# Applications of Microseismic Monitoring Technique in Coal Mines: A State-of-the-Art Review  
[PERSON]  
1 State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Beijing 102209, China; [EMAIL_ADDRESS] (F.L. ); koumiaomiao@qut. The microseismic monitoring technique is one of the most effective methods for analyzing, monitoring, and warning of deep coal mining-induced disasters. Though microseismic monitoring has gained increasing popularity regarding the applications in studying mining-induced disasters, it faces numerous technique limitations, e.g., inadequate location accuracy and difficulties in the accurate assessment of coal/rock instabilities. This study aims to highlight the recent achievements of microseismic monitoring in coal mining-induced disasters and propose some possible solutions to the technique limitations, which could be meaningful to promote the development of the microseismic monitoring technique in coal mines. Mining-induced disasters have been extensively studied by researchers using various methods [18; 19; 20; 21]. Field investigation is crucial for studying the coal/rock failure processes in various conditions. Therefore, an efficient field monitoring method for coal/rock fracturing is essential to analyze, warn, and control these disasters. The real-time microseismic monitoring technique is commonly employed in coal mines, which use seismic signals generated by coal/rock masses to investigate the fracture and failure processes [22]. Microseismic monitoring in mines provides a reliable tool to warn and mitigate coal/rock mass instabilities [23]. [PERSON] and [PERSON] first found the phenomenon that stressed rocks in deep mines emit micro-level sounds in the late 1930s [24]. Microseismic monitoring was initially employed to identify the source location of rockburst in South African gold mines in the early 1960s [25; 26]. Since then, the microseismic technique has been rapidly developed for various geotechnical engineering aspects, e.g., mines, tunnels, caverns, slopes, petroleum and natural gas reservoirs, geothermal reservoirs, and nuclear waste repositories [27; 28; 29; 30; 31; 32; 33]. In recent decades, the microseismic monitoring technique has become a practical tool for mine safety management and has been extensively employed in the mines of many countries, e.g., China, Canada, Australia, Poland, America, and India [34; 35; 36; 37; 38; 39]. Studies on the microseismic monitoring technique in coal mines mainly focus on source location methods for microseismic in complex geological scenarios, quantitative interpretation of coal/rock fracturing, early warning of mining-induced disasters, and geotechnical investigations to determine the causes of the disaster. [PERSON] et al. [40] proposed an innovative method to locate microseismic in jointed rock mass of deep coal mines and integrated improved particle swarm optimization and the double-difference location method. [PERSON] et al. [41] used the temporal parameters, energy induces, and frequency of microseismic data to quantify the increased rock pressure caused by the extraction of an ultra-thick coal seam. [PERSON] et al. [42] proposed an early warning method for rockbursts using microseismic, acoustic emission, and electromagnetic radiation parameters based on long short-term memory recurrent neural networks. Roof-fall accidents in Indian coal mines, such as the Churcha mine, the Kothadi mine, and the GDK-11A incline, are closely related to the presence of a hard roof. To enhance the safety of longwall coal mining in India, [PERSON] and [PERSON] [43] incorporated the spatial distribution and magnitude of microseismic and parameters of surface blasting to forecast roof falls. [PERSON] et al. [44] studied the causes of a violent rockburst that occurred at a French coal mine based on microseismic monitoring and in situ stress measurements. [PERSON] et al.