Mechanism and Evolution Control of Wide Coal Pillar Bursts in Multithick Key Strata

Figure 12

Spatial distribution of MS events before “4.8” rock burst. (a) Date: April 1 to April 2. (b) Date: April 3 to April 4. (c) Date: April 5 to April 6. (d) Date: April 7 to April 8.

(a)

(b)

(c)

(d)