The study of propagation law of microseismic signal in layered rock mass is of great practical significance for realizing accurate source location. In natural rock mass

the propagation velocity of microseismic signal in rock strata is not only affected by its internal factors

namely the physical properties of rock itself

but also by external factors

such as geological structural plane

fault and goaf. Through laboratory experiments

the propagation law of microseismic signals in different strata and near mined-out areas was studied. The results show that the wave velocity decreases as the propagation distance increases

and the attenuation of the wave velocity is slower with higher rock density. The attenuation ratio of propagation velocity is bigger when microseismic signal goes through more structural planes. The attenuation of energy is consistent with that of the wave velocity. It takes longer for microseismic signals to pass through a goaf with a larger cross-sectional area

whereas

the larger the values of the physical properties such as the density and elastic modulus of the rock around the goaf

the less the wave velocity attenuation when the microseismic signal passes. Marginal spectrum analysis results show that faults have a stronger obstruction to micro-seismic signals with higher frequency.