Estimation of damping ratio of soil sites using microtremor

Guo Xun (郭迅)¹ , Y.L.Wong (黄玉龍)² and Yuan Yifan(袁一凡)¹

Institute of Engineering Mechanics, China Seismological Bureau, Harbin 150080,China;
Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China

Abstract: It is widely known that the seismic response characteristics of a soil site depends heavily on several key dynamic properties of the soil stratum, such as predominant frequency and damping ratio. A widely used method for estimating the predominant frequency of a soil site by using microtremor records, proposed by Nakamura, is investigated to determine its effectiveness in estimating the damping ratio. The authors conducted some microtremor measurements of soil sites in Hong Kong and found that Nakamura’s method might also be used to estimate the damping ratio of a soil site. Damping ratio data from several typical soil sites were obtained from both Nakamura’s ratio curves using the half power point method and resonant column tests. Regression analysis indicates that there is a strong correlation between the damping ratios derived from these two different approaches.

Keywords: microtremor; predominant frequency; damping ratio