用随机方法模拟唐山7.1级余震地震动场

Ground motion field simulation of Tangshan MS7.1 aftershock with stochastic method

在系统介绍用随机方法模拟地震动的基础上,用该方法模拟了唐山7.1级余震地震动场。模拟结果表明,唐山地区发生MS7.1级余震时,该地区产生了强烈的地震动,很多区域加速度峰值超过400cm/s2,地震断层面长65km,宽13.5km,地震过程中断层面的平均滑动为1.08m。模拟与记录的地震动持时符合得不好,其原因是随机方法中的经验关系大都是在美国大陆得到的,所以建议加强中国大陆相应的地震动经验关系的研究,使随机方法能更好地适用于中国大陆。尽管如此,由于用随机方法模拟的地震动峰值和反应谱与记录符合得比较好,这些模拟结果可以作为建筑物抗震设防的地震动输入。

Based on the systematic introduction of ground motion simulation with sto- chastic method, the ground motion fields of Tangshan Ms7.1 aftershock was; simulated with this method. Results show that the strong ground motion produced in Qian＇ an region when earthquake （Ms7.1） took place. Peak acceleration exceeds 400 cm/s2. The fault is 65 km long, 13.5 km wide, and its average slip is 1.08 m. The simulated seismic duration do not accord with that of the real records. The reason may lie in that the experiential relations used in simulation were got from the American continent. Therefore, it is suggested that experi- mental relations for Chinese continent should be studied. However, the peak acceleration and response spectrum obtained by simulation are in good agreement wflh real records, which can be used as the seismic motion input of anti-seismic design of construction.