基于碰撞海啸理论的多环盆地形成模型  

The Formation Model of Multi-ring Basins Based on the Theory of Impact Tsunami

作　　者：史建春[1,2] 马月华[1,3] 包纲[1,3] 

机构地区：[1]中国科学院紫金山天文台,南京210008 [2]中国科学院研究生院,北京100039 [3]中国科学院国家天文台,北京100012

出　　处：《天文学报》2009年第1期54-59,共6页Acta Astronomica Sinica

基　　金：国家自然科学基金(10573037);紫金山天文台小行星基金会资助项目

摘　　要：采用初始扰动为抛物面形弹坑情况下的浅水波理论,对多环盆地形成的海啸模型进行了讨论,得出了计算环位置的公式.通过计算月球上三个多环盆地(东海、莫斯科海和南澄海)的环位置并与观测数据进行比较可看出海啸模型仅适用于主环(第Ⅳ环)之内,该环也标志着挖掘盆地的边缘和液化区域的结束边界.此外,在假定液化深度相同的情况下,与初始扰动为冲击压情况下的浅水波理论得出的环位置公式进行比较,可以发现利用初始扰动为抛物面形弹坑计算出的盆地达到目前状态所需的时间小,这个时间差可解释为从撞击开始到形成抛物面形瞬时弹坑所需的时间.The tsunami model of the origin of multi-ring basins has been analysed with the theory of shallow water waves generated by an initial surface deformation, which is set as a parabolic crater. An approximate formula for calculating the ring radius has been de- rived. From the computed ring spacing of three multi-ring basins on the moon （Orientale, Moscoviense and Serenitatis South）, it is shown that the tsunami model can only be applied to the area within the main ring （the IV ring）, this agrees with the previous conclusion that the IV ring marks the end of fluidized region and the crater rim of the excavated basin. Besides this, by comparing the result of initial impulsive pressure disturbance with initial deformation disturbance under the condition of same fluidized depth, it seems that the time of multi-ring basins required to reach its present status in the case of initial deformation disturbance is shorter than the case of initial impulsive pressure disturbance, this time dif- ference can be explained as the time required from the start of impact to the formation of a parabolic crater.

关 键 词：月球 方法:解析 

分 类 号：P184[天文地球—天文学]