最近十五年来,对大陆裂谷的研究活动日益增多,新的资料大量涌现,然而,关于裂谷作用的基本机理和成因很少有一致的意见。熟知的地壳断裂运动的特征组合——隆起、断层和火山活动,被广泛认为是软流圈对流和岩石圈变薄引起的。这一概念得到长波长的负布格异常和上地幔的近正常Pn波速度的观侧结果 In the recent fifteen years, there has been more and more research activities on the rift in the mainland and a great deal of new information has emerged. However, there are few common opinions on the basic mechanism and cause of rifting. The well-known combination of crustal crustal movements - uplifts, faults and volcanic activity - is widely thought to be caused by asthenospheric convection and lithospheric thinning. This concept leads to the side-by-side results of long-wavelength negative Bouguer anomalies and near-normal Pn wave velocities of the upper mantle