Underground cavities detection from the surface is a crucial problem in geophysics especially to take them into account in civil engineering works and estimate their impact on cities development. Although several geophysical methods can be tested to detect underground cavities, their reliability is limited by several context parameters, like the presence of clay for Ground Penetrating Radar method or like urban sites making the microgravimetric data noisy. Therefore, investigation by seismic Rayleigh waves could be used as a new complementary technique to detect and locate underground cavities, since surface waves are prominent in seismic records (Sheriff R. E. & Geldart L.P., 1995). In this respect, this study has focused on the case of 2D built-up shallow cavities of section about 3 to 12 m2 and buried down to a depth about 3 m. This approach is chosen in the intention of setting up a starting point that we will try to generalize in the future.


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