月球正面撞击坑的空间分布特征分析

发布时间：2018-08-09 11:21

【摘要】：通过IAU最新公布的撞击坑名录、"嫦娥一号"影像与DEM数据,本文使用数理统计和空间分析的方法研究了月球正面撞击坑分布的空间不均衡性。主要体现在:(1)月球正面直径较大的撞击坑主要分布在月陆区域,且集中趋势明显,而月海区域直径较大的撞击坑分布较少,周围有大量直径较小的撞击坑;(2)直径较大的撞击坑在月表具有一定随机性,而直径较小的撞击坑在月表的集中性明显;(3)赤道区域的撞击坑密度小于两极区域,前导半球的撞击坑数量小于后随半球;月海区域的撞击坑密度小于月陆区域;密度最大的区域位于月球正面的中南部;(4)月球正面深度大于2.5km的撞击坑主要集中在月陆区域,且在南极的中央经线附近更为集中;在57°N至24°S之间,深径比处于较高水平,最大值出现在14°N附近,均值在0.14左右波动,自该区域至南北两极,深径比逐渐减小,并在南极附近出现最小值;(5)月陆区域撞击坑坡度最大值的均值大于月海区域;坡度最大值的均值规律性明显,即自赤道至两极,撞击坑坡度最大值的均值逐渐增大。月球撞击坑的空间分布具有一定空间集聚性、经向和纬向差异性,该特征与撞击坑形成理论间的耦合关系仍需深入研究。
[Abstract]:The spatial disequilibrium of the distribution of the frontal craters on the moon is studied by using the "Chang'e 1" image and DEM data. This paper uses mathematical statistics and spatial analysis to study the spatial disequilibrium of the distribution of the frontal craters on the moon. It is mainly reflected in the following: (1) the impact craters of the larger frontal diameter of the moon are mainly distributed in the lunar region, and the concentration trend is obvious, while the moon sea area is obvious. The larger diameter impact craters are less distributed, and there are a large number of smaller diameter craters; (2) the larger impact craters have a certain randomness on the monthly meter, while the smaller diameter craters are concentrated in the monthly meter; (3) the impact pit density of the equatorial region is less than the two polar region, and the number of the impingement pits in the leading hemisphere is less than the following hemisphere; the moon sea is less than the moon sea. The density of the impact pits in the region is less than the monthly land area; the area with the largest density is located in the middle and south of the lunar front; (4) the impact pit of the frontal depth of the moon is mainly concentrated in the lunar region, and is more concentrated near the central meridian of the Antarctic, and the depth ratio is at a higher level between 57 and 24 S, and the maximum value is near 14 N. The value of the value fluctuates around 0.14, from the region to the north and south poles, the depth ratio decreases gradually, and the minimum value is found near the Antarctic; (5) the mean value of the maximum value of the impact crater is greater than that of the sea area; the mean regularity of the maximum value of the slope is obvious, that is, the mean value of the maximum value of the impact crater is gradually increased from the equator to the two poles. The spatial distribution has certain spatial agglomeration and difference in longitude and latitude. The coupling relationship between the characteristics and the theory of crater formation needs further study.
【作者单位】：中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室;中国科学院大学;东北师范大学城市与环境科学学院;
【基金】：国家自然科学基金项目(41171332) 中国科学院地理科学与资源研究所知识创新项目(201001005)
【分类号】：P184

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