Abstract: In order to explore the influence of local sag terrain on the propagation of explosive seismic waves,the propagation characteristics of explosion seismic waves in square,V-shaped and U-shaped terrains are studied by using three-dimensional finite element numerical simulation method.The study found that for the same topography,the order of the velocity peaks of the measuring points is V_x>V_y>V_z; in the case of the same H and W,the U-shaped terrain has the best damping effect; The frequency domain width and the dominant frequency are affected by the different local topography .After the seismic wave passes through the V-shaped and U-shaped terrains,the dominant frequency moves toward the high frequency direction,and the dominant frequency moves toward the low frequency direction after the square terrains.

Key words: Sag terrain, Explosion seismic wave, Numerical simulation, Peak particle velocity