波速测量得到的是一段地层中的平均速度,由于地震波初至时刻难于准确确定等原因,测量结果存在较大误差.采用共反射点的多次覆盖技术能更准确地测定地震波的传播速度,但必须准确掌握反射面的深度.在不准确掌握反射面厚度的情况下,提出利用倾斜截面测定波速.这种技术要求掌握反射截面的倾角,特别适合有断层出露和基岩出露的地区.把上述技术应用于龙门山断层区,测得了该区地震波传播速度,说明利用倾斜反射截面测定波速是有价值的尝试. The average velocities measured in a layer of velocity are obtained by wave velocity measurement, which have large errors due to the difficulty in accurately determining the initial arrival time of seismic waves, etc. The multiple coverage technique using common reflection points can accurately measure the propagation velocity of seismic waves, Must accurately grasp the depth of the reflection surface.In the case of inaccurate grasp of the thickness of the reflection surface, the use of oblique section determination of wave velocity is proposed.This technique requires that the inclination of the reflection section be grasped, and is particularly suitable for the areas where the faults are exposed and the bedrock is exposed. The above technique is applied to the Longmenshan fault zone and the seismic wave propagation velocity in this area is measured. It is valuable to use the inclined reflection cross section to measure the wave velocity.