Crust and mantle in these two areas are coupled as complicated crust mantle transitional zone consisting of multiple laminae with alternate high and low velocities, totaling 20 km in thickness.

• 海原地震区和巴颜喀拉地块与柴达木地块结合带莫霍面具有明显的活动迹象；壳幔耦合为复杂的高、低速相间的多层壳幔过渡带；总厚度达到20多千米.