Abstract:The continuous GPS reference station data of the Chinese Continental Tectonic Environment Monitoring Network are used to reveal the spatial distribution characteristics of the amplitude and phase of the vertical period. The results show that the vertical period signal of each station exhibits obvious seasonal variations, the average amplitude of the semi-annual period signal is only 1/4 of that of the annual period signal, and shows different spatial distributions. The amplitude of the annual cycle signal gradually decreases from west to east in space, with smaller amplitude in southeast coastal areas and larger amplitude in Sichuan and Yunnan; the amplitude of the semiannual cycle gradually decreases from southwest to northeast, and the semiannual cycle phenomenon is more obvious in north China and Sichuan and Yunnan. There is a big difference between phases of annual cycle and semi-annual cycle signals; the peak of annual cycle signal appears between February and August, and the peak of semi-annual cycle signal mostly appears in January and May, and there are obvious zoning characteristics. The peak of the annual cycle signal gradually appears later with increasing latitude, and the peak of the annual cycle signal appears later in coastal areas than inland at the same latitude; the peak of the semi-annual cycle signal appears mostly in May in southwest, northeast, and north China, and in January in south, central and northwest China.
MIAO Peiyu,XIAO Genru,GUO Zeng et al. Spatial Distribution of Vertical Periodic Signals in Continents GPS Time Series in Chinese Mainland[J]. jgg, 2023, 43(4): 356-363.