AlpArray-FR is the French component of AlpArray, associating ISTerre in Grenoble, IPGS in Strasbourg and Geoazur in Nice. Funded by the French National Research Agency, this project has enabled the installation and maintenance of 63 temporary land-based stations from Alsace to Corsica and eight seismometers for the Mediterranean seabed. It also accelerated the installation of 17 permanent stations of Résif-RLBP, and eight temporary stations became permanent sites. Most of the temporary land-based stations were equipped with broadband instruments from the Résif-Sismob park, while the OBS Insu-IPGP park provided seven broadband instruments and Geoazur the eighth. 29 AlpArray seismometers were deployed in the Ligurian Sea and western Corsica in June 2017 by a Franco-German scientific team (ISTerre, IPGP, Geomar Kiel) on board the oceanographic vessel Pourquoi-Pas? After eight months of immersion in water depths from 1100 to 2800 m, the instruments were recovered in February 2018 from the German oceanographic vessel Maria S. Merian.
The data are currently being processed in all participating countries. To date, the main contribution of the French teams has been in the field of environmental noise tomography. The AlpArray-FR data have been integrated into earthquake localization by the BCSF-ReNaSS, contributing to a better knowledge of seismicity. Thirty stations were still operating at the time of the Teil earthquake (11/11/19), including one located 9 km from the epicenter. The recordings were made available to the community.
Read the full article in Resif Newsletter n°18 (french)