Activity Analysis of the Fuyu North Fault, China: Evidence from the Time-Series InSAR, GNSS, Seismic Reflection Profile, and Plate Dynamics

Abstract Earthquake disasters are frequent, and the seismic intensity is large in Northeast China. activity research an important aspect of earthquake disaster management. We chose some unconventional means to study fault activity, find updated evidence. The Ms 5.3 occurred near Fuyu North Fault (FNF) China on May 27, 2018. Using Sentinel-1B descending orbit data from 2016 2019, line-of-sight (LOS) surface deformation area was calculated by using small baseline subset (SBAS) method. After transforming horizontal EW deformation, variance component estimation method used for fusion reconstruction with surrounding GNSS stations. polynomial least square fit slip rate three trace FNF. fitting results regions show that eastward distribution upper plate significantly greater than lower plate, which left-lateral clockwise torsion. vertical structural caused growth strata plates SYT2 profile FNF quantitatively calculated, thrust 0.2 mm/y relative plate. Based Li Siguang chessboard structure model, we found compression stress north-south direction gradually weakened, east-west enhanced. Through Coulomb analysis, events CMT only induced historical focal location part. 2017 did not induce 2018, but 2019 were related effects