Mechanism and Energy Evolution Characteristics of Coal Burst in Mining Thick, Deep, and Large Inclined Coal Seams: A Case Study from a Chinese Coal Mine

Table 3

Relation between positive velocity anomalies and coal burst risk level.

Coal burst risk index	Coal burst risk level	Positive velocity anomaly, (%)
0	None	<5
1	Weak	5~15
2	Middle	15~25
3	Strong	>25