Focus Energy Determination of Mining Microseisms Using Residual Seismic Wave Attenuation in Deep Coal Mining

Table 1

Variation of the basic characteristic information of the microseismic specimen.

	Distance; (m)	Arrival time; (s)	PPV; (mm/s)		Amplitude; (μm)		Dominant frequency; (Hz)		Wave energy; (J)
			Original	Denoised	Original	Denoised	Original	Denoised	Original	Denoised
sw1	453.32	0.520	0.622	0.594	2.91	2.88	50.828	49.400	4928.96	4421.40
sw2	480.40	0.550	0.286	0.264	2.74	2.70	33.981	32.553	845.57	786.92
sw3	575.26	0.556	0.204	0.210	1.84	1.81	32.553	32.838	606.54	589.29
sw4	336.77	0.576	0.465	0.458	2.64	2.48	38.835	37.407	6323.37	5781.94
sw5	693.23	0.602	0.091	0.096	1.20	1.21	15.420	11.422	133.40	127.11
sw6	1202.98	0.652	0.020	0.020	3.17	3.15	13.706	13.706	17.86	16.95
sw7	1029.07	0.684	0.029	0.027	4.17	4.16	11.708	11.708	31.47	28.59
sw8	1326.37	0.712	0.024	0.025	4.03	3.98	7.139	7.139	18.18	16.39
sw9	1178.75	0.730	0.033	0.034	7.24	7.09	11.993	11.993	23.88	22.17
sw10	1447.96	0.744	0.015	0.014	2.05	2.04	15.134	15.134	9.26	8.81

magnitude is slightly influenced by the built-in velocity threshold of the monitoring firmware.