1 Objectives and Significance of Mine Seismic Monitoring
Through surface and underground observation of mine earthquakes, the epicenter location, magnitude, focal mechanism and physical characteristics of seismic sources can be determined. Combined monitoring of mine earthquakes together with other underground geological activities, geophysical and geochemical parameters enables statistical analysis of correlations between mine seismicity, mining progress and variations in geophysical and geochemical indicators, so as to identify their intrinsic relationships.
Based on the above research, the triggering causes and physical mechanisms of mine earthquakes can be clarified, the trend of mine seismic activity can be assessed, prevention and control strategies for mine seismic hazards can be proposed, and methods for mine earthquake prediction can be explored, providing support for emergency rescue and disaster relief decision-making.
2 Research Contents of Mine Seismic Monitoring
1) Precise location of mine earthquakes. On the basis of preliminary location by duty personnel, further improve location accuracy. Combined with geographic information analysis, characterize the medium properties in major zones where mine earthquakes occur.
2) Adopt focal mechanism solutions inverted from mine earthquake waveforms to determine the kinematic process of fracture and mechanical characteristics of seismic sources.
3) Study medium conditions in seismically concentrated areas via load-unload response ratio analysis and carry out hazard assessment.
4) Investigate activity patterns and precursory characteristics of mine earthquakes through seismic sequence analysis.
5) Analyze fracture processes and fault kinematic parameters of mine earthquakes by means of seismic moment tensor inversion.
6) Conduct physical analysis of mine earthquakes and correlation analysis with corresponding physical fields to reveal the relationship between mine earthquake occurrence and stress state.
7) Identify precursory physical parameters before strong mine earthquakes and discuss feasible methods and approaches for mine earthquake prediction.
3 Application of Geolight Seismic Monitoring Equipment in Coal Mines
1) Seismic Monitoring System of Datong Coal Mine
2) Seismic Monitoring System of Fuxin Coal Mine
3) Seismic Monitoring System of Tai’an Huafeng Coal Mine
4) Seismic Monitoring System of Yanzhou Coal Mine
5) Guangxi Mine Seismic Monitoring System