摘要
This paper focuses on the impact of past mining on public safety.It emphasizes the need to understand the induced seismic hazard and consequently improve the post-mining management procedures and legislations,as many mining sites are located in proximity to populated areas.Due to many challenges and complexity of the post-mining environments,induced seismic hazard nowadays remains largely unknown.However,the return experience of several post-mining sites in recent decades have shown us that the mine flooding and/or degradation of mining works can lead to the stress perturbations,inducing the seismicity and the reactivation of the surrounding geological faults.Hence,it is important to advance the seismic monitor-ing and research of seismicity in flooded post-mining districts.As the number of mine closures worldwide is rising,it can be expected that flooding induced reactivation of the surrounding faults becomes a more often observed phenomenon.We present in this paper the experience of the abandoned flooded coal mine of Gardanne in France,which has been experiencing post-mining seismicity problems since its closure in 2010.We show the results of a recent study of seismic multiplets and clustering of seismic events,as well as their spatio-temporal activity compared to meteorological conditions.These results provide us new insights as well as lead to raising new questions on seismic sources and triggering mechanisms.
