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DOI : 10.1201/b16816-6

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. Hz, 3 m 15 m?80 m 20 m?30 m Sledge hammer (I beam for S-W) 130 m (P-W) 50 m

&. Bruno and . Marillier, Un point de tir test (haut) montre la présence de deux hyperboles de réflexion autour de 90 et 50 ms qui présentent un faible rapport signal sur bruit Selon les auteurs, celles-ci correspondent respectivement à l'interface gypse-schiste et à la surface de glissement. Après un traitement des données classique l'image du bas montre la section sismique après sommation migrée par FK (vitesse constante de 2000 m.s -1 ) ainsi que l'interprétation géologique. La réflexion sur la surface de glissement apparaît proche de la limite de résolution de l'image, avec l'autorisation de Springer Science and Business Media, 2000.

. Méric, seismic (b) tomography sections acquired at across the western limit of the large rocky landslide of Séchilienne " (French Alps) affecting micaschists RMS values after inversion are 5% (a) and 2% (b) Out of the unstable mass, the image shows a strong vertical velocity, with Vp values ranging from 500 m/s at the surface to 4000 m/s at 25 m depth (sound bedrock) and a significant lateral velocity eastward decrease (from 4000 m/s to 2000 m/s) delineating the landslide limit. The electrical image (Wenner array configuration, RES2DINV inversion software) shows an eastward resis tivity increase, 2005.

L. Valeurs, Hors de la masse instable, l'image montre une vitesse verticale forte, avec Vp variant de 500 m/s vers la surface à 4000 m/s à la profondeur de 25 m (roche en place saine), ainsi qu'une diminution de vitesse latérale significative (de 4000 m.s -1 à 2000 m.s -1 ) vers l'est, séparant la limite d'éboulement. L'image électrique (configuration de Wenner, logiciel d'inversion RES2DINV) montre également une augmentation de la résistivité vers l'est