Some Issues About The Inner Structure Of The Moon

The lunar gravitational field can reflect the mass distribution interiors of the moon. The evolution information are recorded in the lunar terrain since it formed billion years ago. In this paper, the author make use of the latest gravity field and topographic data which can be accessible for normal user, and explore the internal structure of the moon by means of the research guideline, which is that first the overall then the local and that from deep to shallow.1.On the basis of understanding the predecessors work about the internal structure of the moon, a common problem is found when researchers using of the same data by different processing methods or using the same approach but adopting different data, The inner structure would be inconsistencies with each other. In order to resolve this question, the author used parts of latest physical parameters of the Moon, based on the Lane-Emden equation, given the radius of the core and the thickness of lower mantle for the moon when the material density equated with the extreme values. These results can be useful and provide a reference for future research work when much more constraints appeared in studying overall hierarchical structure of the moon2.Taking use of the latest gravity field and topographic data of the moon, then giving a discussion of how to reduce the free air gravity anomaly to the mean surface of lunar radiu, which can be used as a terrain correction when the bouguer anomaly need to be calculated on the mean surface of the moon. Finally, the author inverse the lunar crust thickness by the bouguer data for some nearside region of the moon and discussed the equilibrium state for the lunar crust.3.The compensation state (Airy or Pratt)in the moon is not as simple and direct as it on earth. In order to studying the compensation state on the moon, the author based on the elastic flexure theory, regard the gravity as a response to the load induced by the terrain and estimate the crust thickness and elastic lithospheric thickness in the nearside of the moon for some typical regions in the frequency domain. These results can be used as new constraints for study the lunar thermal history.4.The thermal state of the moon have dominated influence on the elastic thickness. In the purpose of understanding the equilibrium state and the mechanism of terrain formation, the author discuss the temporal and spatial distribution of the thermal state in the moon after choosing a theory about the origin of the moon, and show the law of the temperature distribution, then give the variation range for the lunar radius in different thermal state.5.A physical mechanism was supplied by the author to explain why the terrain formed since the moon formed, which based on the flexure of the elastic lithosphere and elastic stress in the plate and the thermal state in the moon.