(6):591-600.YU Yanxiang,WANG Suyun.Attenuation relations for horizontal peak ground acceleration and response spectrum in Northeastern Tibetan Plateau Region[J].ACTA Seismologica Sinica,2004,26(6):591-600.(in Chinese)
[8]俞言样,汪素云.中国东部和西部地区水平向基岩加速度反应谱衰减关系[J].震灾防御技术,2006,1(3):206-216.YU Yanxiang,WANG Suyun.Attenuation relations for horizontal peak ground acceleration and response spectrum in Easter and Western China[J].Technology for Earthquake Disaster Prevention,2006,1(3):206-216.(in Chinese)
[9]康兰池,金星.四川地区地震动峰值衰减规律研究[J].地震学报,2009,31(4):403-410.KANG Lanchi,JIN Xing.Ground motion attenuation relation for small tomoderate earthquakes in Sichuan region[J].ACTA Seismologica Sinica,2009,31(4):403-410.(in Chinese)
[10]Abrahamson N A.Near-fault ground motion from the 1999 Chi-Chi earthquake.[C]//Proc.Of U.S.Japan Workshop on the effects of near-field earthquake shaking,San Francisco,California,2000.
[11]Abrahamson N A,Silva.Empirical response spectral attenuation relations for shallow crustal earthquake[J].Seism.Res.Lett.1997,68:94-127.
[12]刘浪.汶川地震地震动衰减特性分析[D].哈尔滨:中国地震局工程力学研究所,2010.LIU Lang.Analysisaboutcharacteristics of Ground Motion Attenuation of Wenchuan Earthquake[D].Haerbin:Earthquake Administration Institute of Engineering Mechanics,2010.(in Chinese)
[13]廖振鹏,李小军.地表土层地震反应的等效线性化解法:地震小区划[M].北京:地震出版社,1989:141-153.LIAO Zhenpeng,LI Xiaojun.Linearization Method for Computing Earthquake Response of Ground Layered Soil:Seismicmicrozonation[M].Bcijing:Seismological Press,1989.(in Chinese)
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