{"id":2162,"date":"2024-02-25T10:54:00","date_gmt":"2024-02-25T09:54:00","guid":{"rendered":"https:\/\/svt-dalaine.fr\/svt\/?page_id=2162"},"modified":"2025-03-06T08:37:44","modified_gmt":"2025-03-06T07:37:44","slug":"st-d-2-les-seismes-origine-et-consequences","status":"publish","type":"page","link":"https:\/\/svt-dalaine.fr\/svt\/st-d-2-les-seismes-origine-et-consequences\/","title":{"rendered":"ST-D-2 Les s\u00e9ismes, origine et cons\u00e9quences"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2162\" class=\"elementor elementor-2162\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4628c45 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4628c45\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a01ecae\" data-id=\"a01ecae\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2f4bcdc elementor-widget elementor-widget-image\" data-id=\"2f4bcdc\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"640\" height=\"427\" src=\"https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2024\/02\/IMG_1021-1024x683.jpg\" class=\"attachment-large size-large wp-image-2166\" alt=\"\" srcset=\"https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2024\/02\/IMG_1021-1024x683.jpg 1024w, https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2024\/02\/IMG_1021-300x200.jpg 300w, https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2024\/02\/IMG_1021-768x512.jpg 768w, https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2024\/02\/IMG_1021-1536x1024.jpg 1536w, https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2024\/02\/IMG_1021-2048x1365.jpg 2048w, https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2024\/02\/IMG_1021-360x240.jpg 360w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1764873 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1764873\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-996e751\" data-id=\"996e751\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9e421e0 elementor-widget elementor-widget-text-editor\" data-id=\"9e421e0\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Extrait du B.O.<\/p><p>L\u2019\u00e9tude des s\u00e9ismes et l\u2019\u00e9valuation des al\u00e9as sismiques passent par la description des \u00e9v\u00e9nements et par des mesures et des calculs (magnitude, m\u00e9canismes au foyer, d\u00e9placement par GPS&#8230;).<\/p><p>La relaxation rapide d\u2019\u00e9nergie accumul\u00e9e par les d\u00e9formations \u00e9lastiques, mesurables par g\u00e9od\u00e9sie spatiale, est responsable de la formation des s\u00e9ismes.<\/p><p>La notion (historique) de cycle sismique rassemble l&#8217;accumulation de d\u00e9formation \u00e9lastique et le rebond sismique.<\/p><p>Pour un s\u00e9isme donn\u00e9, le m\u00e9canisme au foyer permet l\u2019analyse de la g\u00e9om\u00e9trie de la faille et de son mouvement. L\u2019\u00e9tude d\u2019un ensemble de m\u00e9canismes au foyer dans une r\u00e9gion donn\u00e9e permet de<\/p><p>caract\u00e9riser et mod\u00e9liser le contexte tectonique.<\/p><p>La distribution mondiale des s\u00e9ismes et la variabilit\u00e9 des m\u00e9canismes au foyer renseigne sur la g\u00e9odynamique globale et sur les fronti\u00e8res de<\/p><p>plaques.<\/p><p>Les mesures de g\u00e9od\u00e9sie spatiale par GPS permettent d\u2018\u00e9valuer les d\u00e9placements instantan\u00e9s, de les comparer \u00e0 ceux d\u00e9termin\u00e9s \u00e0 l\u2019\u00e9chelle des fronti\u00e8res de plaque (en termes de bilan de d\u00e9formation) et de pr\u00e9ciser la connaissance de l\u2019al\u00e9a localement.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Extrait du B.O. L\u2019\u00e9tude des s\u00e9ismes et l\u2019\u00e9valuation des al\u00e9as sismiques passent par la description des \u00e9v\u00e9nements et par des mesures et des calculs (magnitude, m\u00e9canismes au foyer, d\u00e9placement par GPS&#8230;). La relaxation rapide d\u2019\u00e9nergie accumul\u00e9e par les d\u00e9formations \u00e9lastiques,&hellip;&nbsp;<a href=\"https:\/\/svt-dalaine.fr\/svt\/st-d-2-les-seismes-origine-et-consequences\/\" class=\"more-link\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2162","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ST-D-2 Les s\u00e9ismes, origine et cons\u00e9quences - Bienvenue sur le site de Sciences de la Vie et de la Terre<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/svt-dalaine.fr\/svt\/st-d-2-les-seismes-origine-et-consequences\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ST-D-2 Les s\u00e9ismes, origine et cons\u00e9quences - Bienvenue sur le site de Sciences de la Vie et de la Terre\" \/>\n<meta property=\"og:description\" content=\"Extrait du B.O. L\u2019\u00e9tude des s\u00e9ismes et l\u2019\u00e9valuation des al\u00e9as sismiques passent par la description des \u00e9v\u00e9nements et par des mesures et des calculs (magnitude, m\u00e9canismes au foyer, d\u00e9placement par GPS&#8230;). 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