{"id":16119,"date":"2017-12-21T20:00:13","date_gmt":"2017-12-21T19:00:13","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=16119"},"modified":"2017-12-13T19:43:22","modified_gmt":"2017-12-13T18:43:22","slug":"les-super-volcans-sont-bien-plus-dangereux-que-prevu","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/les-super-volcans-sont-bien-plus-dangereux-que-prevu\/","title":{"rendered":"Les super-volcans sont bien plus dangereux que pr\u00e9vu"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>Des chercheurs de la prestigieuse universit\u00e9 d\u2019Oxford ont conduit une \u00e9tude consacr\u00e9e aux \u00ab super-volcans \u00bb, et notamment le laps de temps moyen qui s\u00e9pare les r\u00e9veils explosifs de ces g\u00e9ants endormis. Mauvaise nouvelle : les super-\u00e9ruptions sont beaucoup plus proches qu\u2019on ne le pensait. Si proches qu\u2019elles pourraient m\u00eame nous rayer d\u00e9finitivement de la carte\u2026<\/p>\n<p>DES TONNES PAR MILLIARDS<br \/>\nLes \u00ab super-volcans \u00bb, comme leur subtile appellation le laisse entendre, sont des volcans mais beaucoup, beaucoup, beaucoup plus puissants que l\u2019Etna ou le Python de la Fournaise et compagnie. Pour vous donner un ordre d\u2019id\u00e9e, l\u2019\u00e9ruption d\u2019un de ces colosses endormis peut expulser jusqu\u2019\u00e0 1 000 giga tonnes de cendres et de roche volcaniques dans l\u2019atmosph\u00e8re \u2013 1 000 milliards de tonnes soit environ 143 milliards d\u2019\u00e9l\u00e9phants. De quoi recouvrir tout un continent, obscurcir notre ciel azur, condamner nos v\u00e9g\u00e9taux \u00e0 une mort certaine, et provoquer de gigantesques baisses de temp\u00e9ratures pour plusieurs dizaines d\u2019ann\u00e9es.<\/p>\n<p>\u00ab D\u2019une certaine fa\u00e7on, nous avons eu de la chance de ne pas avoir connu de super \u00e9ruption depuis. Mais cela ne veut pas dire pour autant que la prochaine super \u00e9ruption est en retard. La nature n\u2019est pas si r\u00e9guli\u00e8re. \u00bb<\/p>\n<p>Dieu merci, ces \u00e9pisodes cataclysmiques ne surviennent que tr\u00e8s rarement, s\u00e9par\u00e9s les uns des autres par plusieurs dizaines \u00e0 plusieurs centaines de milliers d\u2019ann\u00e9es ! On pourrait donc croire qu\u2019on est relativement saufs, d\u2019autant que les films Hollywoodiens nous ont appris que la menace venait toujours du ciel \u2013 Armageddon, Independence Day, Le Jour d\u2019apr\u00e8s. Il y a bien une poign\u00e9e de t\u00e9l\u00e9films qui ont essay\u00e9 de nous mettre la puce \u00e0 l\u2019oreille sur la menace croissante des volcans; des chefs-d\u2019oeuvre tels que Supervolcano, Miami Magma, ou Le Dernier volcan. Mais allez savoir pourquoi, personne ne les a pris au s\u00e9rieux\u2026<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/S1Kbym7WYzs?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=fr-FR&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p>Les chercheurs de l\u2019Universit\u00e9 d\u2019Oxford ont r\u00e9alis\u00e9 une analyse statistique \u00e0 partir de donn\u00e9es g\u00e9ologiques retra\u00e7ant l\u2019histoire des super-\u00e9ruptions lors des 100 000 derni\u00e8res ann\u00e9es. Publi\u00e9e dans la revue Earth and Planetary Science Letters, elle se concentre exclusivement sur les p\u00e9riodes de latence entre deux super-\u00e9ruptions. Jonathan Rougier, principal auteur de l\u2019\u00e9tude et professeur de sciences statistiques \u00e0 Oxford, rappelle qu\u2019en 2004, la communaut\u00e9 scientifique estimait qu\u2019une super-\u00e9ruption survenait tous les 45 000 \u00e0 714 000 ans.