Electrical resistivity tomography contribution to the characterization of underground cavities in the region of Safi, MoroccoToufiq Ait Elfakih, Lahcen Bahi, Ahmed Akhssas, Latifa Ouadif and Rachid BenkmilE3S Web Conf., 150 (2020) 03023DOI: https://doi.org/10.1051/e3sconf/202015003023