{"id":109803,"date":"2025-06-09T11:24:32","date_gmt":"2025-06-09T09:24:32","guid":{"rendered":"https:\/\/geosurveys.it\/?page_id=109803"},"modified":"2026-02-27T10:52:52","modified_gmt":"2026-02-27T09:52:52","slug":"autres-methodes-sismiques","status":"publish","type":"page","link":"https:\/\/geosurveys.it\/fr\/autres-methodes-sismiques\/","title":{"rendered":"Autres m\u00e9thodes sismiques"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row row_height_percent=\u00a0\u00bb60&Prime; back_color=\u00a0\u00bbcolor-172302&Prime; back_image=\u00a0\u00bb105186&Prime; kburns=\u00a0\u00bbyes\u00a0\u00bb overlay_alpha=\u00a0\u00bb40&Prime; gutter_size=\u00a0\u00bb4&Prime; column_width_percent=\u00a0\u00bb100&Prime; shift_y=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; content_parallax=\u00a0\u00bb0&Prime; uncode_shortcode_id=\u00a0\u00bb159769&Prime; back_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_column column_width_percent=\u00a0\u00bb100&Prime; position_horizontal=\u00a0\u00bbleft\u00a0\u00bb position_vertical=\u00a0\u00bbmiddle\u00a0\u00bb gutter_size=\u00a0\u00bb3&Prime; style=\u00a0\u00bbdark\u00a0\u00bb overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; width=\u00a0\u00bb1\/1&Prime; uncode_shortcode_id=\u00a0\u00bb704479&Prime;][vc_row_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; style=\u00a0\u00bbdark\u00a0\u00bb overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; width=\u00a0\u00bb1\/1&Prime; uncode_shortcode_id=\u00a0\u00bb103021&Prime;][vc_custom_heading heading_semantic=\u00a0\u00bbh1&Prime; text_font=\u00a0\u00bbfont-377884&Prime; text_size=\u00a0\u00bbh1&Prime; text_weight=\u00a0\u00bb500&Prime; css_animation=\u00a0\u00bbcurtain-words\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb839220&Prime;]Autres m\u00e9thodes sismiques[\/vc_custom_heading][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row row_height_percent=\u00a0\u00bb0&Prime; override_padding=\u00a0\u00bbyes\u00a0\u00bb h_padding=\u00a0\u00bb2&Prime; top_padding=\u00a0\u00bb2&Prime; bottom_padding=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; gutter_size=\u00a0\u00bb4&Prime; column_width_percent=\u00a0\u00bb100&Prime; shift_y=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; content_parallax=\u00a0\u00bb0&Prime; uncode_shortcode_id=\u00a0\u00bb179310&Prime;][vc_column column_width_percent=\u00a0\u00bb100&Prime; position_horizontal=\u00a0\u00bbleft\u00a0\u00bb position_vertical=\u00a0\u00bbmiddle\u00a0\u00bb gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; width=\u00a0\u00bb1\/1&Prime; uncode_shortcode_id=\u00a0\u00bb953999&Prime;][vc_row_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; css_animation=\u00a0\u00bbbottom-t-top\u00a0\u00bb animation_delay=\u00a0\u00bb300&Prime; toggle=\u00a0\u00bbyes\u00a0\u00bb max_height=\u00a0\u00bb450&Prime; max_height_mobile=\u00a0\u00bb60vh\u00a0\u00bb closed_txt=\u00a0\u00bbLire la suite\u00a0\u00bb btn_margin=\u00a0\u00bbsm\u00a0\u00bb open_txt=\u00a0\u00bbChiudi\u00a0\u00bb btn_margin_open=\u00a0\u00bbsm\u00a0\u00bb btn_align=\u00a0\u00bbleft\u00a0\u00bb width=\u00a0\u00bb1\/3&Prime; uncode_shortcode_id=\u00a0\u00bb113960&Prime;][vc_single_image media=\u00a0\u00bb108763&Prime; media_width_percent=\u00a0\u00bb100&Prime; uncode_shortcode_id=\u00a0\u00bb100568&Prime;][vc_custom_heading heading_semantic=\u00a0\u00bbh3&Prime; text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb703687&Prime;]Enqu\u00eate sismique ESAC[\/vc_custom_heading][vc_column_text uncode_shortcode_id=\u00a0\u00bb196407&Prime;]L&rsquo;\u00e9tude sismique passive de l&rsquo;ESAC (Extended Spatial Autocorrelation) permet de d\u00e9terminer la variation de la vitesse