月球危海盆地重力异常多尺度分析

Multi-scale analysis of gravity anomalies for Mare Crisium Basin in Lunar

针对目前鲜有学者采用重力多尺度分析方法来研究月球危海盆地内部结构的问题,该文采用小波多尺度分析技术对月球危海地区重力异常数据进行分解得到不同尺度下的小波逼近和小波细节,进一步利用功率谱估计方法确定了不同尺度小波细节的场源埋深,反演了不同深度处密度分布。计算结果表明,危海盆地是一个典型的"质量瘤"地区,其中心位置大概是58.7°E,16.7°N,深度范围为32.7~64 km,呈现出上面小、下面大的特征,其底部直径近660 km。

Aiming at present situation that few scholars had studied structure of Mare Crisium Basin’s interior in Lunar using gravity multi-scale analysis method,wavelet multi-scale analysis technique was employed to decompose the gravity anomaly data in Mare Crisium to get wavelet approximation and wavelet details at different scales.Furthermore,the source depth of wavelet details at different scales was determined by using the power spectrum estimation method,and the density distribution at different depths was inverted.The results showed that the Mare Crisium basin was a typical“Mascon”area,its center position was about 58.7°longitude and 16.7°latitude,and its depth range was approximately from 32.7 km to 64 km,presenting the feature of the upper part smaller than the lower part.The diameter of the bottom for“Mascon”was close to 660 km.