摘要
基于合作市区41处地脉动观测点数据的快速傅里叶变换和单点H／V频谱分析结果，总结了合作市区场地条件的地脉动特征，并结合钻孔揭示的场地条件资料，反演合作市区的覆盖层厚度。根据合作地区不同局部地形观测数据和数据分析结果，分析了地形对地脉动的放大效应。结果表明：合作市区场地的卓越周期主要分布在0．1～0．2s，与合作市区场地条件相符；2条剖面H／V频谱分布稳定，覆盖层厚度地脉动反演结果与钻孔揭示厚度吻合较好。
First, based on frequency spectral analysis result of microtremor observation data of 41 observation points in Hezuo City by fast Fourier transform （FFT） and horizontal-to-vertical spectral ratio of single point （H/V）, we summarized the ground microtremor characteristic in site condition of Hezuo City. Second, combining the site condition of drill exploration, we inversed the overburden thickness of the Hezuo City. Finally, we ana- lyzed the amplification effect of topography on microtremor combining with the topography observation data in different local area of Hezuo City and its data analysis result. The results show that the predominant period of sites mainly distributes between 0. 1 s and 0. 2 s, which is suitable with site condition in Hezuo. The distribution of H/V frequency spectrum of two profiles is stable and the overburden thickness inversed by microtremor are very close to the real thickness acquired by borehole.
出处
《地震研究》
CSCD
北大核心
2013年第3期337-341,407,共5页
Journal of Seismological Research
基金
中国地震局地震预测研究所基本科研业务费项目(2012IESLZ01)资助
关键词
地脉动
频谱分析
黄土地区
覆盖层
microtremor
frequency spectral analysis
loess region
overburden
