An Experiment Monitoring Signals of Coal Bed Simulation under Forced Vibration Conditions

Figure 32

Effective microseism signals for certain working conditions (4# sensor).

(a) Effective signals in working condition 29

(b) Effective signals in working condition 35

(c) Effective signals in working condition 37

(d) Effective signals in working condition 41

(e) Effective signals in working condition 47