布格重力异常和地壳厚度之间存在着一种反相关系,即重力异常越低,反映的莫霍面就越深;重力异常越高,反映的莫霍面则越浅。这种关系在一般情况下是成立的。但是应当指出,有许多地方并不遵守上述相关关系,这主要是由于上地幔密度的非均匀性对区域重力异常的影响所致。一些反演地壳厚度的公式如sinx/x法、压缩质面法都要解决上地幔的密度这个问题。由于地球上各处上地幔的密度不尽相同,有的地方相差比较悬殊。所以想把各个地区每点的上地幔密度值了解清楚是困难的,特别是对广大的洋区,在地震资料比较少的情况下更是如此。但是,用测线上(或附 There is an inverse relationship between the Bouguer gravity anomaly and the crustal thickness. That is, the lower the gravity anomaly, the deeper the Moho will be reflected. The higher the gravity anomaly, the shallower the Moho will be. This relationship is generally established. However, it should be pointed out that there are many places that do not comply with the above correlations, mainly due to the impact of the heterogeneity of the upper mantle on the regional gravity anomalies. Some formulas that invert the thickness of the crust, such as the sinx / x method and the compression mass method, must solve the problem of the density of the upper mantle. Due to the different densities of the upper mantle on different parts of the earth, the difference in some places is quite different. Therefore, it is difficult to understand the density value of the upper mantle at each point in each area, especially for the vast oceanic area, especially when the seismic data are relatively small. However, with the line (or attached