%0 Journal Article
%T VALIDATION OF MICROTREMORS ARRAY METHOD<br>地脉动台阵方法的有效性分析
%A SHI Lijing
%A TAO Xiaxin
%A ZHAO Jisheng
%A <br>师黎静
%A 陶夏新
%A 赵纪生
%J 岩石力学与工程学报
%D 2006
%I 
%X By the microtremors array observation and velocity structure inversion in the field of an engineering project,the accuracy of microtremors array methods(MAM) for exploring the detailed shallow velocity structure is studied with observation system,dispersion curve extraction and inversion methods. The shallow S-wave velocity structure is inversed by the hybrid method of genetic algorithm(GA) and simplex algorithm(SA) from the surface wave dispersion curve,which is inferred by the spatial auto-correlation method(SAC) from microtremors array records. The studies show that the relative average error of each layer is about 20% compared with that detected by borehole method. The average velocity obtained by SAC method and frequency wave-number method(F-K) is almost the same. However,F-K method only gives an average velocity for the upper 20-meter layer. The accuracy is compared with that of spectral analysis of surface wave(SASW) method. In the fields of geotechnical engineering and earthquake engineering,the direct goal of velocity structure exploration is site dynamic characterization. From the viewpoint of site seismic responses,the accuracy of MAM is further validated by 1D equivalent linearized analysis. The analytical results show that the difference between the response spectra from inversed velocity structure and that measured in borehole is really acceptable,whereas that for the simplified single layer model with the average velocity is quite large. The study suggests that it is not a good idea in seismicdesign to characterize site condition only by the average velocity;and the MAM has the potential to be an effective method for the shallow velocity structure exploration.
%K earthquake engineering
%K S-wave velocity structure
%K shallow layer
%K microtremors
%K array observation
%K site response<br>地震工程
%K 剪切波速结构
%K 浅部
%K 地脉动
%K 台阵观测
%K 场地反应
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=D3421FAA1A0A0F0C&jid=35E747D791A1346351AFB523B7FA35CB&aid=4F0044D39520BFF5&yid=37904DC365DD7266&vid=C5154311167311FE&iid=5D311CA918CA9A03&sid=E652F68A3FDC0E89&eid=721F8E311AAA0176&journal_id=1000-6915&journal_name=岩石力学与工程学报&referenced_num=0&reference_num=12