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Characterization of the site conditions near the seismological station Résif-Rap CGLR at the foot of Mount Pelee in Martinique on March 13, 2020


Description : Systematic characterization of site conditions is a fundamental component for better use of data in seismic hazard studies and ground motion prediction. This is a recommendation issued after the H2020 EU-SERA project and followed by many instrumented countries in Europe. The measurement and processing protocol aims to determine the properties of the subsoil under the stations, i.e. the shear wave velocity profiles, from which a number of proxies widely used in seismic hazard are deduced (soil class EC8, SV30, H800, etc.). This protocol was applied to about sixty Résif-RAP stations in France and Martinique. To characterize a single station, the protocol requires a team of 6 to 8 people and 300 kg of equipment on site for a day 3 and 4 , then 3 to 5 days of data processing by an expert. This photo shows a site condition characterization operation at the CGLR station at the foot of Mount Pelee in Martinique on March 13, 2020. We can see the installation of small circular AVA arrays of radius 5 and 15 m near the station. Résif-Rap is one of the actions of the French seismological and geodetic network Résif, , a national research infrastructure dedicated to the observation and understanding of 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. The data collected 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 events, on French territory. Résif is part of the European (Epos - European Plate Observing System) and global systems of instruments used to image the Earth's interior as a whole and to study many natural phenomena.
Contributor : Véronique Bertrand Connect in order to contact the contributor
Submitted on : Wednesday, April 21, 2021 - 9:19:45 AM
Last modification on : Friday, January 14, 2022 - 3:41:47 AM