Abstract:In order to study the frequency characteristics of mining-induced microseismic signals in hard rock mines, spectrum analysis combined with energy spectral density method was used to analyze the vibration signals generated by microseismic activities during mining, and the energy distribution of microseismic signals induced by hard rock bodies was obtained. The results show that the attenuation of the microseismic wave propagation affects the change of the energy proportion in each frequency interval. As the propagation distance increases, the energy proportion in the low frequency region increases and the energy proportion in the middle and high frequency regions decreases. When the wave propagates to about 200m, the frequency interval with higher energy proportion changes significantly. In the wave propagation range of 200m to 500m, the frequency range with high energy proportion is mainly in the range of 20-40Hz, and the interval does not change much and is relatively stable. Using the frequency characteristics of the microseismic wave propagation process induced by the hard rock mining mentioned above has certain reference value for improving the identification of microseismic events induced by the hard rock body and the filtering of the focal mechanism calculation.