Advances in Earth Science
• Articles •
SUN Heping, ZHOU Jiangcun
SUN Heping, ZHOU Jiangcun. CORRECTION PROBLEM OF THE OCEAN LOADING SIGNALS ON GRAVITY MEASUREMENTS AT FUNDAMENTAL STATIONS IN CRUST MOVEMENT OBSERVATION NETWORK IN CHINA[J]. Advances in Earth Science, 2002, 17(1): 39-43.
The main purposes for the observation network of the crust movement in China are to detect and to study the variation laws of the various geophysical fields induced by crust movement, to serve further disaster reduction and environmental protect, to provide important basic observations and background information, therefore the realization of this research project processes very important application prospects. Now it is possible to study the detail structure of the gravity filed due to the improvement of theoretical models and the wide use of the GWR superconducting and of the FG-5 absolute gravimeters with high precision. Researches show that it is obviously important to study the oceanic influence when to determine the Earth's tidal parameters, to study inversely the structure of the crust and upper mantle, to check the movement of the Earth's core, to estimate the resonance parameters of the nearly diurnal free wobble (NDFW) and to study the gravity change due to the Earth's rotation and polar motion. Based on the most recent global ocean tidal maps (Csr 3.0，Fes 95.2，Tpxo 2 and Csr 4.0) and the old Schwiderski (Scw 80) ones, ocean tidal data along the coast of China and the standard Earth model loading Green functions, the influence of the oceanic loading on the tidal gravity measurement at 25 fundamental stations are studied by using a direct convolution technique. The loading amplitudes and phases for 8 main waves are calculated, the temporal variation of the tidal loading at 10 main stations as of Beijing and Shanghai, is constructed in the present study.