Fig. 3
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Distribution azimutale de l'énergie des vibrations ambiantes sur les 4 sites. (Haut) Enregistrements sur le compartiment instable. (Bas) Mesures sur le massif stable. La distance radiale correspond à l'axe des fréquences. Le Nord est orienté vers le haut du diagramme (flèche noire). L'échelle de couleur indique l'amplitude de la transformée de Fourier, normalisée à 1 pour chaque site : a : Rubi ; b : La Suche ; c : La Praz ; d : Les Arches.
Azimutal distribution of ambient vibration spectra at the 4 potential rockfall sites. (Top) Seismic records on the unstable rock mass and (Bottom) records on nearby stable rock mass. The circle radius shows the frequency axis. North direction is oriented upwards. The colorscale shows the Fourier transform amplitude normalized to one for each site: a: Rubi; b: La Suche; c: La Praz; d: Les Arches.
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