[Retracted] Research on Temporal and Spatial Distribution Characteristics of Microseismic Events of Slip-Type Rockburst

Table 1

Determination method of the rockburst grade.

Options	None	Slight	Moderate	Relatively strong	Strong
Moment magnitude	−2.5～−1.5	−1.5～0	0～1.0	1.0～2.5	＞2.5
Number of microseismic events	＜5	5～10	10～20	20～40	＞40
Determination of rockburst grade	The rockburst grade is comprehensively determined by the moment magnitudes and the number of daily microseismic events. When the actual situation is inconsistent with the table, the cross determination method is used. For example, ① the moment magnitude ranges from −2.5 to −1.5, the number of microseismic events reaches 5 to 10 times, and the rockburst grade is from none to slight; ② the moment magnitude ranges from 0 to 10, the number of daily microseismic events is 5 to 10 times, and the rockburst grade is from slight to moderate.