体波地脉动单点谱比法研究
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摘要
采用弹性成层介质模型,应用概率分析方法,推导地下体波斜入射成层介质,在自由表面形成体波地脉动的水平分量与竖向分量谱比表达式。然后,通过大量模型计算,论证体波斜入射单层覆盖半空间形成地脉动水平分量与竖向分量谱比特性与场地传递函数间的关系。结果表明,利用地脉动单点谱比法分析体波为主要成分地脉动时,与场地水平向传递函数相比,可以得到较准确阻抗比大于3的场地卓越频率和偏小的场地放大因子。
The spectral ratio method抯 rationality of horizontal to vertical component (H/V method) for microtremors is discussed by an elastic layer over a half-space and probability model. The H/V expressions of body microtremors for layered media are derived. The feasibility of estimating the horizontal transfer function from H/V of microtremors is discussed. It is shown that the spectral ratio method of horizontal to vertical component can be used to estimate the site predominant frequency for body microtremors when the impedance ratio is more than 3. However the amplification factor of this method is smaller compared with site horizontal transfer function.
The spectral ratio method抯 rationality of horizontal to vertical component (H/V method) for microtremors is discussed by an elastic layer over a half-space and probability model. The H/V expressions of body microtremors for layered media are derived. The feasibility of estimating the horizontal transfer function from H/V of microtremors is discussed. It is shown that the spectral ratio method of horizontal to vertical component can be used to estimate the site predominant frequency for body microtremors when the impedance ratio is more than 3. However the amplification factor of this method is smaller compared with site horizontal transfer function.
引文
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[11]郭明珠.地脉动波场分析及其在场地动力特性测试中的应用.[博士学位论文D],北京:中国地震局工程力学所,2000.
[2]FieldE,JacobK.The theoretical research response of sedimentary layers to ambient seismic noise[?].GeophysicalResearchLetters[?],1993,20(24):2925-2928.
[3]FieldE,JacobK,A comparison and test of various site-response estimation techniques, including three that are not reference-site dependent[J].Bull.Seism.Soc.Am.1995,85(4),1127-1143.
[4]BardP.Microtremors measurements: a tool for site effect estimation[Z].ESG 98 symposium.1998.
[5]LachetC,BardP.Numerical and theoretical investigations on the possibilities and limitations of theNakamuras technique[J].Journal ofPhysics of theEarth.1994,42,377-397.
[6] kudo k.Practical estimates of site response: state of the art.Report proceding of theFifthInternationacConf.SeismicZonation,1995,1878-1906.
[7]Nakamura.Clear identification of fundamental idea ofNakamura technique and its applications[R].2000,12WCEE,#2656.
[8]郭明珠,宋泽清.论地脉动场地特性分析中的“Nakamura法”[J].世界地震工程,2000(2):88-92.
[9]傅淑芳,刘宝诚.地震学教程[M].地震出版社,1991.
[10]ZhaoB M,Horike andTakeuchiY.Comparison of spatial variation between microtremors and seismic motion[R].1996,11WCEE,#133.
[11]郭明珠.地脉动波场分析及其在场地动力特性测试中的应用.[博士学位论文D],北京:中国地震局工程力学所,2000.
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