A Propagation Loss Coefficient Model of Low-Frequency Elastic Wave in Coal Strata Set

Table 1

Parameter of the coal stratigraphic media model.

Parameter	Surrounding rock 1	Coal seam	Surrounding rock 2
(m/s)	4000	2000	4000
(m/s)	2000	1000	2000
ρ (g/cm^3)	2.6	1.3	2.6
H (m)	10	4	10