### Spatial Evolution of Mining-Induced tremors near Main Roadways in Gaoijapu Coal Mine  
Figure 3 shows the spatial evolution of mining-induced tremors when mining takes place on both sides of the main roadway. According to Figure 3a, during the period from 1 January 2018 to 31 March 2018, the distances between the mining positions of the 104 and 203 working faces and the main roadways were 890 m and 860 m, respectively. Although the distances were very large, tremors greater than 1 \(\times\) 104 J frequently occurred in the main roadways. As is shown in Figure 3b, during the period from 1 April 2018 to 30 June 2018, as the two working faces were mined toward the main roadways, the distances between the mining positions of the 104 and 203 working faces were about 760 m and 710 m, respectively. It could be seen that the intensity and quantity of mining-induced tremors \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Rock Burst No.** & **Rock Burst Date** & **Mining Seismic Energy** & **Rock Burst Damage** \\ \hline R\({}_{1}\) & 3 February 2017 & \textbackslash{1} 7.3 \(\times\) 10\({}^{5}\) J & \textbackslash{1} Floor heave 1 m \\  & & \textbackslash{2} 1.4 \(\times\) 10\({}^{5}\) J & \textbackslash{2} Floor heave 0.5–1 m \\ R\({}_{2}\) & 1 November 2017 & \textbackslash{1} 1.9 \(\times\) 10\({}^{5}\) J & \textbackslash{1} Floor heave 0.2–0.4 m \\  & & \textbackslash{2} 2.9 \(\times\) 10\({}^{5}\) J & \textbackslash{2} Floor heave 0.6 m \\  & & \textbackslash{1} 8.8 \(\times\) 10\({}^{5}\) J & \textbackslash{1} Root fall 0.2 m and floor heave 0.3–1 m \\ R\({}_{3}\) & 16 August 2018 & \textbackslash{2} 1.2 \(\times\) 10\({}^{5}\) J & \textbackslash{2} Floor heave 0.3 m \\  & & \textbackslash{3} 8.8 \(\times\) 10\({}^{6}\) J & \textbackslash{2} Floor heave 0.5–1.5 m \\  & & \textbackslash{1} 9.0 \(\times\) 10\({}^{5}\) J & \textbackslash{1} Floor heave 0.2–0.3 m \\ R\({}_{4}\) & 4 November 2018 & \textbackslash{2} 1.9 \(\times\) 10\({}^{5}\) J & \textbackslash{2} Root fall 0.2 m \\ R\({}_{5}\) & 1 July 2019 & \textbackslash{1} 2.1 \(\times\) 10\({}^{5}\) J & \textbackslash{1} Root fall 0.1 m \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The occurrence of rockbursts in Gaoijapu coal mine’s main roadways. Figure 2: The damage caused by rockbursts to the main roadways in the Gaoijapu coal mine: (**a,b**) top and partially enlarged views of rockburst accidents in main roadways; \(R_{1}\) the roof fall and floor heave accidents on 16 June 2018; \(R_{2}\) the roof fall accident on 1 July 2019; \(R_{3}\) the roof fall and floor heave accidents on 15 August 2018 and the roof fall accident on 7 September 2018; \(R_{4}\) the floor heave accident on 2 April 2018, the floor heave accident on 6 April 2018, and the roof fall accident on 12 April 2018; \(R_{5}\) the roof fall and floor heave accidents on 4 November 2018; (**c,d**) photos of the rockburst damage. increased significantly as the distance decreased. In Figure 3c, during the period from 1 July 2018 to 31 March 2018, as the 104 and 203 working faces approached the main roadways, the mining tremor activities near the main roadway became more intense. On 16 August 2018, a rockburst occurred in the main roadways, with a maximum floor heave volume of 1.5 m (as is shown in Figure 2), and caused damage to the main roadways within a radius of 300 m. At this time, the distances between the two working faces and this rockburst were about 650 m and 760 m, respectively. This accident led to the complete shutdown of the coal mine. On 20 October 2018, the mine resumed production. Subsequently, mining was completed at the 203 working face and mining began at the 204 working face, while the mining operations at the 104 working face were nearing completion. Because the influence of mining at the 104 and 203 working faces on the main roadways had not completely dissipated, the mining at the 204 working face intensified the mining tremor activities near the main roadways.