1. State Key Laboratory of Coal Resources and Safe Mining, China UnTversity of Mining and Technology, Xuzhou 221116, China
2. Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention, School of Mines, China University of Mining and Technology, Xuzhou 221116, China
3. School of Mines and Geology, Xinjiang Institute of Engineering, Urumqi 830091, China
4. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China