des ondes de cisaillement (Vs) en fonction de la profondeur, ce qui est utile pour la mod\u00e9lisation du sous-sol et la classification sismique des sols. Il s\u2019agit d\u2019une technique passive qui repose sur l\u2019analyse du bruit ambiant enregistr\u00e9 par une s\u00e9rie de g\u00e9ophones, g\u00e9n\u00e9ralement dispos\u00e9s selon deux branches orthogonales ou selon des configurations g\u00e9om\u00e9triques plus complexes. L\u2019enqu\u00eate ESAC est particuli\u00e8rement utilis\u00e9e dans les \u00e9tudes de microzonage sismique, gr\u00e2ce \u00e0 sa capacit\u00e9 \u00e0 explorer des profondeurs sup\u00e9rieures \u00e0 celles permises par d\u2019autres m\u00e9thodes passives.[\/vc_column_text][\/vc_column_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; css_animation=\u00a0\u00bbbottom-t-top\u00a0\u00bb animation_delay=\u00a0\u00bb600&Prime; toggle=\u00a0\u00bbyes\u00a0\u00bb max_height=\u00a0\u00bb450&Prime; max_height_mobile=\u00a0\u00bb60vh\u00a0\u00bb closed_txt=\u00a0\u00bbLire la suite\u00a0\u00bb btn_margin=\u00a0\u00bbsm\u00a0\u00bb open_txt=\u00a0\u00bbChiudi\u00a0\u00bb btn_align=\u00a0\u00bbleft\u00a0\u00bb width=\u00a0\u00bb1\/3&Prime; uncode_shortcode_id=\u00a0\u00bb161193&Prime;][vc_single_image media=\u00a0\u00bb108766&Prime; media_width_percent=\u00a0\u00bb100&Prime; uncode_shortcode_id=\u00a0\u00bb151687&Prime;][vc_custom_heading heading_semantic=\u00a0\u00bbh3&Prime; text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb123381&Prime;]Prospection sismique MASW[\/vc_custom_heading][vc_column_text uncode_shortcode_id=\u00a0\u00bb700972&Prime;]La m\u00e9thode M.A.S.W. (Multichannel Analysis of Surface Waves) permet, \u00e0 travers l\u2019acquisition des ondes de surface de Rayleigh et de Love, enregistr\u00e9es par une s\u00e9rie de g\u00e9ophones dispos\u00e9s le long d\u2019un dispositif lin\u00e9aire et connect\u00e9s \u00e0 un sismographe multicanal, de reconstituer un profil vertical des vitesses des ondes de cisaillement (Vs). Les ondes de surface sont facilement g\u00e9n\u00e9r\u00e9es par une source sismique, telle qu\u2019un marteau de frappe. L\u2019acquisition peut \u00eatre r\u00e9alis\u00e9e soit avec une excitation verticale et l\u2019utilisation de g\u00e9ophones verticaux (ZVF), soit avec une excitation transversale, en utilisant des g\u00e9ophones horizontaux (THF).[\/vc_column_text][\/vc_column_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; css_animation=\u00a0\u00bbbottom-t-top\u00a0\u00bb animation_delay=\u00a0\u00bb800&Prime; toggle=\u00a0\u00bbyes\u00a0\u00bb max_height=\u00a0\u00bb450&Prime; max_height_mobile=\u00a0\u00bb60vh\u00a0\u00bb closed_txt=\u00a0\u00bbLire la suite\u00a0\u00bb btn_margin=\u00a0\u00bbsm\u00a0\u00bb open_txt=\u00a0\u00bbChiudi\u00a0\u00bb btn_align=\u00a0\u00bbleft\u00a0\u00bb width=\u00a0\u00bb1\/3&Prime; uncode_shortcode_id=\u00a0\u00bb851432&Prime;][vc_single_image media=\u00a0\u00bb108769&Prime; media_width_percent=\u00a0\u00bb100&Prime; uncode_shortcode_id=\u00a0\u00bb184206&Prime;][vc_custom_heading heading_semantic=\u00a0\u00bbh3&Prime; text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb189840&Prime;]\u00c9tude sismique HVSR[\/vc_custom_heading][vc_column_text uncode_shortcode_id=\u00a0\u00bb150654&Prime;]L\u2019\u00e9tude sismique passive HVSR permet d\u2019identifier les fr\u00e9quences caract\u00e9ristiques de r\u00e9sonance des sols. Elle est particuli\u00e8rement utilis\u00e9e dans les \u00e9tudes de microzonation sismique et pour la conception de b\u00e2timents antisismiques. De plus, la polyvalence de ce type d\u2019enqu\u00eate permet \u00e9galement de d\u00e9terminer les fr\u00e9quences de r\u00e9sonance d\u2019un b\u00e2timent, afin de les comparer \u00e0 celles du sol. La technique consiste \u00e0 enregistrer le bruit ambiant \u00e0 l\u2019aide d\u2019un tromom\u00e8tre num\u00e9rique reli\u00e9 \u00e0 un sismographe.