Short-period fluctuation analysis of the new BIH LOD series

In this paper, we analyse the short-period tidal fluctuations in the new LOD series of ERP (1962.0 – 1982.0) reduced by Li Zhengxin, using the Marple algorithm. The Marple spectral analysis reveals sharp peaks at 13.652, 27.586 and 31.746 days. They are consistent with the tidal terms M_f, M_m and MS_m. Their amplitudes are estimated.

The elastic deformation parameter K/C is calculated at the fortnightly and monthly frequencies. A least squares solution gives 0.56 ± 0.21 and 0.89 ± 0.21 at these two frequencies. The difference between these two values is not significant.