In terms of equipment, the main goal of this project is to build a dense multi-physics array, which will be a unique platform of this type in Europe :

• 100 independent wireless electrical stations, GPS synchronized, able to measure the 2 electrical field components at a few kilohertz sampling rate. These passive stations will be combined with an active source using an IRS current generator (also GPS synchronized). This platform will image and monitor resistivity and induced polarization (the ability of porous rocks to store reversibly electrical charges) in 3D down to 1 km. This equipment is co-funded by EDYTEM at USMB (100 k€).

• 100 independent wireless geophones able to measure the 3 components of the seismic field, in continuous mode and GPS synchronized, both using passive ambient noise and active sources. Note that 65 geophones have recently been purchased by the INSU national equipment (SISMOB) and the present project aims at increasing the network up to 100 seismic stations with the purchase of 35 new 3-component wireless geophones.

This electric and seismic platform will be combined with geophysical equipment designed for subsurface imaging (and already present at ISTerre and IGE) according to the studied sites (Ground Penetrating Radar, Geodesy, Nuclear Magnetic resonance, EM methods). Thanks to these original multi-physics arrays, RESOLVES aims at investigating several subsurface dynamic processes in the next two years, including field experiments outside Europe or IRD sites. Within this project, we propose to focus on four different objects at different scales characterized by difficult or urban conditions that wireless technology can tackle. These geophysical objects (described below) are related to geothermal exploration (Icelandic volcano) and to regional emblematic case studies including natural hazard (Séchilienne landslide), water resources (water supply of Lyon) and glaciology (Argentière glacier).

Updated on 21 mars 2018