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; css_animation=\u00a0\u00bbbottom-t-top\u00a0\u00bb animation_delay=\u00a0\u00bb300&Prime; toggle=\u00a0\u00bbyes\u00a0\u00bb max_height=\u00a0\u00bb450&Prime; max_height_mobile=\u00a0\u00bb60vh\u00a0\u00bb closed_txt=\u00a0\u00bbLire la suite\u00a0\u00bb btn_margin=\u00a0\u00bbsm\u00a0\u00bb open_txt=\u00a0\u00bbChiudi\u00a0\u00bb btn_align=\u00a0\u00bbleft\u00a0\u00bb width=\u00a0\u00bb1\/3&Prime; uncode_shortcode_id=\u00a0\u00bb105086&Prime;][vc_single_image media=\u00a0\u00bb108772&Prime; media_width_percent=\u00a0\u00bb100&Prime; uncode_shortcode_id=\u00a0\u00bb193670&Prime;][vc_custom_heading heading_semantic=\u00a0\u00bbh3&Prime; text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb665588&Prime;]Enqu\u00eate sismique Re.Mi.[\/vc_custom_heading][vc_column_text uncode_shortcode_id=\u00a0\u00bb209607&Prime;]Cette m\u00e9thode, dont le nom provient de Refraction Microtremor, utilise le m\u00eame dispositif qu\u2019une M.A.S.W. ou qu\u2019une sismique par r\u00e9fraction, avec des g\u00e9ophones \u00e0 basse fr\u00e9quence mais, au lieu d\u2019enregistrer la perturbation sismique induite par une source d\u2019\u00e9nergie, elle enregistre, pendant une p\u00e9riode comprise entre 20 et 30 secondes, les microtremblements.[\/vc_column_text][\/vc_column_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; css_animation=\u00a0\u00bbbottom-t-top\u00a0\u00bb animation_delay=\u00a0\u00bb600&Prime; width=\u00a0\u00bb1\/3&Prime; uncode_shortcode_id=\u00a0\u00bb629200&Prime;][\/vc_column_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; css_animation=\u00a0\u00bbbottom-t-top\u00a0\u00bb animation_delay=\u00a0\u00bb800&Prime; width=\u00a0\u00bb1\/3&Prime; uncode_shortcode_id=\u00a0\u00bb815608&Prime;][\/vc_column_inner][\/vc_row_inner][vc_row_inner row_inner_height_percent=\u00a0\u00bb0&Prime; overlay_alpha=\u00a0\u00bb50&Prime; gutter_size=\u00a0\u00bb3&Prime; shift_y=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; desktop_visibility=\u00a0\u00bbyes\u00a0\u00bb medium_visibility=\u00a0\u00bbyes\u00a0\u00bb mobile_visibility=\u00a0\u00bbyes\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb187308&Prime;][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; css_animation=\u00a0\u00bbbottom-t-top\u00a0\u00bb animation_delay=\u00a0\u00bb300&Prime; toggle=\u00a0\u00bbyes\u00a0\u00bb max_height=\u00a0\u00bb450&Prime; max_height_mobile=\u00a0\u00bb60vh\u00a0\u00bb closed_txt=\u00a0\u00bbLire la suite\u00a0\u00bb btn_margin=\u00a0\u00bbsm\u00a0\u00bb open_txt=\u00a0\u00bbChiudi\u00a0\u00bb btn_align=\u00a0\u00bbleft\u00a0\u00bb width=\u00a0\u00bb1\/3&Prime; uncode_shortcode_id=\u00a0\u00bb185477&Prime;][vc_single_image media=\u00a0\u00bb108772&Prime; media_width_percent=\u00a0\u00bb100&Prime; uncode_shortcode_id=\u00a0\u00bb193670&Prime;][vc_custom_heading heading_semantic=\u00a0\u00bbh3&Prime; text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb195770&Prime;]Enqu\u00eate sismique Re.Mi.[\/vc_custom_heading][vc_column_text uncode_shortcode_id=\u00a0\u00bb190018&Prime;]Cette m\u00e9thode, dont le nom provient de Refraction Microtremor, utilise le m\u00eame dispositif qu\u2019une M.A.S.W. ou qu\u2019une sismique par r\u00e9fraction, avec des g\u00e9ophones \u00e0 basse fr\u00e9quence mais, au lieu d\u2019enregistrer la perturbation sismique induite par une source d\u2019\u00e9nergie, elle enregistre, pendant une p\u00e9riode comprise entre 20 et 30 secondes, les microtremblements.