Analysis of coordinate time series of DORIS stations on Eurasian plate and the plate motion based on SSA and FFT

This study focuses on analyzing the time series of DORIS beacon stations and plate motion of the Eurasian plate by applying Singular Spectrum Analysis (SSA) and Fast Fourier Transform (FFT). First, the rend terms and periodic signals are accurately separated by SSA, then, the periodic seasonal signals are detected using SSA, and finally, the main components of the time series are reconstructed successfully. The test results show that the nonlinear trends and seasonal signals of DORIS stations are detected successfully. The periods of the seasonal signals detected are year, half-year, and 59 days, etc. The contribution rates and slopes in E, N, and U directions of the trend items of each beacon station after reconstruction are obtained by least-square fitting. The velocities of these stations are compared with those provided by the GEODVEL2010 model, and it is found that they are in good agreement except the DIOB, MANB, and PDMB stations. Based on the DORIS coordinate time series, the velocity field on the Eurasian plate is constructed, and the test shows that the Eurasian plate moves eastward as a whole with an average velocity of 24.19 ± 0.11 mm/y in the horizontal direction, and the average velocity of it is 1.74 ± 0.07 mm/y in the vertical direction.