Drilling of the seismological station BETHI in Béthincourt (Meuse) ; Réalisation du forage de la station sismologique BETHI à Béthincourt (Meuse)

Dans le cadre de l’intégration aux dispositions européens EPOS, Résif s'est transformé en octobre 2023 en Epos-France, une nouvelle infrastructure de recherche aux contours thématiques plus larges et en accord avec ceux de sa grande sœur européenne. ; Realization of the drilling of the seismological station BETHI in the commune of Béthincourt (Meuse) near Verdun. The compressed air drill is installed on a former quarry used by the municipality to rebuild the village after the Second World War. The drilling was carried out in several stages in order to verify the absence of old shells in the ground. Beyond a depth of 5 meters, the soil, consisting of a mixture of water and limestone that mixed with the clay of the upper layer, bogged down the compressed air system and complicated the work. The drilling was carried out in October 2021 at a depth of 12m with the equipment of the Bureau de recherches géologiques et minières (BRGM) and its technical team with the assistance of the team of the seismological observatory of the Ecole et Observatoire des Sciences de la Terre (EOST) of Strasbourg. Because of technical problems due to the site conditions, the well was finalized with a depth of 9m. The seismological station BETHI has been integrated into the Permanent Broadband Network (RLBP) in August 2021. The RLBP is part of Résif, a national research infrastructure dedicated to the observation and understanding of the Earth's internal structure and dynamics. Résif is based on high technology observation networks, composed of seismological, geodesic and gravimetric instruments deployed in a dense manner on the whole French territory. The data collected allow to study with a high spatio-temporal resolution the ground deformation, the superficial and deep structures, the seismicity at the local and global scale and the natural hazards, and more particularly the seismic ones, on the French territory. Résif is part of the European (EPOS - European Plate Observing System) and global systems of instruments allowing to image ...