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 of geophysical and geochemical quantities, so as to identify their internal relationships. Based on the above research, the causes and physical mechanisms of mine earthquakes can be revealed, the trend of mine seismic activity assessed, prevention and control countermeasures for mine seismic hazards proposed, and forecasting methods for mine earthquakes explored, providing support for emergency rescue and disaster relief decision-making.
2 Research Contents of Mine Seismicity
1) Precise location of mine earthquakes. On the basis of preliminary location by on-duty staff, further improve location accuracy, carry out correlation analysis with geographic information, and determine the medium conditions in major zones where mine earthquakes occur.
2) Adopt focal mechanism solutions inverted from waveforms of mine seismic events to determine the kinematic process of mine earthquake rupture and mechanical characteristics of seismic sources.
3) Study medium conditions in event-concentrated areas via load-unload response ratio analysis and conduct hazard assessment.
4) Investigate the activity patterns and precursory characteristics of mine earthquakes through mine seismic sequence analysis.
5) Apply moment tensor inversion for mine earthquakes to analyze rupture processes and kinematic characteristic parameters of faults.
6) Carry out physical analysis of mine earthquakes and correlation analysis with corresponding physical fields to explore the relationship between mine earthquake occurrence and stress state.
7) Identify precursory physical parameters prior to strong mine earthquakes and discuss methods and approaches for mine earthquake forecasting.
3 Applications of Geolight Seismic Monitoring Equipment in Coal Mines
1) Datong Coal Mine Seismic Monitoring System
2) Fuxin Coal Mine Seismic Monitoring System
3) Tai’an Huafeng Coal Mine Seismic Monitoring System
4) Yanzhou Coal Mine Seismic Monitoring System
5) Guangxi Mine Seismic Monitoring System