“On May 31, 2023, a sudden subsidence occurred in Balitai, Tianjin, causing severe damage to surrounding buildings and infrastructure. Experts combine the advantages of multi band SAR data to propose complex deformation extraction techniques. By utilizing C-band Sentinel-1 and L-band Land Penetrating 1 SAR data, deformation information in the area of sudden subsidence is obtained and analyzed, laying a technical and data foundation for the analysis of the dynamic mechanism of sudden subsidence in Bali Station. This is conducive to optimizing geothermal resource development technology, promoting urban safety and sustainable development.”