Numerical modeling of seismic source function for underground explosion in hard rock

The explosion seismic source function in hard rock was numerically simulated with a one-dimensional spherical symmetric finite difference code. The following factors were calculated as the displacement and radial pressure at the elastic radius, the reduced displacement potential and source spectrum. These calculated results are in agreement with the existent results. And the relationship between seismic coupling strength and material shear strength was discussed. It is found that the seismic source strength of underground explosion decreases with the increase of material shear strength.