Abstract—Based on the common-mid-point (CMP) seismic data on the 3-DV reference profile, using dynamic conversion of refracted waves into time sections, we constructed velocity sections across four crustal blocks in the boundary region of ​​the Siberian platform and the folded region: the Nizhnealdansakaya (Lower Aldan) depression, Pre-Verkhoyansk foredeep, Sette-Daban block, and West-Verkhoyansk folded area. The four structures contact each other along the fault zones with the velocity model abruptly changing at these boundaries. Within the Lower Aldan depression, the topography of two refractive discontinuities is constructed: the basement boundary and intermediate boundary in the sedimentary cover. In the Pre-Verkhoyansk foredeep, one refractive discontinuity is revealed in the sedimentary cover, whereas the basement boundary in this region is located at greater depths than covered by the observation system. All the discontinuities established in these blocks are lithological. In the uppermost crust of the Sette-Daban block and West Verkhoyansk folded area, gently sloping refractive boundaries with velocity jump and steep velocity gradients directed towards the underlying medium are detected. The Sette-Daban block has especially high seismic velocities. The refractive boundaries in these blocks are not lithological.

摘要——基于3-DV参考剖面上的共中点（CMP）地震数据，利用折射波动态转换为时间剖面，我们在西伯利亚地台边界区域构建了跨越四个地块的速度剖面褶皱区：Nizhnealdansakaya（Lower Aldan）凹陷、Pre-Verkhoyansk 前渊、Sette-Daban 地块、West-Verkhoyansk 褶皱区。四个结构沿着断层带相互接触，速度模型在这些边界处突然变化。在下阿尔丹凹陷内，构建了两个折射不连续的地形：沉积盖层中的基底边界和中间边界。在 Pre-Verkhoyansk 前渊，在沉积盖层中揭示了一个折射不连续性，而该区域的基底边界位于比观测系统覆盖的深度更大的深度。在这些区块中建立的所有不连续性都是岩性的。在 Sette-Daban 地块的最上地壳和 West Verkhoyansk 褶皱区，探测到具有速度跳跃和陡峭速度梯度的平缓倾斜折射边界指向下层介质。Sette-Daban 区块具有特别高的地震速度。这些块中的折射边界不是岩性的。检测到具有速度跳跃和陡峭的速度梯度指向底层介质的平缓倾斜的折射边界。Sette-Daban 区块具有特别高的地震速度。这些块中的折射边界不是岩性的。检测到具有速度跳跃和陡峭的速度梯度指向底层介质的平缓倾斜的折射边界。Sette-Daban 区块具有特别高的地震速度。这些块中的折射边界不是岩性的。