DAS4SHA: Application of Distributed Acoustic Sensing to Seismic Hazard Assessment

**Description of the project

The objective of the project is to evaluate the DAS (Distributed Acoustic Sensing) technology for site characterization. It must be seen as a complement of the ANR MONIDAS project which does not cover this objective. Preliminary numerical tests with sensor networks with only horizontal components, such as networks that can be realized with optical fiber, have shown that it is possible to extract Rayleigh and Love dispersion curves simultaneously. Each fibre crossing represents a two-component sensor. The aim of this project is to verify these findings by means of an experimental device recording ambient vibrations on a campus lawn with an aperture of about 80 m. Conventional measurements of ambient vibrations have already been made during student practical work (Master 1) and will be repeated at the same time as the SAR measurements. The aim is to test the impact of the coupling (aerial fibre, buried or in a duct) but also to evaluate the complexity of this type of installation. This project is centred on methodological developments validated by local experts, made possible thanks to the collaboration between the GRE and Ondes teams.