莫霍界面的重力补偿和地壳结构的基本模式

重力均衡的现象证明,地壳或上地幔内部必有水平方向的物质流动,它产生重力补偿作用,并且最终达到平衡状态。上地幔的低速层（其顶面在大陆地区约为120公里,在海洋地区约为60公里）可能是产生全球范围内重力补偿作用的一个重要层。地壳内部如有重要的补偿层,莫霍界面的深度将趋一致。莫霍界面深度的变化,说明地壳内部必无较大范围的补偿层。以莫霍界面为顶面的上地幔部分,对于重力补偿是否起作用呢?这个问

GRAVITY COMPENSATION OF THE MOHOROVICIC DISCONTINUITY AND THE BASIC MODEL OF CRUSTAL STRUCTURE

In this paper,the relationship between the average thickness of the earth crust obtained from Rayleigh-wave dispersion and the surface topography is discussed.In East China,this relationship can be expressed by two different straight lines.It is concluded that the crust in this area may be divided into two separate regions,the North and the South,each of which is an indepedent isostatic system at the depth of Mohorovicic discontinuity.The earth crust in western China belongs to other different isostatie systems.There is evident correlation between this crustal regionalization and geological phenomena.