Application of passive source surface-wave method in site engineering seismic survey  

作　　者：Chaofan Wang Jian Zhang Lihui Yan Hui Liu Dong Zhao 

机构地区：[1]Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences [2]College of Earth Science, University of Chinese Academy of Sciences [3]North China Institute of Geological Engineering Co. Ltd. [4]Geogiga Technology Corp.

出　　处：《Earthquake Science》2014年第1期101-106,共6页地震学报（英文版）

基　　金：supported by National Natural Science Foundation of China (No. 41174085);Chinese Academy of Sciences (KZZD-EW-TZ-19);China Geological Survey (12120113101400)

摘　　要：Site engineering seismic survey provides basic data for seismic effect analysis. As an important parameter of soil, shear-wave velocity is usually obtained through wave velocity testing in borehole. In this paper, the passive source surface-wave method is introduced into the site engineering seismic survey and practically applied in an engineering site of Shijingshan District. By recording the ubiquitous weak vibration on the earth surface, extract the dispersion curve from the surface-wave components using the SPAC method and obtain the shear-wave velocity structure from inversion. Over the depth of 42 m under- ground, it totally consists of five layers with interface depth of 3.31, 4.50, 7.23, 17.41, and 42.00 m; and shear-wave velocity of 144.0, 198.3, 339.4, 744.2, and 903.7 m/s, respectively. The inversion result is used to evaluate site classification, determine the maximum shear modulus of soil, provide basis for further seismic hazard analysis and site assessment or site zoning, etc. The result shows that the passive source surface-wave method is feasible in the site engineering seismic survey and can replace boreholes,shorten survey period, and reduce engineering cost to some extent.Site engineering seismic survey provides basic data for seismic effect analysis. As an important parameter of soil, shear-wave velocity is usually obtained through wave velocity testing in borehole. In this paper, the passive source surface-wave method is introduced into the site engineering seismic survey and practically applied in an engineering site of Shijingshan District. By recording the ubiquitous weak vibration on the earth surface, extract the dispersion curve from the surface-wave components using the SPAC method and obtain the shear-wave velocity structure from inversion. Over the depth of 42 m under- ground, it totally consists of five layers with interface depth of 3.31, 4.50, 7.23, 17.41, and 42.00 m; and shear-wave velocity of 144.0, 198.3, 339.4, 744.2, and 903.7 m/s, respectively. The inversion result is used to evaluate site classification, determine the maximum shear modulus of soil, provide basis for further seismic hazard analysis and site assessment or site zoning, etc. The result shows that the passive source surface-wave method is feasible in the site engineering seismic survey and can replace boreholes,shorten survey period, and reduce engineering cost to some extent.

关 键 词：Passive source surface-wave method Shearwave velocity Dispersion curve Seismic effect Engineering seismic survey 

分 类 号：P631.4[天文地球—地质矿产勘探]