Abstract：Yinchuan basin is located in the north part of the North-South seismic belt, with strong historical earthquakes and active small earthquakes. Based on InSAR technology, we use Sentinel-1 data to obtain the high spatial resolution crustal deformation rate field of Yinchuan basin and its surrounding areas between 2015 to 2019. The result shows that the whole Yinchuan basin is in a sinking trend, and there are obvious differential movements on both sides of the Helanshan eastern piedmont fault and the Yellow river fault, while the activities of Luhuatai buried fault and Yinchuan buried fault are not obvious. In this paper, the fitting formula of the surface deformation curve between earthquakes is improved, so that the inversion of fault dip, strike slip rate, dip slip rate and locking depth can be realized based on the observation value of single orbit InSAR. The algorithm is applied to the inversion of Lingwu fault activity state and locked depth, and the result shows that the strike slip rate is about 3.03 mm/a, the positive dip slip rate is about 0.27 mm/a, the locked depth is about 6.8 km, and the dip angle is about 54.7°. In addition, InSAR monitoring found large local deformation in Shizuishan and Yinchuan. After InSAR time series analysis and field investigation, we infer the deformation may be caused by human activities.
