Effect of the Initial Support of the Tunnel on the Characteristics of Rockburst: Case Study and Mechanism Analysis

Table 3

Statistics of microseismic event types in development stage of rockburst.

Rockburst	Event type by seismic energy			Event type by apparent volume
	Small	Medium	Large	Small	Medium	Large
Low stiffness	13.0%	45.4%	41.6%	57.4%	25.0%	17.6%
High stiffness	25.2%	40.5%	34.3%	42.9%	41.7%	15.4%