远程浅层爆破震源的微震信号频谱能量消散衰减规律研究OA

Based on the seismic monitoring data from the Ganzhou Earthquake Monitoring Center Sta-tion of the Jiangxi Seismological Agency,real-time monitoring of blasting vibrations from different lo-cations and explosive quantities at the Ganzhou Tieshanlong Tungsten Mine was conducted from mul-tiple directions and long distances.The microseismic signals generated by blasting were obtained and analyzed to identify the propagation patterns of blasting vibration signals in medium and far blasting zones.Considering the influence of complex environmental conditions on blasting vibration signals,a Butterworth filter was used to eliminate trend components,and a combination of wavelet denoising and HHT denoising was applied to analyze the time-frequency characteristics,frequency band energy characteristics,and the impact of terrestrial environment on the spectral energy propagation of micro-seismic signals under different monitoring base stations and different blasting events.The study shows that the Sadovsky empirical formula is still applicable to the propagation patterns of blasting vibration signals in the medium and far blasting zones(32-120 km),where:1)in the medium and far blasting zones,signal energy is highly concentrated in the low-frequency band and shifts downward with in-creasing distance from the blast center(R);2)when the distance from the blast center is fixed,sig-nal energy increases significantly with the increase in explosive quantity(Q),and the concentrated frequency band fluctuates within a normal range;3)the attenuation of blasting vibration signals is al-so affected by the surface environment along the propagation path.