卢龙地震动场的预测*

(黑龙江科技学院,黑龙江 哈尔滨 150027)

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)

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

备注

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.