Terrestrial interferometric radar to monitor the deformation fields of the Aiguilles landslide ; Radar interférométrique terrestre en opération de suivi des champs de déformation du glissement de terrain d'Aiguilles

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. ; Installation of a ground interferometric radar to quantify the deformation fields at very high temporal resolution on the Aiguillles landslide. The analysis of the time series of the phase images allows, by a permanent reflector interferometric processing, to document every 5 minutes the gravitational activity of the unstable slope with an accuracy of a few millimeters. The time series created are 7/24.The Aiguilles (Pas de l'Ours) landslide is located in the Queyras valley, between the villages of Abriès and Les Aiguilles. The landslide developed in unconsolidated shales and moraines. The total mass in motion is estimated at 10,106 m3, with a width of 1 km and a length of 600 m. A sudden acceleration can cause a landslide in the Guil River. The slope is currently one of the largest active landslides in the French Alps. Since April 2017, numerous landslides, mudflows and significant deformations of the slope and road at the foot of the slide have been observed. The data set acquired during the landslide consists of seismological and toographic observations.This observation site is part of Résif, a national research infrastructure dedicated to observing and understanding the structure and dynamics of the Internal Earth. Résif is based on high-tech observation networks, composed of seismological, geodetic and gravimetric instruments deployed in a dense manner throughout France. These data make it possible to study with high spatial and temporal resolution the deformation of the ground, surface and deep structures, seismicity on a local and global scale and natural hazards, and more particularly seismic hazards, on French territory. Résif is integrated into European (EPOS - European Plate Observing System) and global systems of instruments for imaging the Earth's ...