Study on Characteristics of Mining Earthquake in Multicoal Seam Mining under Thick and Hard Strata in High Position

Figure 6

Microseismic and mining earthquake events spatial distribution of plane and profile during upper coal seam mining in 10302 working face. (a) Energy level 10² J < E < 10³ J. (b) Energy level 10³ J < E < 10⁴ J. (c) Energy level 10⁴ J < E < 10⁵ J. (d) Energy level E > 10⁵ J.

(a)

(b)

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(d)