Monitoring and Analysis of Surface Deformation in Songyuan City, Jilin Province Based on Time Series InSAR

Frequent occurrence of earthquakes and the massive exploitation of underground resources make Songyuan City an area prone to surface deformation. Surface deformation causes damage to roads, pipelines and other public facilities, and have a negative impact on the ecological protection and economic construction. Based on the SBAS-InSAR and using Sentinel-1 images as the data source, this study obtained the time series surface deformation results of Songyuan City from August 2015 to August 2019. Furthermore, through the consistency check of deformation results obtained by different methods or data, and the cross-validation between InSAR and leveling results, the reliability of time series InSAR applied to surface deformation monitoring in Songyuan City was proved. The results showed that the surface deformation of Songyuan City was dominated by slow subsidence, the average deformation rate was - 0.6 mm/year, and the deformation showed an annual cyclical "subsidence-uplift" change. The maximum cumulative subsidence reached - 100.6 mm, occurred in the oil production area in the east of Qian'an County. Finally, starting from natural influencing factors, this study analyzed the differences in deformation results of different land cover areas, studied the correlation between time series deformation and meteorological data, and discussed the relationship between deformation and earthquake distribution. By monitoring and analyzing the surface deformation results based on time series InSAR, it can provide data reference for urban planning and ecological environment improvement of Songyuan City, improve the scientific level of surface deformation disasters monitoring and prevention, and lay a good foundation for sustainable development.