【摘要】 本文基于ＰＲＥＭ模型，通过解Ｃｌａｉｒａｕｔ微分方程求出地球的椭率及其一、二阶导数沿径向的分布，作为比较，计算分别采用自然边界和用大地测量给出的地表椭率两种边界条件，结果表明二者的椭率分布相对误差为３．９‰，最大不超过４‰。更多还原

【Abstract】 In this work we figure out the interior distribution of the Earth’s ellipticity and its first and second derivatives based on PREM Earth model by solving Clalraut’s differential equation.As comparison we apply forced and natural boundary conditions to the differential equation respective ly.The resuslts indicate that the relative difference between the two distribution of the ellipticity is no larger than 0.4%,and always varies around 0.39%.更多还原