<\/p>\n<p>\u00ab Nous avons r\u00e9\u00e9valu\u00e9 cet intervalle que nous situons d\u00e9sormais entre 5.000 et 48.000 ans, la fr\u00e9quence la plus probable \u00e9tant de 17.000 ans. \u00bb<\/p>\n<p>Les conclusions des scientifiques d\u2019Oxford r\u00e9duisent consid\u00e9rablement l\u2019\u00e9cart : il passe de plusieurs centaines de milliers d\u2019ann\u00e9es \u00e0 \u00ab seulement \u00bb quelques dizaines ! Sur le papier, aucune raison de s\u2019inqui\u00e9ter : personne ne vivra aussi longtemps pour en subir les cons\u00e9quences; et si notre esp\u00e8ce survit jusque-l\u00e0, elle aura t\u00f4t fait de quitter la Terre\u2026 Le professeur Rougier reste cependant persuad\u00e9 que ces chiffres \u00ab indiquent que les volcans repr\u00e9sentent pour notre civilisation humaine un risque plus grand qu\u2019on ne le pensait \u00bb. Pas de raison de paniquer toutefois : si ces \u00e9pisodes sont plus fr\u00e9quents que les scientifiques l\u2019imaginaient, ils demeurent excessivement rares \u2013 pourvu que \u00e7a dure !<\/p>\n<p>source : <a href=\"https:\/\/dailygeekshow.com\/super-volcan-super-eruption-fin-humanite\/\" target=\"_blank\" rel=\"noopener\">https:\/\/dailygeekshow.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"16119\">(1119)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Des chercheurs de la prestigieuse universit\u00e9 d\u2019Oxford ont conduit une \u00e9tude consacr\u00e9e aux \u00ab super-volcans \u00bb, et notamment le laps&#8230;<\/p>\n","protected":false},"author":1,"featured_media":16120,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Les super-volcans sont bien plus dangereux que pr\u00e9vu @laterredufutur","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[22],"tags":[376,671,6571,233,5574,106,48,598,6572],"class_list":["post-16119","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-espace","tag-cendre","tag-explosion","tag-frequence","tag-histoire","tag-super-eruption","tag-toba","tag-volcan","tag-volcanisme","tag-yellwstone","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/12\/super-eruption-volcanique.jpg?fit=940%2C545&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-4bZ","jetpack-related-posts":[{"id":15969,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-super-volcan-du-yellowstone-en-bref\/","url_meta":{"origin":16119,"position":0},"title":"Le super-volcan du Yellowstone en bref","author":"Admin","date":"21 octobre 2017","format":false,"excerpt":"Le super-volcan du parc am\u00e9ricain du Yellowstone pourrait se r\u00e9veiller un peu plus t\u00f4t que pr\u00e9vu et plonger la Terre dans un hiver de plusieurs mois. Mais ceci n'a rien d'alarmant car il faut r\u00e9ellement lire la nature r\u00e9elle de cette \u00e9tude dans les termes suivants : Les scientifiques ont\u2026","rel":"","context":"Dans &quot;Seismes\/Volcans&quot;","block_context":{"text":"Seismes\/Volcans","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/seismes-et-volcans\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/yellowstone.jpg?fit=700%2C371&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/yellowstone.jpg?fit=700%2C371&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/yellowstone.jpg?fit=700%2C371&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/yellowstone.jpg?fit=700%2C371&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":2768,"url":"https:\/\/www.laterredufutur.com\/accueil\/lindonesie-sous-la-menace-dun-super-volcan\/","url_meta":{"origin":16119,"position":1},"title":"L&rsquo;Indon\u00e9sie sous la menace d&rsquo;un super volcan","author":"Admin","date":"4 avril 2005","format":false,"excerpt":"Un scientifique australien a mis en garde vendredi contre la menace d'un puissant volcan en Indon\u00e9sie, dont l'\u00e9ruption pourrait faire des millions de victimes, alors que le pays vient de subir deux violents s\u00e9ismes en trois mois. Le professeur Ray Cas du d\u00e9partement de g\u00e9oscience de l'universit\u00e9 Monash a indiqu\u00e9\u2026","rel":"","context":"Dans &quot;Seismes\/Volcans&quot;","block_context":{"text":"Seismes\/Volcans","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/seismes-et-volcans\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/Sumatramapcopy.jpg?fit=537%2C502&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/Sumatramapcopy.jpg?fit=537%2C502&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/Sumatramapcopy.jpg?fit=537%2C502&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":25062,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-volcan-peruvien-ubinas-est-proche-dune-eruption\/","url_meta":{"origin":16119,"position":2},"title":"Le