基于改进的经验格林函数方法的地震动模拟
|
摘要
改进的经验格林函数方法弃掉以往完全用经验方法确定用于合成大震的小震数目的方法,考虑了大地震断层各个子断层位错的不均匀性,使得经验格林函数方法的物理意义更加清楚。用改进的经验格林函数方法,以汶川MS6.4余震记录作为经验格林函数模拟了九寨白河台、松潘安宏台、皋兰台和成都中和4个台站的加速度时程,与以往的经验格林函数方法比较,模拟结果的反应谱与记录符合得更好,证明了改进的经验格林函数方法可以反映震源位错的复杂分布,可以在工程地震中用来估计场地地震动过程。
The improved Empirical Green's Function method considers the displacement heterogeneity at each sub-faults of fault of main shock,makes the physical meaning of Empirical Green's Function method clearly,and abandons previous empirical method which confirms small earthquake numbers used to synthesize main shock. We use Wenchuan MS6.4 aftershock records as the Empirical Green's function,and simulate the acceleration time histories at Baihe Station in Jiuzhai County,Anhong Station in Songpan Country,Gaolan Station and Zhonghe Station in Chengdu by the improved Empirical Green's function method. Compared with former results by Empirical Green's function method,response spectrums in the simulation results are more closer to the records,which prove the complicated distributions of epicenter displacements can be reflected by the improved Empirical Green's function method,this method can be used to estimate site ground motion processes in engineering seismology.
The improved Empirical Green's Function method considers the displacement heterogeneity at each sub-faults of fault of main shock,makes the physical meaning of Empirical Green's Function method clearly,and abandons previous empirical method which confirms small earthquake numbers used to synthesize main shock. We use Wenchuan MS6.4 aftershock records as the Empirical Green's function,and simulate the acceleration time histories at Baihe Station in Jiuzhai County,Anhong Station in Songpan Country,Gaolan Station and Zhonghe Station in Chengdu by the improved Empirical Green's function method. Compared with former results by Empirical Green's function method,response spectrums in the simulation results are more closer to the records,which prove the complicated distributions of epicenter displacements can be reflected by the improved Empirical Green's function method,this method can be used to estimate site ground motion processes in engineering seismology.
引文
郭祥云,陈学忠,李艳娥,等.2010.2008年5月12日四川汶川8.0级地震与部分余震的震源机制解[J].地震,30(1):50-60.
李启成.2010.经验格林函数方法模拟地震动研究[D].哈尔滨:中国地震局工程力学研究所.
刘启方.2005.基于运动学和动力学震源模型的近断层地震动研究[D].哈尔滨:中国地震局工程力学研究所.
罗奇峰,胡聿贤.1990.改进的经验格林函数法和卢龙近场加速度合成[J].地震工程与工程振动,10(3):1-13.
吴迪.2008.基于凸凹体模型的地震动半经验合成研究[D].上海:同济大学.
张勇,冯万鹏,许力生,等.2008.2008年汶川大地震的时空破裂过程[J].中国科学(D辑:地球科学),38(10):1186-1198.
Dalguer L A,Miyake H,Day S M,et al.2008.Surface Rupturing and Bur-ied Dynamic-Rupture Models Calibrated with Statistical Observationsof Past Earthquakes[J].BSSA,98(3):11471161.
Irikura K,Kamae K.1994.Estimation of strong ground motion in broad-frequency band based on a seismic source scaling model and an em-pirical Green's function technique[J].ANNALI DI GEOFISICA,ⅩⅩⅩⅦ(6):1721-1743.
Irikura K.1986.Prediction of strong acceleration motion using empiricalGreen's function[C]//Proc7th Japan Earthquake Symp.Japan:To-key,151156.
Irikura K.2004.Recipe for predicting strong ground motions from futurelarge earthquakes[J].Disaster Prevention Research Institute Annu-als,Kyoto University,47(A):2545.
Pacheco J F,Scholz C H,Sykes L R.1992.Changes in frequency-size re-lationship from small to large earthquakes[J].Science,355(6355):7173.
李启成.2010.经验格林函数方法模拟地震动研究[D].哈尔滨:中国地震局工程力学研究所.
刘启方.2005.基于运动学和动力学震源模型的近断层地震动研究[D].哈尔滨:中国地震局工程力学研究所.
罗奇峰,胡聿贤.1990.改进的经验格林函数法和卢龙近场加速度合成[J].地震工程与工程振动,10(3):1-13.
吴迪.2008.基于凸凹体模型的地震动半经验合成研究[D].上海:同济大学.
张勇,冯万鹏,许力生,等.2008.2008年汶川大地震的时空破裂过程[J].中国科学(D辑:地球科学),38(10):1186-1198.
Dalguer L A,Miyake H,Day S M,et al.2008.Surface Rupturing and Bur-ied Dynamic-Rupture Models Calibrated with Statistical Observationsof Past Earthquakes[J].BSSA,98(3):11471161.
Irikura K,Kamae K.1994.Estimation of strong ground motion in broad-frequency band based on a seismic source scaling model and an em-pirical Green's function technique[J].ANNALI DI GEOFISICA,ⅩⅩⅩⅦ(6):1721-1743.
Irikura K.1986.Prediction of strong acceleration motion using empiricalGreen's function[C]//Proc7th Japan Earthquake Symp.Japan:To-key,151156.
Irikura K.2004.Recipe for predicting strong ground motions from futurelarge earthquakes[J].Disaster Prevention Research Institute Annu-als,Kyoto University,47(A):2545.
Pacheco J F,Scholz C H,Sykes L R.1992.Changes in frequency-size re-lationship from small to large earthquakes[J].Science,355(6355):7173.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心