Research on monitoring fault activity using spaceborne synthetic aperture differential interferometry radar, taking Handan area as an example

Abstract

The comprehensive positioning and seismic hazard assessment of fault zones are significant challenges faced by many countries worldwide. The author employs SBAS-InSAR technology to conduct spaceborne interferometry radar timeseries dynamic monitoring of the Handan area, with a focus on the Handong fault as the main subject of investigation. The monitoring period spans from the beginning of 2017 to 2021, comprising a total of 48 monitoring phases. The comprehensive deformation velocity fields and monthly cumulative deformation data were obtained and primarily used to analyze the Handong fault in conjunction with multiple data sources. The results indicate that the Handong fault is the primary structural feature in this area, acting as the demarcation line between regional uplift and subsidence deformations. On the western side of the Handong fault, there is evidence of uplift, while the eastern side experiences subsidence. The average uplift rate on the western side is approximately 0.51 mm/a, which is generally consistent with the overall uplift rate of the Taihang Mountain. On the eastern side, the average subsidence rate is -29.8 mm/a, which is mainly attributed to the over-extraction of groundwater, with a relatively lower likelihood of being influenced by tectonic activity.