INVESTIGATION ON THE SPACE DISTRIBUTION CHARACTERISTIC OF TIDAL GRAVITY VECTOR IN CHINA

In this paper the authors analyse the earth tide observation data during 2890 days at 10 stations, using Cartwright's development and Venedikob's harmonic analysis method. Nakai's fitting system is also used here for increasing the signal to noise ratio of the results of analysis. At the same time, for comparison, linear interpolation method has been employed in treating the sensitivity data of the gravimeters. The study will be centered on the space distribution characteristics of tidal gravity vector in China, and its relationship to oceanic loading. Analysis indicates that the space distributions of tidal gravity vector are obviously controlled by oceanic loading especially by the wave O1.The rheological effect of the instruments and the results of analysis in considering these effect are discussed, the phase lags amount mostly to about -1, agreeing with theory. In addition, authors examine also the relations between the residual vector and the oceanic loading vector, their conformity indicates their mutual effect. By means of the method of error vector, the accuracy of the results of analysis was examined to be not enough. Finally, based on such studies, the observed waves M2, and 1 after correction have been obtained.