【摘要】 针对表面载荷模型较难反演撞击坑物理参数,以往重力地形数据因分辨率低不适合大多数小尺度撞击坑物理特征分析,提出构建新的撞击坑载荷模型.结合内部载荷和最新高分辨率卫星重力地形数据,对Apollo撞击坑平均月壳厚度、平均月壳密度、载荷比、填充物比率和岩石圈弹性厚度等物理参数进行反演.结果表明模型导纳谱很好地拟合了观测导纳谱.本文求解的平均月壳厚度比较支持最新研究结果 34 km,平均月壳密度2480 kg/m3与最新给出的平均月壳密度2550 kg/m3相接近.研究区域的弹性厚度偏小,约为7 km.较小的弹性厚度可能与撞击坑地理位置及早期撞击事件有关,也可能与月球岩石圈的力学性质有关.更多还原

【Abstract】 The previous surface loading model generally fails in parameters inversion for crater areas. The resolution of previous lunar gravity field models and topography data is too low to be suitable for small-scale craters geophysical research. As to such problem, this paper developed a new surface loading model to perform well in parameters inversion for craters. Combined with a subsurface loading model and recent high-resolution gravity and topography data, the geophysical parameters such as mean crustal thickness, mean crustal density, load ratio, fillings ratio and lithospheric elastic thickness are well inversed for Apollo crater. And the gravity/topography admittance modeled is best fitting those observed. The mean crustal thickness 34 km agrees with recent studies, and the mean crustal density 2480 kg/m3 is close to the recent result 2550 kg/m3. A lower elastic thickness 7 km is ultimately found, which may be ascribe to the geography of the crater, heating at the time of impact, and lithospheric mechanical property of the Moon.更多还原