THE ISOSTATIC DATUM FOR STUDYING OF THE SEA LEVEL CHANGES ALONG THE COAST OF CHINA

Relative sea level change can be derived from tide records. In order to study the general sea level change along the coast of China, it is necessary to make a unified reduction for all the results obtained from various tide stations. A so-called isostatic datum of vertical movement of thecoastal land hasbeen suggested as a basis of the unified reduction in this paper, established by useof precise releveling data completed between 50’s and 80’s.The vertical movement velocities relative to the datum at the bench marks of 15 tide stations have been calculated. These velocities provide a base for the reduction.