Caverns stability is monitored using a permanent seismic surveillance network operating since 1992. This paper summarized the results concerning underground storage monitoring in a seismo-tectonic context. Over the last 14 years, the seismic network has recorded 1800 internal micro-seismic events (magnitude < 0.5), and 500 external seismic events located close to the site. The objective is to show whether the seismicity is associated to exploitation activities (leaching) or to the local geological tectonic activity.


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