Analysis of Acoustic Wave Frequency Spectrum Characters of Rock Mass under Blasting Damage Based on the HHT Method

Table 4

Ratios of energy taken up by different frequency bands.

MP	Frequency band (Hz)
	0∼50	50∼100	100∼200	200∼300	300∼400	>400
1	77.3	6.8	11.4	1.6	0.3	2.6
2	42.8	20.1	27.0	7.1	0.6	2.4
3	43.7	34.1	16.1	2.3	0.9	2.8
Mean	54.6	20.3	18.2	3.7	0.6	2.6