The Variation Of The Earth's Oblateness In Geological Epoch And Analysis On The Earth Expansion

The shape of the Earth and the Earth's evolution is the study of the Earth's two front-end problems.This paper is combined with those two studies.First,establish the evolution of the Earth system.That is expansion theory.Based on the data obtained on the basis of the global expansion study the flat rate of the Earth.Quite few valuable material on the Earth's expansion,because the doctrine of evolution of the Earth,based on plate tectonic theory-driven.But this does not hinder the scholars study the expansion of the doctrine of the Earth in-depth.Many scholars of the global expansion give good ideas.The author collected of the previous literature on the basis of the expansion of the Earth doctrine,and established a global expansion evolution model.This model of the Earth's radius and angular velocity of the basic research in the geological history of changes,these calculated data was to provide the Earth oblateness a reference.The Earth oblateness has been quite accurate values today.But the Earth oblateness in the geological history is still a very new field.There are little references in this regard.In recent years,my mentor,Professor Wang Junheng does some research and has published some papers.Generally speaking,it is difficult for us to establish an accurate physical model of the Earth.Because it is too complex.It involves the hard physical and mathematical problems.The specific hierarchical structure of the Earth's interior is just about understands and the details of the internal physical parameters are unknown.So,in order to facilitate the calculation,we simplified Earth model.We establish two extreme models.One assumes that the Earth is in hydrostatic equilibrium flat rate formula based on export-game function theory the Earth,to study the flat rate and the radius of the Earth the relationship between the quality and the angular velocity.The other assumes that the Earth is homogeneous perfectly elastic,flat rate of Earth's lower limit formula derived according to the kinetic theory of elasticity,flat rate with the Earth's average density p,gravitational acceleration g,rotation velocity ?,an average radius R,the Young's modulus E,the Poisson's ratio v.Understanding of the two extreme models,you can get to the earth oblateness in the range of geological history.From the study of the two respects,I hope to establish a reasonable evolution of the earth and the earth flat rate model to fill the vacancy of the research in this area.