地震研究

卢龙地震动场的预测^*

李启成,池红岩,宋志勇

(黑龙江科技学院,黑龙江哈尔滨 150027)

关键词：地震动; 卢龙; 随机方法; 经验格林函数

Prediction of Ground Motion Field in Lulong

LI Qi-cheng,CHI Hong-yan,Song Zhi-yong

(Heilongjiang Institute of Science and Technology,Heilongjiang 150027,Harbin,China)

Keywords：ground motion; Lulong; stochastic method; Empirical Green's Function

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参考文献

分别用经验格林函数方法和随机方法对卢龙M_L5.7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 M_L5.7 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.

引言
1 地震动的模拟方法
2 用经验格林函数方法模拟卢龙地震动
3 用随机方法模拟卢龙地震动
4 卢龙地区地震动场的模拟
5 结论

表1 两次地震的相关参数<br/>Tab.1 Related parameters of two earthquakes

表1 两次地震的相关参数
Tab.1 Related parameters of two earthquakes

图1 卢龙ML4.2余震南北方向加速度记录<br/>Fig.1 N-S component acceleration record of Lulong ML4.2 aftershock

图1 卢龙ML4.2余震南北方向加速度记录
Fig.1 N-S component acceleration record of Lulong ML4.2 aftershock

图2 卢龙ML5.7地震南北方向记录及模拟的加速度时程<br/>Fig.2 N-S component waveform of the Lulong ML5.7 earthquake and its acceleration time history simulated by Empirical Green's Function

图2 卢龙ML5.7地震南北方向记录及模拟的加速度时程
Fig.2 N-S component waveform of the Lulong ML5.7 earthquake and its acceleration time history simulated by Empirical Green's Function

图3 卢龙ML5.7地震南北向记录<br/>及模拟的加速度反应谱比较<br/>Fig.3 Comparison between the N-S component acceleration response spectrum and the simulated one of the Lulong ML5.7 earthquake

图3 卢龙ML5.7地震南北向记录
及模拟的加速度反应谱比较
Fig.3 Comparison between the N-S component acceleration response spectrum and the simulated one of the Lulong ML5.7 earthquake

图4 卢龙ML4.2余震东西方向加速度记录<br/>Fig.4 E-W component acceleration record of Lulong ML4.2 aftershock

图4 卢龙ML4.2余震东西方向加速度记录
Fig.4 E-W component acceleration record of Lulong ML4.2 aftershock

图5 卢龙ML5.7地震东西方向记录<br/>及模拟的加速度时程<br/>Fig.5 E-W component waveform of the Lulong ML5.7 earthquake and its acceleration time history simulated by Empirical Green's Function

图5 卢龙ML5.7地震东西方向记录
及模拟的加速度时程
Fig.5 E-W component waveform of the Lulong ML5.7 earthquake and its acceleration time history simulated by Empirical Green's Function

图6 卢龙ML5.7地震东西方向记录<br/>及模拟加速度反应谱的比较<br/>Fig.6 Comparison between the E-W component acceleration response spectrum and the simulated one of the Lulong ML5.7 earthquake

图6 卢龙ML5.7地震东西方向记录
及模拟加速度反应谱的比较
Fig.6 Comparison between the E-W component acceleration response spectrum and the simulated one of the Lulong ML5.7 earthquake

图7 卢龙及附近地区地壳介质分布(薛志照,1986)<br/>Fig.7 Crustal media distribution in Lulong and its surrounding area(Xue,1986)

图7 卢龙及附近地区地壳介质分布(薛志照,1986)
Fig.7 Crustal media distribution in Lulong and its surrounding area(Xue,1986)

表2 卢龙地震参数<br/>Tab.2 Parameters of Lulong earthquake

表2 卢龙地震参数
Tab.2 Parameters of Lulong earthquake

图8 用随机方法动力学拐角频率模拟卢龙地震水平向与东西向记录的加速度时程对比<br/>Fig.8 Acceleration time history comparison between the E-W component and the horizontal simulation by dynamic corner frequency in stochastic method of Lulong ML 5.7 earthquake

图8 用随机方法动力学拐角频率模拟卢龙地震水平向与东西向记录的加速度时程对比
Fig.8 Acceleration time history comparison between the E-W component and the horizontal simulation by dynamic corner frequency in stochastic method of Lulong ML 5.7 earthquake

图9 用随机方法动力学拐角频率模拟卢龙地震水平向加速度反应谱与记录反应谱对比<br/>Fig.9 Response spectrum comparison between the E-W component and the horizontal simulation by dynamic corner frequency in stochastic method of Lulong ML5.7 earthquake

图9 用随机方法动力学拐角频率模拟卢龙地震水平向加速度反应谱与记录反应谱对比
Fig.9 Response spectrum comparison between the E-W component and the horizontal simulation by dynamic corner frequency in stochastic method of Lulong ML5.7 earthquake

图10 卢龙行政区和观测点位置<br/>Fig.10 Administrative region of Lulong and the position of observational points

图10 卢龙行政区和观测点位置
Fig.10 Administrative region of Lulong and the position of observational points

图11 用经验格林函数法模拟观测点东西向地震动时程(a)测点37;(b)测点38;(c)测点39<br/>Fig.11 E-W component ground motion time history records simulated by Empirical Green's Function at observational points

图11 用经验格林函数法模拟观测点东西向地震动时程(a)测点37;(b)测点38;(c)测点39
Fig.11 E-W component ground motion time history records simulated by Empirical Green's Function at observational points

图12 用随机方法模拟观测点水平向地震动时程(a)测点21;(b)测点17;(c)测点1<br/>Fig.14 Horizontal ground motion time history records simulated by stochastic method recorded at observational points

图12 用随机方法模拟观测点水平向地震动时程(a)测点21;(b)测点17;(c)测点1
Fig.14 Horizontal ground motion time history records simulated by stochastic method recorded at observational points