西南交通大学学报2025，Vol.60Issue(2)：290-298,9.DOI:10.3969/j.issn.0258-2724.20230094
线性法修正HVSR的场地效应研究
Site Effects of Linear Method and Modified Horizontal-to-Vertical Spectral Ratio
摘要
Abstract
In order to further study the influence of site effects from engineering ground motion,a comparative analysis of site effects from ground motion in the Sichuan strong earthquake area was carried out based on two empirical methods,namely,horizontal-to-vertical spectral ratio(HVSR)and linear inversion.Firstly,233 sets of strong motion waveforms captured by 17 strong motion stations during the aftershocks of the Wenchuan Earthquake were selected based on the magnitude,station,distance from the epicenter,and other factors.Second,the linear inversion method was used to estimate the quality factor Qs of the S-wave based on the hinged three-stage attenuation model in the Longmenshan area.Meanwhile,two methods,rotational HVSR and multidirectional HVSR,were applied to explain the mechanism of the site effect of azimuthal angle on HVSR in seismic wave propagation.Finally,the possible reasons for the variability of the site effects calculated by the linear inversion and HVSR methods were analyzed,based on which an improved HVSR method was proposed to improve the accuracy of the site effect assessment.The results show that the quality factor of the S-wave in the area is frequency-dependent and approximately equals to 199.2f0.8 in the range of 0.4-20.0 Hz.The results of HVSR may have a certain dominant direction,and the site effect may increase suddenly at a certain angle with the change of the azimuthal angle,which may be related to the anisotropy of the soil layer at the site.The amplification of vertical ground motion,i.e.,the vertical site effect formed by the coupling of soil layer at the site,engineered bedrock,or middle and deep hard rock layers,is the main reason for the difference between HVSR and linear inversion methods.关键词
场地效应/Qs值/线性反演法/HVSR法/方位角Key words
site effects/Qs value/linear inversion/HVSR method/azimuthal angle分类
天文与地球科学引用本文复制引用
陈学良,陈科霖,兰景岩,李兴哲..线性法修正HVSR的场地效应研究[J].西南交通大学学报,2025,60(2):290-298,9.基金项目
国家重点研发计划(2023YFC3007305,2019YFC1509403) （2023YFC3007305,2019YFC1509403）
国家自然科学基金项目(51978633,51678537) 感谢中国地震局工程力学研究所强震动观测中心为本研究提供的数据支持 （51978633,51678537）
感谢研究所专项基金(DQJB24Z01、DQJB24R31、DQJB22Z03、DQJB21Z15)为本研究提供联合资助. （DQJB24Z01、DQJB24R31、DQJB22Z03、DQJB21Z15）
