Ground Deformation Monitoring and Influencing Factors Analysis in Fuzhou City Based on PSI Technology

In this research, 66 Sentinel-1 images spanning from January 2018 to June 2023 were analyzed using Persistent Scatterer Interferometric (PSI) technology to map ground deformation in Fuzhou City. The accuracy of the results was demonstrated by cross-validation. The study reveals that the overall deformation rate in Fuzhou City ranges from −44~18 mm/a, with five distinct regions experiencing significant ground subsidence. Among these, four regions are located near subway lines, and the maximum subsidence occurs at the intersection of Xiazhang Road and Fubei Road in Changle District. The occurrence of subsidence in Fuzhou is the consequence of a complex interplay between natural and anthropogenic factors. In terms of natural factors, the subsidence is primarily distributed in areas with Quaternary sediments. The anthropogenic factors primarily include construction activities such as subway construction, building construction and demolition, as well as changes in ground loading due to warehouse operations such as cargo loading and unloading. The study results can provide a reference basis for urban construction and prevention management of subsidence disasters in Fuzhou.