Fig. 3From: GPS-derived geocenter motion from the IGS second reprocessing campaignStacked periodogram of the GPS-derived geocenter motion time series with truncated degree from 1 to 10. The blue, green and red lines represent the PSD results of X, Y and Z components, respectively. The black and green vertical dashed lines represent the 1.0 cpy and 1.04 cpy harmonicsBack to article page