Investigation into Mechanism of Floor Dynamic Rupture by Evolution Characteristics of Stress and Mine Tremors: A Case Study in Guojiahe Coal Mine, China

Table 2

The parameters of blocks.

Lithology	Density/(Kg/m^3)	Bulk modulus/GPa	Shear modulus/GPa
Fine sandstone	2550	18.4	9.6
Siltstone	2510	12.2	6.6
Mudstone	2500	8.1	3.1
3^# coal	1400	3.05	2.1
Mudstone	2500	8.1	3.1
Siltstone	2510	12.2	6.6
Fine sandstone	2550	18.4	9.6