Abstract
Since the last U.S. national report on earth tides to the Fifteenth General Assembly, International Union of Geodesy and Geophysics [Kuo, 1971], research activities in tidal gravity have been moving rapidly from the search for a basic understanding of the predominant influence of ocean tides on tidal gravity toward studies of interaction of the earth and ocean tides. These activities in tidal tilt and tidal strain are as yet centered around the problem of evaluation of ocean tidal and local influences.However, all accumulated knowledge of spatial variations of earth tides points the direction of earth tidal research toward attacking the inverse problem for ocean tides by means of earth tidal measurements on the lands and islands, supplemented by ocean bottom measurements. Attempts at solving the inverse problem by means of tidal gravity measurements have already begun. Once the local influences on tidal tilt and tidal strain are understood and can be corrected, the precise tidal tilt and tidal strain measurements can also be of great value in solving the inverse problem. The prospects for satellite mapping of both earth and ocean tides are very hopeful.
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