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Slide 10 of 18


This figure shows the unfiltered residuals for the east-west component of all stations. These are the residuals of the timeseries relative to REYK.
The stations are moving periodically east-west with a period of approximately 1 year. The amplitude varies from 4 to 8 mm between stations. So now we wonder what can cause these variations in a network that is processed in a baselinewise fashion. Noting that all the stations are moving in phase, regardless of on which tectonic plate they are, we try changing the refernce station by simply subtracting the timeseries of our new reference station from the other timeseries.