Abstract:We use the D-InSAR technique to process the 2-view descending track Sentinel-1A data covering the period before and after the eruption of 2020 Sakurajima volcano in Kagoshima city, Japan. We obtain the surface deformation field caused by the volcanic eruption event, and on this basis, we carry out the inversion analysis of the magma source during the eruption of Sakurajima volcano by combining the point source Mogi model. The results show that subsidence during 2020-07-28~08-09 is mainly concentrated in the central area of the volcano, and the maximum subsidence area is the central area of the volcano, with maximum and average subsidence amounts of 5.5 cm and 2.85 cm, respectively. The uplift mainly occurs in the rim area of the volcano, with maximum and average uplift amounts of 5 cm and 2.24 cm, respectively. The uplift may be related to the magmatic activity below the crater of Ayla. The inversion of the point-source Mogi model yields a magma source depth and volume change of 1.016 km and -0.139×106 m3, respectively, and the magma source is located below Minami-dake, which is related to the eruptive activity of Minami-dake.
LIU Yuanyuan,ZHAO Zhenyu,YAN Xia et al. Deformation Field Solution and Inversion Analysis of Sakurajima Volcanic Eruption Based on D-InSAR[J]. jgg, 2022, 42(8): 818-822.