{"id":9429,"date":"2018-09-11T16:22:24","date_gmt":"2018-09-11T16:22:24","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9429"},"modified":"2018-09-19T15:31:08","modified_gmt":"2018-09-19T15:31:08","slug":"astrobleme-canadien-manicouagan-vu-de-espace","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/09\/11\/astrobleme-canadien-manicouagan-vu-de-espace\/","title":{"rendered":"L’astrobl\u00e8me canadien de Manicouagan vu de l’espace"},"content":{"rendered":"

Photographi\u00e9 en fausses couleurs par le satellite Sentinel-1A, le crat\u00e8re de Manicouagan s’est form\u00e9 il y a un peu plus de 200 millions d’ann\u00e9es.\u00a0<\/strong><\/p>\n

Il y a 214 millions d’ann\u00e9es, un ast\u00e9ro\u00efde est venu frapper ce qui est aujourd’hui le comt\u00e9 de Manicouagan dans la r\u00e9gion de la C\u00f4te-Nord du Qu\u00e9bec, au Canada, environ 300 km au nord de la ville de Baie-Comeau (et 10\u00b0 de latitude plus bas que le crat\u00e8re d’impact des Pingualuit<\/a>, beaucoup plus r\u00e9cent). Il s’agit d’un des\u00a0crat\u00e8res d’impact les plus anciens et les plus importants de la plan\u00e8te.\u00a0Partiellement d\u00e9truit par l’\u00e9rosion caus\u00e9e par les glaciers, il n’est pas facilement d\u00e9celable sur le terrain, d’o\u00f9 son classement dans la famille des astrobl\u00e8mes (tout comme Rochechouart<\/a> en France).<\/p>\n

\"\"<\/a><\/p>\n

Sa structure concentrique r\u00e9sulte des ondes de choc transmises par l’impact. Ceux-ci ressemblent un peu aux anneaux qui se forment quand un caillou est tomb\u00e9 dans l’eau.<\/p>\n

Form\u00e9 par l’impact d’une m\u00e9t\u00e9orite d’environ 5 km de diam\u00e8tre, le crat\u00e8re peut facilement \u00eatre observ\u00e9 depuis l’espace. La structure \u00e0 plusieurs anneaux a un diam\u00e8tre d’environ 100 km et l’anneau int\u00e9rieur 70 km. Cette image a \u00e9t\u00e9 obtenue par balayage radar depuis le satellite Sentinel-1A<\/a>\u00a0(image ESA<\/a>). Les couleurs artificielles traduisent la diversit\u00e9 des terrains : alors que les tons bleus repr\u00e9sentent des masses de glace et d’eau, les tons jaunes et orang\u00e9s trahissent l’existence d’une v\u00e9g\u00e9tation vieillissante vari\u00e9e m\u00e9lang\u00e9e \u00e0 des plaques de neige et de glace. Le\u00a0crat\u00e8re a \u00e9t\u00e9 inond\u00e9 dans les ann\u00e9es 1970 \u00e0 la suite de la construction du barrage Daniel-Johnson : le r\u00e9servoir est repr\u00e9sent\u00e9 par l’anneau bleu \u00e0 droite de l’image, le centre du crat\u00e8re \u00e9tant occup\u00e9 par l’\u00eele Ren\u00e9-Levasseur.<\/p>\n

Install\u00e9 sur une orbite polaire depuis le mois d’avril 2014, le satellite Sentinel-1A est charg\u00e9 d’une mission d’imagerie radar tous temps, de jour comme de nuit, pour les services terrestres et oc\u00e9aniques.<\/p>\n","protected":false},"excerpt":{"rendered":"

Photographi\u00e9 en fausses couleurs par le satellite Sentinel-1A, le crat\u00e8re de Manicouagan s’est form\u00e9 il y a un peu plus de 200 millions d’ann\u00e9es.\u00a0 Il y a 214 millions d’ann\u00e9es, un ast\u00e9ro\u00efde est venu frapper ce qui est aujourd’hui le comt\u00e9 de Manicouagan dans la r\u00e9gion de la C\u00f4te-Nord du Qu\u00e9bec, au Canada, environ 300 … Continuer la lecture de L’astrobl\u00e8me canadien de Manicouagan vu de l’espace<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9430,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[2541,1002,2540,1630,2542],"class_list":["post-9429","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-astrobleme","tag-canada","tag-manicouagan","tag-quebec","tag-sentinel-1a"],"yoast_head":"\nL'astrobl\u00e8me canadien de Manicouagan vu de l'espace<\/title>\n<meta name=\"description\" content=\"Photographi\u00e9 en fausses couleurs par le satellite Sentinel-1A, le crat\u00e8re de Manicouagan s'est form\u00e9 il y a un peu plus de 200 millions d'ann\u00e9es.\u00a0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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