不同重力场模型对青藏高原莫霍面反演的影响

Effect of various gravity field models on the Moho topography inversion in the Tibet

针对当前少有学者研究不同重力场模型对莫霍面地形反演的影响,该文利用Parker-Olderburg方法深入讨论纯GRACE重力场模型、纯GOCE重力场模型以及GRACE和GOCE混合重力场模型对青藏高原地区莫霍面反演的影响。实验结果表明,不同重力场模型所反演的莫霍面地形整体空间分布上比较一致,但也存在10 m量级的细微差异;该地区莫霍面地形分布呈顺时针旋转模式,可以较好反映主要构造结构的特点;最深的莫霍面约为70 km,远超过了其他地区正常地壳的厚度。

Aiming at present situation that the effect of different gravity field models on Moho terrain inversion is reported by few publications. According to the Parker-Olderburg method,the effect of pure GRACE gravity field model,pure GOCE gravity field model and their mixed gravity field model on the Moho relief inversion in the Tibet was discussed deeply in the present study. The results showed that the spatial distribution of inverted Moho topography using varying gravity field models was similar and the difference was on the order of 10 m. The Moho terrain in the study area presented clock-wise pattern,which is consistent with the character of primary tectonic structure. The deepest Moho topography was approximately 70 km,far deeper than the crustal thickness in other normal areas.