College of Geo??Exploration Science and Technology, Jilin University, Changchun 130026, China 

 Volcanic eruptions are often triggered by magmatic activities within the Earth＇s crust. Monitoring the surface deformation in volcanic regions can effectively infer the state of underlying magma. To monitor the sur? face deformation of the volcanic areas, Sakurajima Volcano in Japan was selected for a detailed study. We applied the SBAS ??InSAR technique to process 75 Sentinel ??1A images from 2019 to 2021. The results show that Sakuraji? ma Volcano is in a relatively active phase, predominantly characterized by subsidence during the monitoring period, with an average deformation rate of - 10. 05 mm / a. The most significant subsidence was observed at the central zone of the volcano, amounting to a cumulative deformation of - 62. 72 mm. This area also exhibited pronounced seasonal variations. The uplift occurred mainly in the peripheral area of the volcano, with the maximum uplift oc? curring on the southeast side of Sakurajima, with a cumulative uplift of 108. 71 mm during the monitoring period.