Ambient Noise Cross Correlation Analysis of the Mas d’Avignonet Landslide, Isère, France

The ambient noise cross correlation technique is applied to a landslide affecting clayey deposits. The 2-5 Hz frequency part of the Rayleigh wave group velocity dispersion curves obtained from cross correlation are completed up to 7 Hz by the ones computed from explosive shot signals. Local group velocity dispersion curves are derived by tomographic inversion, and inverted to obtain a 3D Vs image of the landslide. Despite the complex wave propagation in the Eastern part of the landslide and the sparse ray coverage, estimated velocities in the Western part and first order features are in good agreement with previous investigations.