{"id":20847,"date":"2023-10-27T15:37:40","date_gmt":"2023-10-27T15:37:40","guid":{"rendered":"https:\/\/www.africa-press.net\/madagascar\/politique\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee"},"modified":"2023-10-27T17:20:48","modified_gmt":"2023-10-27T17:20:48","slug":"mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee","title":{"rendered":"Mars\u00a0: l\u2019origine du plus puissant s\u00e9isme enregistr\u00e9 d\u00e9voil\u00e9e"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Madagascar. <\/strong><\/span><b>Qu\u2019est-ce qui a provoque\u0301, sur Mars, le se\u0301isme de magnitude 4,7 enregistre\u0301 l\u2019anne\u0301e dernie\u0300re par la sonde ame\u0301ricaine InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) \u2013 le plus puissant jamais de\u0301tecte\u0301 sur la plane\u0300te Rouge qui a secoue\u0301 celle-ci pendant plus de six heures ?<\/b><\/p>\n<p>Pour le savoir, des investigations d\u2019une ampleur ine\u0301dite impliquant l\u2019ensemble des missions martiennes en orbite ont e\u0301te\u0301 mises en \u0153uvre. Elles ont permis d\u2019e\u0301carter la re\u0301ponse qui e\u0301tait jusqu\u2019a\u0300 pre\u0301sent privile\u0301gie\u0301e, conclue une e\u0301tude dont le premier auteur est le ge\u0301ophysicien Benjamin Fernando, de l\u2019universite\u0301 d\u2019Oxford au Royaume-Uni, a\u0300 laquelle plusieurs chercheurs franc\u0327ais ont participe\u0301. Des travaux qui indiquent, e\u0301galement, que \u201cl\u2019activite\u0301 sismique de la plane\u0300te est bien plus importante que ce qu\u2019on pensait\u201d, pointe un communique\u0301 de l\u2019universite\u0301 d\u2019Oxford.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"277\" class=\"alignnone wp-image-20843 size-full\" src=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410902.475383.jpg\" srcset=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410902.475383.jpg 453w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410902.475383-300x183.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Me\u0301te\u0301orites de plusieurs centaines de tonnes<\/b><\/p>\n<p>Note\u0301 \u201cS1222a\u201d, le se\u0301isme s\u2019est produit le 4 mai 2022. Parmi les 1300 tremblements de Mars capte\u0301s depuis 2018 par InSight et son sismome\u0300tre SEIS conc\u0327u par l\u2019Institut de physique du globe de Paris, c\u2019est sans conteste le plus violent \u2013 le fameux \u201cBig One\u201d que les plane\u0301tologues attendaient depuis des anne\u0301es et qui permettra, gra\u0302ce a\u0300 d\u2019autres e\u0301ve\u0300nements sismiques et des analyses de\u0301taille\u0301es, de de\u0301voiler de nouvelles informations sur les profondeurs de notre voisine. Or les signatures sismiques de S1222a ressemblaient a\u0300 celles qu\u2019avaient cause\u0301es des chutes de grosses me\u0301te\u0301orites, de plusieurs centaines de tonnes, tombe\u0301es en 2021 sur Mars et de\u0301tecte\u0301es par InSight.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"338\" class=\"alignnone wp-image-20844 size-full\" src=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410912.195745.jpg\" srcset=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410912.195745.jpg 453w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410912.195745-300x224.jpg 300w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410912.195745-80x60.jpg 80w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>A la recherche de preuves<\/b><\/p>\n<p>Pour le confirmer, il fallait en retrouver les traces : traverse\u0301e dans l\u2019atmosphe\u0300re martienne, projection de poussie\u0300res et de\u0301bris sur une zone de plus de 150 kilome\u0300tres de large vue la magnitude du se\u0301isme, et, bien su\u0302r, le crate\u0300re d\u2019impact, qui selon les estimations devrait mesurer environ 300 me\u0300tres de diame\u0300tre. L\u2019enque\u0302te a mobilise\u0301 une douzaine de capteurs embarque\u0301s sur la flotte des orbiteurs martiens, ope\u0301re\u0301s par les agences spatiales ame\u0301ricaine, europe\u0301enne, indienne, chinoise et e\u0301miratie. C\u2019est \u201cla premie\u0300re fois que l\u2019ensemble des missions en orbite autour de Mars ont collabore\u0301 ensemble sur un me\u0302me projet\u201d, signale le communique\u0301 de l\u2019universite\u0301 d\u2019Oxford ! Mais apre\u0300s des mois de recherches et d\u2019analyses photographiques, pas la moindre empreinte n\u2019a pu e\u0302tre de\u0301niche\u0301e.