harmonic oscillations of time series

In order to study and determine the period of harmonic oscillations of time series of permanent stations, which are caused by various geophysical, the following factors in the investigation. A database of daily time series of 111 permanent stations, the observations that are running for at least 3 years. Permanent stations located around the world on different tectonic plates. Developed an algorithm and application packet processing time series and determine the optimal curves, describing them as reliable. For each station, write an equation to determine the optimal period of oscillation.

It is proved that the geophysical factors significantly effect on the altitude position of permanent stations, which finds its reflection in the results of their time series. Therefore, investigation of time series of permanent stations is important for study of the Earth geodynamics.
The work is devoted to the study of time series of permanent stations in Europe in order to allocate the geophysical impact on their results.