Abstract:An earthquake considerably threatens the safety of human life and obviously impacts the building structure. Studying the non-stationary characteristics of the earthquake wave intensity can provide a reference for earthquake prevention. Herein, the non-stationary feature extraction model of the seismic wave intensity is studied, and the deterministic and random parameters are set. Further, the non-stationary characteristics of the seismic wave intensity are analyzed based on the Fourier transform. Subsequently, a mathematical model is selected according to the analysis results, and the model parameters are set. The seismic amplitude spectra corresponding to the recorded seismic wave intensity are decomposed into a set of components on different scales, and continuous components can be obtained by reorganizing them; subsequently, the seismic wave amplitude spectrum is extracted. The relation between the amplitude and phase spectra of a seismic wave is used to extract the non-stationary characteristics of the seismic wave intensity. The simulation results denote that the proposed method is more accurate in extracting the non-stationary features of the seismic wave intensity when compared with the remaining methods; therefore, the proposed method is of considerable significance for analyzing high-resolution seismic data.