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"399\" class=\"alignnone wp-image-20845 size-full\" src=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410919.565141.jpg\" srcset=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410919.565141.jpg 453w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410919.565141-300x264.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Une origine ne\u0301cessairement endoge\u0300ne<\/b><\/p>\n<p>Ce violent se\u0301isme aurait par conse\u0301quent une origine endoge\u0300ne, lie\u0301e au brusque rela\u0302chement de contraintes me\u0301caniques accumule\u0301es dans la crou\u0302te de Mars. \u201cNous restons convaincus que Mars ne posse\u0300de pas de tectonique des plaques active actuellement \u2013 donc cet e\u0301ve\u0300nement a e\u0301te\u0301 probablement engendre\u0301 par la libe\u0301ration d\u2019un stress au sein de la crou\u0302te martienne, pre\u0301cise Benjamin Fernando. Ces stress sont le re\u0301sultat de milliards d\u2019anne\u0301es d\u2019e\u0301volution, notamment le refroidissement et la contraction de diffe\u0301rentes re\u0301gions de la plane\u0300te a\u0300 des taux diffe\u0301rents. Nous ne comprenons pas encore bien pourquoi certaines parties de la plane\u0300te ont accumule\u0301 plus de stress que d\u2019autres, mais des re\u0301sultats comme celui-ci nous aideront a\u0300 progresser. Un jour, de telles informations nous aideront aussi a\u0300 comprendre ou\u0300 il serait moins risque\u0301 pour les humains de vivre sur Mars et les endroits qu\u2019il faudrait au contraire e\u0301viter.\u201d<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/madagascar\">Madagascar<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Madagascar. Qu\u2019est-ce qui a provoque\u0301, sur Mars, le se\u0301isme de magnitude 4,7 enregistre\u0301 l\u2019anne\u0301e dernie\u0300re par la sonde ame\u0301ricaine InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) \u2013 le plus puissant jamais de\u0301tecte\u0301 sur la plane\u0300te Rouge qui a secoue\u0301 celle-ci pendant plus de six heures ? Pour le savoir, des [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":20846,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,50,49],"class_list":["post-20847","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-madagascar","tag-madagascar"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Mars\u00a0: l\u2019origine du plus puissant s\u00e9isme enregistr\u00e9 d\u00e9voil\u00e9e - Madagascar<\/title>\n<meta name=\"description\" content=\"Qu\u2019est-ce qui a provoque\u0301, sur Mars, le se\u0301isme de magnitude 4,7 enregistre\u0301 l\u2019anne\u0301e dernie\u0300re par la sonde ame\u0301rica ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mars\u00a0: l\u2019origine du plus puissant s\u00e9isme enregistr\u00e9 d\u00e9voil\u00e9e\" \/>\n<meta property=\"og:description\" content=\"Qu\u2019est-ce qui a provoque\u0301, sur Mars, le se\u0301isme de magnitude 4,7 enregistre\u0301 l\u2019anne\u0301e dernie\u0300re par la sonde ame\u0301rica ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee\" \/>\n<meta property=\"og:site_name\" content=\"Madagascar\" \/>\n<meta property=\"article:published_time\" content=\"2023-10-27T15:37:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-10-27T17:20:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410928.220665.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"901\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Mars\u00a0: l\u2019origine du plus puissant s\u00e9isme enregistr\u00e9 d\u00e9voil\u00e9e\",\"datePublished\":\"2023-10-27T15:37:40+00:00\",\"dateModified\":\"2023-10-27T17:20:48+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee\"},\"wordCount\":644,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1698410928.220665.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Madagascar\",\"Madagascar\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee\",\"url\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/mars-lorigine-du-plus-puissant-seisme-enregistre-devoilee\",\"name\":\"Mars\u00a0: l\u2019origine du plus puissant s\u00e9isme enregistr\u00e9 d\u00e9voil\u00e9e - 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