{"id":1143320,"date":"2020-06-25T02:04:05","date_gmt":"2020-06-25T01:04:05","guid":{"rendered":"https:\/\/www.pressenza.com\/?p=1143320"},"modified":"2020-07-31T23:37:12","modified_gmt":"2020-07-31T22:37:12","slug":"des-structures-inattendues-jamais-connues-auparavant-sont-decouvertes-a-linterieur-de-la-terre","status":"publish","type":"post","link":"https:\/\/www.pressenza.com\/fr\/2020\/06\/des-structures-inattendues-jamais-connues-auparavant-sont-decouvertes-a-linterieur-de-la-terre\/","title":{"rendered":"Des \u00ab\u00a0structures inattendues\u00a0\u00bb jamais connues auparavant sont d\u00e9couvertes \u00e0 l’int\u00e9rieur de la Terre"},"content":{"rendered":"

La d\u00e9couverte indique les profondeurs de l’oc\u00e9an Pacifique, entre le noyau et le manteau de la plan\u00e8te.<\/p>\n

Des scientifiques de l’universit\u00e9 du Maryland (\u00c9tats-Unis) ont d\u00e9couvert entre le noyau et le manteau de la Terre une \u00ab\u00a0vaste structure, faite de mati\u00e8re dense\u00a0\u00bb, dont l’existence n’\u00e9tait pas connue auparavant. La d\u00e9couverte a \u00e9t\u00e9 faite gr\u00e2ce \u00e0 la recherche sur le comportement des ondes sismiques. L’\u00e9quipe a utilis\u00e9 le m\u00eame algorithme que celui qui est appliqu\u00e9 pour analyser les galaxies lointaines, selon un article publi\u00e9 dans la revue Science<\/a>.<\/p>\n

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La structure d\u00e9couverte est situ\u00e9e sous les \u00eeles Marquises dans le Pacifique Sud, qui sont de type volcanique. En outre, il a \u00e9t\u00e9 d\u00e9montr\u00e9 que la structure sous ces \u00eeles hawa\u00efennes est beaucoup plus grande que ce que l’on croyait auparavant. Les chercheurs ne savent pas encore en quoi consiste cette d\u00e9couverte, mais ils affirment qu’elle \u00ab\u00a0permet de mieux comprendre les processus complexes qui ont permis \u00e0 notre plan\u00e8te d’\u00e9voluer et de changer au fil du temps\u00a0\u00bb.<\/p>\n

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\u00ab\u00a0En observant des milliers d’\u00e9chos du bord du manteau central en m\u00eame temps, au lieu de nous concentrer sur quelques-uns \u00e0 la fois, comme c’est souvent le cas, nous avons acquis une toute nouvelle perspective\u00a0\u00bb, a d\u00e9clar\u00e9 Doyeon Kim, chercheure postdoctoral au D\u00e9partement de g\u00e9ologie et auteure principale de l’article.<\/p>\n

Selon la scientifique, son \u00e9tude montre que la r\u00e9gion limite du noyau-manteau poss\u00e8de de nombreuses structures qui peuvent produire de tels \u00e9chos. Son \u00e9quipe a mesur\u00e9 le temps de parcours et l’amplitude des \u00e9chos g\u00e9n\u00e9r\u00e9s par les ondes sismiques apr\u00e8s un tremblement de terre. \u00c0 partir de ces calculs, les chercheurs ont notamment \u00e9labor\u00e9 des mod\u00e8les des propri\u00e9t\u00e9s physiques des roches cach\u00e9es sous la surface.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

La d\u00e9couverte indique les profondeurs de l’oc\u00e9an Pacifique, entre le noyau et le manteau de la plan\u00e8te. Des scientifiques de l’universit\u00e9 du Maryland (\u00c9tats-Unis) ont d\u00e9couvert entre le noyau et le manteau de la Terre une \u00ab\u00a0vaste structure, faite de…<\/p>\n","protected":false},"author":1181,"featured_media":1170207,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40,495],"tags":[6261,77824,302],"class_list":["post-1143320","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-international-fr","category-sciences-technologie","tag-decouverte","tag-ocean-pacifique","tag-science"],"yoast_head":"\nDes "structures inattendues" jamais connues auparavant sont d\u00e9couvertes \u00e0 l'int\u00e9rieur de la Terre<\/title>\n<meta name=\"description\" content=\"La d\u00e9couverte indique les profondeurs de l'oc\u00e9an Pacifique, entre le noyau et le manteau de la plan\u00e8te. 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