Hafelekar GPS permanent station seasonal monitoring

Hafelekar (HFLK) is a GPS permanent station situated in Austria, at an approximate height of 2300 m. It began its activity in 1996 as an IGS and EPN station. A strong seasonal variation was observed in its time series of coordinates, especially in the North and Up components. Starting with 2001 some local GPS campaigns were performed at different seasons at three auxiliary GPS sites in order to monitor this behavior. It should be determined whether this is a local phenomenon.