Random property of ground vertical vibration velocity induced by near ground explosion seismic effect

A general method to describe the ground velocity induced by explosion seismic is introduced, which resolves the velocity into a product of a determined amplitude attenuation function and a random response function. A brief analysis is presented on the measurements of the random velocity fluctuation caused by the near ground explosion seismic effect. The analyses of the experimental results show that the log-log power spectrum of the random velocity fluctuation follows the linear relation with the spectral exponent between 2.51-2.85 within the frequency range 10-700 Hz approximately, and then an evolutionary power spectrum equation of the non-stationary ground vibration velocity is yielded. Otherwise, the theoretical modeling results of the ground vertical velocity are obtained, which agree with experimental results statistically.