基于谱比法的江苏强震动台站场地特征分析

选取江苏省强震动台网近年来获得的强震动记录,基于水平竖向谱比法(HVSR),计算了22个强震动台站的速度反应谱平均谱比曲线,采用谱比形状一致法进行场地分类,并结合典型台站场地的工程地质资料进行对比分析。研究结果表明,平均谱比曲线的卓越周期、场地放大等特征与台站场地地质资料相吻合,与传统场地分类方法相比,基于谱比法的场地特征分类方法能够突出不同场地的地震动反应特征,较好地体现了台站的场地反应特征。

Analysis of Site Characteristics for Strong Motion Stations in Jiangsu Province by Using Spectral Ratio Method

In recent years,the strong motion network has obtained lots of records in Jiangsu Province. The spectral ratio curves of velocity response of strong motions from 22 stations are calculated by using horizontal vertical spectral ratio method in this paper. The site types of stations are classified by using the predominant period and spectral type characteristics of the curves,which are also compared with the engineering geological data of four typical strong motion stations. Compared with the traditional site classification method,our results show that the site feature classification based on the spectral ratio method can highlight the seismic response characteristics of different sites. The predominant period and amplification characteristics of the spectral ratio curve are consistent with the site geological data,which reflects the site response characteristics of the station better.