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

Table 5

Breaking and periodic weighting statistics of key strata.

Periodic weighting		The largest MS		Periodic weighting distance (m)
Date	Type	Date	Energy (J)	Short	Medium	Long
3.3	Long	3.3	6.4 × 10^6	—	—	—
3.7	Short	3.10	5.6 × 10^5	18	44
3.13	Medium	3.13	9.8 × 10^5	26
3.20	Short	3.22	9.5 × 10^5	26	49	142
3.26	Medium	3.26	2.1 × 10^6	23
4.2	Short	4.2	1.3 × 10^6	27	49
4.8	Long	4.8	3.0 × 10^7	22