Comparison of S-wave Velocity Profile Obtained from Surface Seismic Detection and Borehole Data
Building site classification,based on the Vs velocity and the overburden (Vse <500m/s) depth,is a primary procedure in seismic microzonation result from substantial geotechnical investigation.Although credible borehole methods are widely used,studies on use of refraction or reflection methods to characterize the near surface show that these methods have become a valuable tool due to inexpensive and non-invasive nature,especially for our ongoing seismic microzonation project in urban area.In this paper,high-resolution seismic refraction and reflection data were acquired at eight sites to compare with borehole S-wave velocity profiles.We find general agreement occurs in the trends of lower to higher velocity with increasing depth at all sites,and as a result,the refraction and reflection velocity profiles in some cases were more like an average velocity profile when compared to the borehole data.Integrated refraction and reflection can assist in minimizing the velocity inversion problem sometimes;analysis of reflection/refraction and borehole data in this study shows that,despite significant differences in the subsurface area sampled by these two methods,similar velocity structures are determined.The study prove that surface seismic refraction and reflection would be useful to the seismic microzonation,which need a quick category assignment of substantial sites and their reliable velocity structures that can be used to help explain earthquake ground motions.
S-wave seismic refraction/reflection borehole velocity building site classification seismic microzonation
Lu Yuxia Woolery, Edward W Wang, Zhenming Liu Kun Teng Guangliang Sheng Zhiqiang Qiang Zhengyang Li Qian
Key Laboratory of Loess Earthquake Engineering, Gansu Earthquake Administration, CEA, Lanzhou, PRC ; Department of Earth and Environment Sciences, University of Kentucky, KY, USA Kentucky Geological Survey, KY, USA Lanzhou Institute of Seismology, CEA, Lanzhou, PRC
国际会议
长沙
英文
500-504
2012-06-15（万方平台首次上网日期，不代表论文的发表时间）