Study on Response Characteristics of Surrounding Rock Rupture Microseismic Events during Coal Roadway Excavation

Figure 6

Comparison of S-transform results of different microseismic events. (a) S-transform cloud map of rock. (b) S-transform cloud map of rock. (c) S-transform cloud map of coal fracture caving. (d) S-transform cloud map of coal caving. (e) S-transform cloud map of noise signal.

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