[\/vc_column_text][\/vc_column_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; css_animation=\u00a0\u00bbbottom-t-top\u00a0\u00bb animation_delay=\u00a0\u00bb600&Prime; toggle=\u00a0\u00bbyes\u00a0\u00bb max_height=\u00a0\u00bb450&Prime; max_height_mobile=\u00a0\u00bb60vh\u00a0\u00bb closed_txt=\u00a0\u00bbLire la suite\u00a0\u00bb btn_margin=\u00a0\u00bbsm\u00a0\u00bb open_txt=\u00a0\u00bbChiudi\u00a0\u00bb btn_align=\u00a0\u00bbleft\u00a0\u00bb width=\u00a0\u00bb1\/3&Prime; uncode_shortcode_id=\u00a0\u00bb144590&Prime;][vc_single_image media=\u00a0\u00bb105581&Prime; media_width_percent=\u00a0\u00bb100&Prime; uncode_shortcode_id=\u00a0\u00bb908897&Prime;][vc_custom_heading heading_semantic=\u00a0\u00bbh3&Prime; text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb579491&Prime;]Prospection sismique TSP[\/vc_custom_heading][vc_column_text uncode_shortcode_id=\u00a0\u00bb152212&Prime;]L\u2019investigation sismique TSP (Tunnel Seismic Prediction) est une m\u00e9thodologie avanc\u00e9e utilis\u00e9e pour la pr\u00e9vision des conditions g\u00e9ologiques en avant du front d\u2019excavation des tunnels. Cette technique permet d\u2019obtenir des informations d\u00e9taill\u00e9es sur la structure du terrain jusqu\u2019\u00e0 plusieurs dizaines de m\u00e8tres devant le front de taille, en identifiant des discontinuit\u00e9s, des fractures, des zones de faiblesse ou la pr\u00e9sence d\u2019eau. Elle est particuli\u00e8rement utile dans les projets de g\u00e9nie civil afin d\u2019am\u00e9liorer la s\u00e9curit\u00e9 et l\u2019efficacit\u00e9 des op\u00e9rations d\u2019excavation dans des contextes complexes ou peu connus.<br \/>\nLa technique TSP repose sur l\u2019\u00e9mission et l\u2019enregistrement d\u2019ondes sismiques g\u00e9n\u00e9r\u00e9es par des sources artificielles, \u00e0 l\u2019aide de g\u00e9ophones dispos\u00e9s le long des parois du tunnel. L\u2019analyse des ondes r\u00e9fl\u00e9chies et r\u00e9fract\u00e9es permet d\u2019\u00e9laborer une image tridimensionnelle du terrain en avant du creusement, fournissant des informations essentielles pour la gestion du front de taille et pour le choix des techniques de sout\u00e8nement et de consolidation les plus appropri\u00e9es.[\/vc_column_text][\/vc_column_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; css_animation=\u00a0\u00bbbottom-t-top\u00a0\u00bb animation_delay=\u00a0\u00bb800&Prime; toggle=\u00a0\u00bbyes\u00a0\u00bb max_height=\u00a0\u00bb450&Prime; max_height_mobile=\u00a0\u00bb60vh\u00a0\u00bb closed_txt=\u00a0\u00bbLire la suite\u00a0\u00bb btn_margin=\u00a0\u00bbsm\u00a0\u00bb open_txt=\u00a0\u00bbChiudi\u00a0\u00bb btn_align=\u00a0\u00bbleft\u00a0\u00bb width=\u00a0\u00bb1\/3&Prime; uncode_shortcode_id=\u00a0\u00bb268159&Prime;][vc_single_image media=\u00a0\u00bb105582&Prime; media_width_percent=\u00a0\u00bb100&Prime; uncode_shortcode_id=\u00a0\u00bb119900&Prime;][vc_custom_heading heading_semantic=\u00a0\u00bbh3&Prime; text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb276245&Prime;]\u00c9tude sismique passive SPAC[\/vc_custom_heading][vc_column_text uncode_shortcode_id=\u00a0\u00bb115748&Prime;]L\u2019\u00e9tude sismique passive SPAC (Autocorr\u00e9lation spatiale) est une technique g\u00e9ophysique qui permet d\u2019obtenir le profil de vitesse des ondes de cisaillement (Vs) du sous-sol en exploitant les ondes de surface g\u00e9n\u00e9r\u00e9es par le bruit ambiant. Elle se r\u00e9alise en disposant des g\u00e9ophones en configuration circulaire autour d\u2019un point central et en analysant la corr\u00e9lation spatiale du signal sismique. 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