Ancient subsurface structure beneath crater Clavius:constraint by recent high-precision gravity and topography data

作     者：Zhen Zhong Jian-Guo Yan J.Alexis P.Rodriguez 

作者机构：School of Physics and Electronic ScienceGuizhou Normal University State Key Laboratory of Information Engineering in SurveyingMapping and Remote SensingWuhan University Guizhou Provincial Key Laboratory of Radio Astronomy and Data ProcessingGuizhou Normal University Planetary Science Institute 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2019年第19卷第1期

页      面：95-102页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by a grants from the National Natural Science Foundation of China (Grant Nos. 41864001 and U1831132) Open Fund of State Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University (Grant No. 17P03) Guizhou Normal University Doctoral Research Fund supported by grants from the Hubei Province Foundation innovation group project (2015CFA011, 2018CFA087) Open Project of Lunar and Planetary Science Laboratory, Macao University of Science and Technology (FDCT 119/2017/A3) Open Fund of Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing (KF201813) 

主　　题：Moon planetary systems:planets and satellites:fundamental parameters planetary systems methods:data analysis 

摘      要：With the increasing precision of the GRAIL gravity field models and topography from LOLA, it is possible to investigate the substructure beneath crater Clavius. An admittance between gravity and topography data is commonly used to estimate selenophysical parameters, including load ratio, crustal thickness and density, and elastic thickness. Not only a surface load, but also a subsurface load is considered in estimation. The algorithm of particle swarm optimization(PSO) with a swarm size of 400 is employed as *** indicate that the observed admittance is best-fitted by the modeled admittance based on a spherical shell model, which was proved to be unsatisfactory in the previous study. The best-fitted load ratio f is around-0.194. Such a small load ratio conforms to the direct proportion between the nearly uncompensated topography and its corresponding negative gravity anomaly. It also indicates that a surface load dominates all the loads. Constrained within 2σSTD, a small crustal thickness(～30 km) and a crustal density of ～2587 kg m-3are found, quite close to the results from previous GRAIL research. Considering the well constrained crustal thickness and density, the best-fitted elastic thickness(～7 km) is rational. This result is slightly smaller than the previous study(～12 km). Such difference can be attributed to the difference in crustal density used and the precision of gravity and topography data. Considering that the small difference between the modeled gravity anomaly and observations is quite small, a parameter inversed here could be an indicator of the subsurface structure beneath Clavius.