The time-frequency c haracteristics of earthquakes,blasting and collapses in Daixian and Datong are obtained by using three time-frequency analysis methods of short-time Fourier transform,wavelet transform and S-transform.The common criteria are obtained that the frequency band of seismic events is wider than the other two,concentrated in 0～10 HZ,while the band frequency domain of blasting and collapse is narrower,mostly concentrated in 0～2 HZ.The main energy value of collapse is higher than that of earthquake and blasting.
维普
万方数据