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为获取北京城区的地震动场地响应资料,2007年夏天在北京市开展了脉动背景噪声的阵列观测.利用北京市五环内间距1～2km的600多个点位的地脉动观测记录,采用H/V谱比分析法得到了北京城区高分辨的沉积层卓越频率和放大倍数及沉积盖层厚度分布.本文结果与地表地形和新构造运动的分布较为相符,得到的沉积盖层厚度与早期基于有限钻孔资料给出结果总体上较为一致,但分辨精度明显提高.这些结果为北京市规划和抗震设防提供了重要的科学基础资料,为城市地球物理探测获取地下三维结构资料探索了可行的途径。
In order to obtain the response data of the earthquake ground in Beijing urban area, an array of pulsation background noise was conducted in Beijing in summer 2007. Based on the ground-truth observation records of more than 600 sites with the distance 1 ~ 2km within the Fifth Ring of Beijing, H / V spectral ratio analysis of the high-resolution sedimentary layer in Beijing city excellent frequency and magnification and sedimentary cover thickness distribution.The results of this paper and the distribution of surface topography and neotectonic movement is more consistent with the thickness of the sedimentary cover and early based on The results of finite borehole data are generally consistent, but the accuracy of resolution is obviously improved.These results provide important scientific basis for planning and seismic fortification of Beijing city, and explore feasible ways for obtaining the three-dimensional underground structure data of urban geophysical exploration .