利用重力多尺度分析方法反演月球雨海地区三维月壳与上月幔结构  

Inversion of three-dimensional lunar crustal and upper-mantle structure in the Mare Imbrium using gravity multi-scale analysis method

作　　者：余杭涛 许闯 黎晋博 简光煜 YU HangTao;XU Chuang;LI JinBo;JIAN GuangYu(Department of Surveying Engineering,Guangdong University of Technology,Guangzhou 510006,China;Guangzhou Marine Geological Survey,Guangzhou 511458,China;State Key Laboratory of Geodesy and Earth's Dynamics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430077,China)

机构地区：[1]广东工业大学测绘工程系,广州510006 [2]广州海洋地质调查局,广州511458 [3]中国科学院精密测量科学与技术创新研究院大地测量与地球动力学国家重点实验室,武汉430077

出　　处：《地球物理学报》2023年第5期1931-1944,共14页Chinese Journal of Geophysics

基　　金：国家自然科学基金(41974014,42274004);广东省自然科学基金(2022A1515010396);中国科学院精密测量科学与技术创新研究院大地测量与地球动力学国家重点实验室开放基金项目(SKLGED2021-1-2)资助。

摘　　要：雨海盆地是月球正面最大的撞击盆地之一,确定其月壳与上月幔精细三维结构,对研究月球"质量瘤"形成机制等科学问题具有重要意义.常用于反演月壳与上月幔结构的月震波方法受限于月震台站稀少,给出三维结果的空间分辨率不足.随着重力测量技术的发展,月球重力数据横向分辨率逐步提高,但存在垂向分辨率不足问题.鉴于此,本文采用重力多尺度分析方法来进行改善,以获取研究区域月壳与上月幔精细三维密度结构与壳幔界面深度.研究结果表明:雨海盆地内部存在一个顶部小、底部大的高密度物质体,其底部中心位置约为经度16°W,纬度42°N;雨海盆地壳幔界面存在明显上隆,且盆地内部上隆趋势不平滑,发现有类环状异变现象;雨海"质量瘤"可能是由内部高密度物质和壳幔上隆共同推动形成的;重力多尺度分析方法可以有效提升重力数据的垂向识别能力,获取更为精细的三维月壳与上月幔结构.The Mare Imbrium is one of the largest impact basins on the visible near side of the Moon.It is significant to determine refined three-dimensional lunar crustal and upper-mantle structure of the Mare Imbrium for studying the formation mechanism of the lunar"Mascon".The spatial resolution of three-dimensional lunar crustal and upper-mantle structure inverted from common moonquake wave method is poor due to sparse moonquake stations.As the development of lunar gravimetry technology,the lateral resolution of gravity data is improved gradually.However,its vertical recognition capability is still poor.Therefore,for improving this problem,the gravity multi-scale analysis method is applied to determine refined three-dimensional density structure of lunar crust and upper mantle,and crust-mantle interface.Research results show that:There is a high density material with small top and large bottom beneath the Mare Imbrium,and the center of the bottom is at approximately 16°W and 42°N;The crust-mantle interface of the Mare Imbrium is obviously uplifting,and the uplift trend is not smooth,existing cricoid mutation phenomenon;The internal high-density material and crust-mantle interface uplift possibly jointly promote the formation of"Mascon"in the Mare Imbrium;Gravity multi-scale analysis method can effectively improve the vertical recognition capability of gravity data,and obtain more refined three-dimensional lunar crustal and upper-mantle structure.

关 键 词：重力多尺度分析 月球 密度 壳幔界面 雨海 

分 类 号：P223[天文地球—大地测量学与测量工程] P312[天文地球—测绘科学与技术]