武都台的地震记录特征及场地条件分析
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摘要
为了探究场地近地表地层结构对强地震动特征的影响机理,本文以武都台为研究对象,岷县基岩台为参考,分析了两个台站在汶川地震序列期间五次强地震的记录特征,并在武都台站附近开展浅层横波地震勘探和地脉动测试。研究表明武都台水平向地震频谱在1-2Hz的振幅最大,是由厚覆盖层底部强波阻抗界面控制的;受土层非线性特征影响,地震作用可能会使场地的响应主频向比其脉动基频更低的频段发展。工程勘察方法获得的场地卓越周期和速度结构与实际强震台址的地震动特征之间存在相关性,因此,联合横波地震勘探和地脉动方法可预测一般地工程场地的地震响应特征。
In order to clarify the influence of near surface structure on the characteristics of strong ground motion,combination of S-wave seismic exploration and microtremor test is conducted in 62 WUD seismic station,where a series of aftershock records are obtained during Wenchuan earthquake sequence. Five of the strong earthquake events are chosen to analyze the characteristics of strong ground motion in 62 WUD and 62 WIX seismic station. The analysis indicates that the largest amplitude of the horizontal Flourier spectra corresponds to 1-2 Hz,which is controlled by the strong impedance of overburden in 62 WUD station; earthquake can make the main frequency of the seismic response lower than microtremor frequency due to the nonlinear nature of soil layer. The predominant period and velocity structure of the seismic station are closely related to the characteristics of seismic resonances,therefore,combination of S-wave seismic exploration and microtremor test can reveal the seismic response in general engineering sites.
引文
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