Analysis of Vertical Deformation with InSAR in Shaanxi Province

  Objectives  To prove the effectiveness of interferometric synthetic aperture radar (InSAR) data in describing the deformation in the local area, the vertical deformation surface information of Shaanxi Province is obtained with Sentinel-1 free data of European Space Agency from 2018 to 2019.

  Methods  The information is compared with the point and line vertical deformation information from the global navigation satellite system (GNSS) and the level.

  Results  The results of vertical deformation monitoring show that the uneven subsidence with the maximum velocity of 60 mm/a occurred in the local mining areas of Yulin and Shenmu where the subsidence of surface widely distributed and have obvious characteristics. There are also subsidence with the velocity of 30 mm/a in Changwu and Binxian where the coal has been roughly mined for long time. Uneven subsidence occurs in Xi'an, Weinan of Guanzhong Plain due to excessive groundwater exploitation. The subsidence of local area in Xi'an is the most serious, with the maximum velocity of 60 mm/a.

  Conclusions  The vertical movement trends of InSAR are consistent with the results of GNSS and level in Shaanxi Province on the whole, however the GNSS monitoring points and the level monitoring points are generally deployed in the stable areas, the subsidence range and subsidence velocity obtained by them are somewhat different from the subsidence results obtained by InSAR.