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潮汐观测记录比滨海沉积物的放射性碳测年有更精确的指示海平面或地平面相对变化的能力,但此法只能对过去一个世纪以来的一段时间内的变化作出指示。海平面的相对变化是由于大陆的区域性和局部的大地构造运动、地壳的均衡作用、诸如水的密度和岸外海海
Tidal observations have a more accurate indication of the relative change in sea level or ground level than the radiocarbon dating of coastal sediments, but this approach can only indicate changes over time that have been over the past century. The relative change in sea level is due to the regional and local tectonic movement of the continent, the balanced crustal action such as the density of water and the offshore sea