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。
In this paper, we advanced and studied the time-dependent changes of the geoidcaused by lateral heterogeneities of lower mantle and absolute plate motions. The pri-nciples were explained and some preliminary conclusions were given.
出处
《武汉测绘科技大学学报》
CSCD
1991年第2期28-36,共9页
Geomatics and Information Science of Wuhan University
关键词
地幔
不均匀
板块
运动
大地水准面
lateral heterogeneity
anomaly of equivalent geiod
undulation of the core-mantle boundary
