下地幔侧向不均匀及绝对板块运动对大地水准面的影响
The Effect of Lateral Heterogeneities of Lower Mantle and absolute Plate Motions on Geoid
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摘要: 本文提出并研究了板块上大地水准面受下地幔侧向不均匀性及板块绝对运动的影响而随时间变化的问题。利用已有的下地幔侧向不均匀性模型、板块绝对运动速度模型进行了计算,并分核幔边界不存在起伏和存在起伏两种情况进行了讨论。结果表明,在相当长时间内,其垂直变化绝对幅度可达200米。确定古大地水准面应考虑这一变化。Abstract: In this paper,we advanced and studied the time-dependent changes of the geoid caused by lateral heterogeneities of lower mantle and absolute plate motions.The principles were explained and some preliminary conclusions were given.
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