Land Subsidence Monitoring of PSInSAR Analysis Using Sentinel-1 SAR Data from 2017 to 2022 in Chiba Prefecture, Japan

The Kujukuri Plain in Chiba Prefecture, Japan, is an area where water-soluble natural gas dissolved in groundwater is frequently pumped, and even in recent years, land subsidence of up to 2 cm/year has still occurred in some areas of Chiba Prefecture. In this paper, PSInSAR analysis is applied using Sentine1SAR data of descending and ascending orbits for five years from 2017 to 2022 to measure land subsidence in Chiba Prefecture, Japan. The results show that the locations where land subsidence occurs at more than 0.4 cm/year can be monitored with sufficient accuracy. The measurement accuracy of PSInSAR analysis is evaluated by comparing land subsidence based on PSInSAR analysis with leveling survey results in areas where land subsidence of up to 2 cm/year has occurred.