Based on the ambient noise horizontal to vertical spectral ratio (HVSR) technique and dense seismic array observations, combined with geological borehole data, an empirical formula for estimating sedimentary layer thickness in Shanghai is established, and a high-resolution sedimentary layer thickness model is constructed. The model shows a strong correlation with the regional geological structures of Shanghai and effectively characterizes the spatial variations of sedimentary layer thickness. Furthermore, the seismic vulnerability index of Shanghai is analyzed using the HVSR technique, and a seismic vulnerability distribution map is obtained. The results provide new constraints on the tectonic evolution and fault systems of Shanghai and offer scientific basis and technical support for seismic hazard mitigation, urban planning, and seismic design.

HVSR (horizontal to vertical spectral ratio), dense observation array, thickness of sedimentary layer; seismic vulnerability assesment

基于背景噪声HVSR技术和密集观测台阵, 结合地质钻孔资料, 建立适用于上海市的沉积层厚度估算公式, 并在此基础上建立高精度的上海市沉积层厚度模型。该模型与上海市的地质构造呈现高度相关性, 可精细地刻画沉积层厚度的空间变化特征。同时, 基于HVSR技术对上海市地震易损性指标进行分析, 获得上海市地震易损性分布图。研究成果可为上海市构造演化与断层系统提供新的约束, 为上海市的地震灾害预防、城市规划以及工程抗震设计提供科学依据和技术支持。