RESULTS OF TIDAL GRAVITY OBSERVATIONS WITH A SUPERCONDUCTING GRAVIMETER AT WUHAN FUNDMENTAL STATION
Xu Jianqiao, Xu Houze, Sun Heping, Luo Shaocong (Institute of Geodesy and Geophsics, Chinese Academy of Sciences, Wuhan, 430077)
In this paper, data pre processing to the original digital recordings(a sample per 20 seconds) observed with a superconducting gravimeter at Wuhan fundamental station with the gravity residuals has been done, in which the original observations are separated into the theoretical gravity tides and the residuals, and then some known disturbances are removed from the residuals. Using ETERNA harmonic analysis programs, we obtain the gravimetric parameters(amplitude factors and phase lags) of two main tidal waves: O 1 :1.1788±0.0006, -0.5975°±0.028°;\ M 2 :1.1713±0.0002, -0.5873°±0.008° After oceanic loading correction, the observed gravimetric parameters of O 1 and M 2 waves accord very well with those of Wahr Dehant's earth tidal model. The discrepancy is better than 0.1% in amplitude.