Seismic techniques

The GéoEND laboratory is involved in several research partnerships dedicated to the use of DAS (Distributed Acoustic Sensing) technology for near-surface seismic measurements. These projects focus in particular on the feasibility of passive and active seismic methods for levee monitoring (SEEWALL project), on high-resolution imaging of urban subsurface structures (URBIDAS project), and on the study of fibre–soil coupling and the imaging of buried structures in both anthropogenic and natural environments (PEXDAS and IMADAS projects).

Ambient seismic noise, originating from various high-frequency sources such as road traffic, wave action, or wind effects on structures, allows for the investigation of the near surface.

This approach relies on the reconstruction of surface waves through noise correlation and provides an alternative to active sources for subsurface imaging and monitoring over periods ranging from a few hours to several years. As part of the laboratory's activities, this method is used both for probing the near surface and for monitoring structures such as sea dikes.