Abstract：We reconstruct and extract the high-frequency stationary signals and low-frequency trend signals of Shanxi fault zone cross-fault deformation observation data using empirical mode decomposition(EMD). We analyze the earthquake precursory anomalies and their manifestations based on the high-frequency stationary signals reconstructed, and the results show that notable omen anomalies appear before the moderate-strong earthquakes occurred in Shanxi province and its adjacent areas. While there are a great number of abnormal sites before the strong earthquakes in the adjacent areas, which are widely spread and far from the epicenters, the abnormal sites before the moderate-strong earthquakes in Shanxi province concentrate close to the epicenters. We analyze the spatio-temporal evolution characteristics of fault deformation based on the low-frequency trend signal reconstructed, and the results show that the faults in Shanxi fault zone are dominated by inherited positive fault movement, but the fault movement characteristics vary by place and time.
ZHENG Hongyan,TIAN Xiao,LI Layue. Analysis of Shanxi Fault Zone Cross-Fault Deformation Observation Data Based on Empirical Mode Decomposition[J]. jgg, 2020, 40(10): 1068-1073.
