Fig. 12

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À gauche, succession régulière de deux matériaux terrestres (ρ1, E1, ρ2, E2) en couches horizontales, avec une périodicité a. À droite, principe du diagramme de dispersion pour une structure 1D constituée d'une alternance de deux matériaux (d'après Brûlé et al., 2015b).
Left, regular succession of two earth layered materials (ρ1, E1, ρ2, E2), with a periodicity a. Right, principle of dispersion diagram for a 1D structure consisting of an alternation of two materials (from Brûlé et al., 2015b).
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