基于HVSR方法的上海市典型场地特征研究  

Typical features of sites in Shanghai based on HVSR method

作　　者：赵鹏[1,2] 韦晓 胡峻[1,2] ZHAO Peng;WEI Xiao;HU Jun(Shanghai Earthquake Administration,Shanghai 200062,China;Shanghai Sheshan National Geophysical Observatory,Shanghai 200062,China;Chongqing Earthquake Agency,Chongqing 401147,China)

机构地区：[1]上海市地震局,上海200062 [2]上海佘山地球物理国家野外科学观测研究站,上海200062 [3]重庆市地震局,重庆401147

出　　处：《振动与冲击》2024年第11期312-319,共8页Journal of Vibration and Shock

基　　金：上海市佘山地球物理国家野外观测研究站研究室课题(2023SSY01);上海市科委课题(20dz1200500)。

摘　　要：上海市强震台网获取了2020年5月3日日本九州6.0级地震等多次强震记录。通过对地震记录进行分析处理,分别计算了每个强震台站的H/V谱比曲线,结合上海市地质调查研究院的基岩埋深分布图,得到了每个台站的基阶共振频率与沉积层厚度。结果表明:H/V谱比曲线峰值与沉积层厚度存在明显相关性,并且通过数据拟合建立了上海市沉积层厚度与基阶共振频率的经验公式,绘制了上海市场地基本周期分布图,可以为上海市抗震设防提供一定的参考;厚沉积层场地上地震记录的谱比曲线会出现多个峰值,第二个峰值代表了沉积层的高阶共振频率;通过数据拟合得到上海地区剪切波速与沉积层厚度的经验公式。Shanghai Strong Earthquake Network obtained multiple strong earthquake records including 6.0 magnitude earthquake in Kyushu,Japan on May 3,2020.By analyzing and processing seismic records,H/V spectral ratio(HVSR)curves of various strong earthquake stations were calculated.Combined with the distribution map of bedrock burial depth published by Shanghai Geological Survey and Research Institute,the fundamental resonance frequency and sedimentary layer thickness of each station were obtained.The results showed that there is an obvious correlation between peak value of HVSR curve and sedimentary layer thickness;the empirical formula for sedimentary layer thickness versus fundamental resonance frequency in Shanghai is established with data fitting,and a fundamental period distribution map of Shanghai sites is drawn to provide a certain reference for aseismic fortification in Shanghai;HVSR curve of seismic records on site with thick sedimentary layer can have multiple peaks,the 2nd peak value represents high-order resonance frequency of sedimentary layer;the empirical formula for shear wave velocity versus sedimentary layer thickness in Shanghai area is obtained with data fitting.

关 键 词：H/V谱比(HVSR) 共振频率 沉积层厚度 强震记录 

分 类 号：TU413.5[建筑科学—岩土工程]