经验格林函数方法理论上的改进
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摘要
以往的经验格林函数方法存在着两个问题:一是要求大小地震需满足"相似"或"准相似"条件,这就限制了经验格林函数方法的适用范围。二是对大地震断层面的位错不均匀性考虑得不充分,而实际上大地震断层的位错一般是不均匀的。本文在假定大小地震不满足"相似"和"准相似"以及大地震断层面位错不均匀的前提下,对经验格林函数方法进行了改进,并应用于卢龙地震的模拟,模拟的结果与记录符合得比较好,说明改进的经验格林函数方法可以用来估计场地地震动过程。
There are two disadvantages in previous empirical Green's function.The one is big and small earthquakes must satisfy "similarity conditions" or "quasi-similarity conditions",which limits the application ranges of this method.The other is there is a lack of consideration about the dislocation's unevenness at large earthquake faults,actually,slip dislocations at earthquake faults for large earthquakes are usually uneven.On the basis of that big and small earthquakes do not satisfy "similarity conditions","quasi-similarity conditions" and the slip dislocations at earthquake faults for large earthquakes are usually uneven.The paper puts forward an improved empirical Green's function,and simulates the ground motion of Lulong with improved method.The simulations with this method accord well with records,so improved empirical Green's function method can be used to estimate ground motion processes.
There are two disadvantages in previous empirical Green's function.The one is big and small earthquakes must satisfy "similarity conditions" or "quasi-similarity conditions",which limits the application ranges of this method.The other is there is a lack of consideration about the dislocation's unevenness at large earthquake faults,actually,slip dislocations at earthquake faults for large earthquakes are usually uneven.On the basis of that big and small earthquakes do not satisfy "similarity conditions","quasi-similarity conditions" and the slip dislocations at earthquake faults for large earthquakes are usually uneven.The paper puts forward an improved empirical Green's function,and simulates the ground motion of Lulong with improved method.The simulations with this method accord well with records,so improved empirical Green's function method can be used to estimate ground motion processes.
引文
[1]Harzell S H.Earthquake aftershock as Green’s function[J]Geophys.R E.let,1978,5(1):1-4.
[2]Irikura K.Semi-empirical estimation of strong ground motions during large earthquakes[J]Bulletin of Disaster Prevention Research Institute,Kyo-to Univ.,1983,33(2):63-104.
[3]Irikura K,Kamae K.Estimation of strong ground motion in broad-frequency band based on a seismic source scaling model and an empirical Green’sfunction technique[J]Annali Di Geofisica,6December1994,VOL.ⅩⅩⅩⅦ,N:1721-1743.
[4]罗奇峰,胡聿贤.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,1990,10(3):1-13.LUO Qifeng,HU Yuxian.An improved empirical Green function method and synthsis of near-field acceleragrams in Lulong earthquake[J].Journalof Earthquake Engineering and Engineering Vibration,1990,10(3):1-13.(in Chinese)
[5]吴迪.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,2008.WU Di.Study on ground motion simulation based on asperity model with simi-empirical method[D].Shanghai:Tongji University,2008.(in Chi-nese)
[6]Haskell N A.Radiation pattern of surface waves from point source in a multi-layered medium[J].BSSA,1964,54(1):377-393.
[7]Miyake H,Iwata T,Irikura K.Source characterization for broadband ground motion simulation kinematic heterogeneous source model and strongmotion generation area[J].BSSA,2003,93(6):2531-2545.
[8]Somerville P G,Irikura K,Graves R,et al.Characterizing earthquake slip models for the prediction of strong ground motion[J]Seism.Res.lett.,1999,70(1):59-80.
[9]Irikura K.Recipe for predicting strong ground motions from future large earthquakes[J].Disaster Prevention Research Institute Annuals,Kyoto U-niversity,2004,47(A):25-45.
[10]李启成,景立平,李中宁.经验格林函数法和随机方法模拟卢龙地震的比较[J].地震工程与工程震动,2009,29(2):13-18.LI Qicheng,JING Liping,LI Zhongning.The comparison of simulated ground motions of Lulong earthquake between empirical Green functionmethod and stochastic method[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(2):13-18.(in Chinese)
[2]Irikura K.Semi-empirical estimation of strong ground motions during large earthquakes[J]Bulletin of Disaster Prevention Research Institute,Kyo-to Univ.,1983,33(2):63-104.
[3]Irikura K,Kamae K.Estimation of strong ground motion in broad-frequency band based on a seismic source scaling model and an empirical Green’sfunction technique[J]Annali Di Geofisica,6December1994,VOL.ⅩⅩⅩⅦ,N:1721-1743.
[4]罗奇峰,胡聿贤.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,1990,10(3):1-13.LUO Qifeng,HU Yuxian.An improved empirical Green function method and synthsis of near-field acceleragrams in Lulong earthquake[J].Journalof Earthquake Engineering and Engineering Vibration,1990,10(3):1-13.(in Chinese)
[5]吴迪.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,2008.WU Di.Study on ground motion simulation based on asperity model with simi-empirical method[D].Shanghai:Tongji University,2008.(in Chi-nese)
[6]Haskell N A.Radiation pattern of surface waves from point source in a multi-layered medium[J].BSSA,1964,54(1):377-393.
[7]Miyake H,Iwata T,Irikura K.Source characterization for broadband ground motion simulation kinematic heterogeneous source model and strongmotion generation area[J].BSSA,2003,93(6):2531-2545.
[8]Somerville P G,Irikura K,Graves R,et al.Characterizing earthquake slip models for the prediction of strong ground motion[J]Seism.Res.lett.,1999,70(1):59-80.
[9]Irikura K.Recipe for predicting strong ground motions from future large earthquakes[J].Disaster Prevention Research Institute Annuals,Kyoto U-niversity,2004,47(A):25-45.
[10]李启成,景立平,李中宁.经验格林函数法和随机方法模拟卢龙地震的比较[J].地震工程与工程震动,2009,29(2):13-18.LI Qicheng,JING Liping,LI Zhongning.The comparison of simulated ground motions of Lulong earthquake between empirical Green functionmethod and stochastic method[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(2):13-18.(in Chinese)
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