卢龙地震动场的预测
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摘要
分别用经验格林函数方法和随机方法对卢龙ML5.7地震的地震动进行模拟对比研究,结果显示:用经验格林函数方法模拟得到的波形和反应谱都与原始记录接近,用该方法模拟的地震动,无需掌握场地的具体情况;对于无小震记录的地区,如果知道了其场地情况与附近有小震记录地区相似,可以用该小震记录作为经验格林函数模拟地震动。对于不能用经验格林函数方法模拟地震动的地区,可以用随机方法模拟地震动。用随机方法模拟地震动具有简单、方便、无需小震记录的优点。根据卢龙场地具体条件,尝试用两种方法结合预测了卢龙地震加速度场,结果比较好地反映了断层周围加速度的峰值分布规律。
We respectively use Empirical Green's Function and stochastic methods to simulate the ground motion of Lulong ML5.7 earthquake.The results show that the waveform and response spectrum simulated by Empirical Green's Function method are consistent with the original recordings,and it needn't master actual conditions of site.If the site condition of study area without the recordings of small earthquakes are similar with its vicinity with the recordings of small earthquakes,we can use the small earthquake recordings as the Empirical Green's Function to simulate the ground motion.In addition,we can use stochastic method to simulate ground motion in the areas that the Empirical Green' Function method can not be used.The stochastic method has advantages of simplicity,convenience and do not need small earthquake recordings.On the basis of actual conditions of Lulong field,we combine the two method to predict the acceleration field of Lulong earthquake.The results reflect the distribution of peak acceleration around the fault.
We respectively use Empirical Green's Function and stochastic methods to simulate the ground motion of Lulong ML5.7 earthquake.The results show that the waveform and response spectrum simulated by Empirical Green's Function method are consistent with the original recordings,and it needn't master actual conditions of site.If the site condition of study area without the recordings of small earthquakes are similar with its vicinity with the recordings of small earthquakes,we can use the small earthquake recordings as the Empirical Green's Function to simulate the ground motion.In addition,we can use stochastic method to simulate ground motion in the areas that the Empirical Green' Function method can not be used.The stochastic method has advantages of simplicity,convenience and do not need small earthquake recordings.On the basis of actual conditions of Lulong field,we combine the two method to predict the acceleration field of Lulong earthquake.The results reflect the distribution of peak acceleration around the fault.
引文
李文军.2004.用余震序列的数字地震资料对卢龙地区活动构造的研究[D].北京:中国地震局地球物理研究所.
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.1989.近场加速度的半经验合成[D].哈尔滨:中国地震局工程力学研究所.
王海云.2004.近场强地震动预测的有限断层震源模型[D].哈尔滨:中国地震局工程力学研究所.
闻学泽.1999.中国大陆活动断裂的段破裂地震复发间隔的经验分布[J]地震学报,2l(6):616-622.
薛志照.1986.唐山地震震源深度分布与地壳结构的关系[J].地震地质,8(3):69-78.
张国民,钮凤林,召志刚.2009.帕克菲尔德地震预报实验场:2004年6级地震及其对地震物理和地震预测研究的影响[J].中国地震,25(4):345-355.
Aki K,Richards P G.1980.Quantitative Seismology:Theory and Methods[M].New York:W H Freeman&Co Ltd.
Boore D M.2003.Simulation of ground motion using the stochastic method[J].Pure Appl Geophys,160(3-4):635-676.
Hartzell S H.1978.Earthquake aftershock as Green's function[J].Geophys R E let,5(1):1-4.
Motazedian,Atkinson.2005.Stochastic finite-fault modeling based on adynamic corner frequency[J]BSSA,95(3):995-1010.
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.1989.近场加速度的半经验合成[D].哈尔滨:中国地震局工程力学研究所.
王海云.2004.近场强地震动预测的有限断层震源模型[D].哈尔滨:中国地震局工程力学研究所.
闻学泽.1999.中国大陆活动断裂的段破裂地震复发间隔的经验分布[J]地震学报,2l(6):616-622.
薛志照.1986.唐山地震震源深度分布与地壳结构的关系[J].地震地质,8(3):69-78.
张国民,钮凤林,召志刚.2009.帕克菲尔德地震预报实验场:2004年6级地震及其对地震物理和地震预测研究的影响[J].中国地震,25(4):345-355.
Aki K,Richards P G.1980.Quantitative Seismology:Theory and Methods[M].New York:W H Freeman&Co Ltd.
Boore D M.2003.Simulation of ground motion using the stochastic method[J].Pure Appl Geophys,160(3-4):635-676.
Hartzell S H.1978.Earthquake aftershock as Green's function[J].Geophys R E let,5(1):1-4.
Motazedian,Atkinson.2005.Stochastic finite-fault modeling based on adynamic corner frequency[J]BSSA,95(3):995-1010.
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