Figure 3
From: Parameters of the Earth’s Free Core Nutation from Diurnal Strain Tides
Strain amplitude spectrum42 inside the diurnal tidal band for each interferometer. Insets show the analysed time intervals. As for LAB780 and GAL16, red lines give spectra after removing time periods when the deformation signal is affected by snow melting and heavy rain episodes (“cleaned” data). Frequencies are expressed in cycles per sidereal day. Main diurnal tidal constituents are labelled.
