Land Deformation at Longyao Ground Fissure and Its Surroundings Revealed by Time Series Insar

The Longyao ground fissure, located in Hebei province, China, undergoes active changes in recent years. The caused deformation has resulted in severe damages to the public property. In order to mitigate these impacts, it is necessary to monitor the deformation of the ground fissure and its surroundings. In this paper, time series InSAR technique is applied to detect the ground movement by using C-band Sentinel-1A images from Oct, 2018 to Dec, 2019. Based on multiple interferograms, we derive deformation characteristics of the interesting area and find discontinuous deformation feature across the Longyao ground fissure, i.e., the northern side is uplifting while the southern side is subsiding. The mean deformation velocity ranges from - 65mm/yr to 60mm/yr. These results will assist in reducing the potential threaten to the human settlement of the studying region.