Abstract
The basement of the Zaouit Ech Cheikh city shelters a dense network of underground cavities. These sub-surface voids make many buildings or infrastructures unstable or cause them to collapse. To test the efficiency of geophysical methods in detecting cavities, 2D electrical tomography and ground-penetrating radar (GPR) studies were carried out along the main streets of the city. The obtained results reveal the existence of a large number of underground cavities throughout the investigated area. They also show the interest of such combined geophysical methods as tools for mapping underground holes in an urban area.
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