论文部分内容阅读
地幔最底层（深２６００～２８８９ｋｍ处）的Ｄ″区是一个热学和化学边界层，在地球动力学中有重要作用。地震体波研究揭示了其复杂的速度结构。为了解释ＳｃＳ相位前驱波的观测结果，提出了Ｄ″顶部有一间断面的一维模型，均与可变化的垂直速度梯度有关；另一方面，最近...
The D “zone at the bottom of the mantle (2600-2889 km deep) is a thermal and chemical boundary layer that plays an important role in geodynamics. The study of seismic body waves reveals its complex velocity structure. Observations, the proposed D ”at the top of a section of the one-dimensional model, both with the variable vertical velocity gradient; the other hand, the recent ...