volcan p\u00e9ruvien Ubinas est proche d&rsquo;une \u00e9ruption","author":"Admin","date":"5 juillet 2023","format":false,"excerpt":"L'Ubinas, qui culmine \u00e0 5.672 m\u00e8tres d'altitude dans le sud du pays, est entr\u00e9 dans un processus \u00e9ruptif, le premier depuis quatre ans, et mardi \"deux explosions ont \u00e9t\u00e9 enregistr\u00e9es avec des \u00e9missions de cendres qui ont atteint une hauteur maximale de 5.500 m\u00e8tres au-dessus du sommet du crat\u00e8re\", a\u2026","rel":"","context":"Dans &quot;Seismes\/Volcans&quot;","block_context":{"text":"Seismes\/Volcans","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/seismes-et-volcans\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/volcan-ubinas-perou.jpg?fit=624%2C468&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/volcan-ubinas-perou.jpg?fit=624%2C468&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/volcan-ubinas-perou.jpg?fit=624%2C468&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":2681,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-volcan-exterminateur-va-se-reveiller\/","url_meta":{"origin":16119,"position":3},"title":"Un Volcan exterminateur va se r\u00e9veiller","author":"Admin","date":"3 f\u00e9vrier 2005","format":false,"excerpt":"Le Parc du Yellowstone vu de l'espace. La d\u00e9pression sombre qui occupe tout le centre de l'image est le crat\u00e8re d'un volcan monstrueux. Il n'y a pas que les impacts d'ast\u00e9ro\u00efdes qui peuvent provoquer des extinctions de masse, comme celle qui a emport\u00e9 les dinosaures. Les chercheurs savent depuis longtemps\u2026","rel":"","context":"Dans &quot;Seismes\/Volcans&quot;","block_context":{"text":"Seismes\/Volcans","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/seismes-et-volcans\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/yellowstone.gif?fit=410%2C281&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":7765,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-caldeira-de-campi-flegrei-a-naples\/","url_meta":{"origin":16119,"position":4},"title":"La caldeira de Campi Flegrei \u00e0 Naples","author":"Admin","date":"10 ao\u00fbt 2015","format":false,"excerpt":"Il y a deux mille ans, le V\u00e9suve d\u00e9truisit Pomp\u00e9i. Aujourd'hui, un plus grand danger se cache dans la baie de Naples , un super-volcan ! bien plus mortel !. Si ce super-volcan Campi Flegrei entre en \u00e9ruption, il pourrait cr\u00e9er un d\u00e9sastre en Europe. C'est pourquoi des scientifiques britanniques\u2026","rel":"","context":"Dans &quot;Seismes\/Volcans&quot;","block_context":{"text":"Seismes\/Volcans","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/seismes-et-volcans\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/08\/campi_flegrei.jpg?fit=600%2C350&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/08\/campi_flegrei.jpg?fit=600%2C350&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/08\/campi_flegrei.jpg?fit=600%2C350&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":1702,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-caldera-du-yellowstone\/","url_meta":{"origin":16119,"position":5},"title":"La Caldeira du Yellowstone","author":"Admin","date":"17 d\u00e9cembre 2013","format":false,"excerpt":"Il n'y a pas que les impacts d'ast\u00e9ro\u00efdes qui peuvent provoquer des extinctions de masse, comme celle qui a emport\u00e9 les dinosaures. Les chercheurs savent depuis longtemps que certaines sont associ\u00e9es \u00e0 des \u00e9pisodes de volcanisme tr\u00e8s intense. Mais on ne comprenait pas bien comment ces \u00e9ruptions \u00e0 grande \u00e9chelle\u2026","rel":"","context":"Dans &quot;Seismes\/Volcans&quot;","block_context":{"text":"Seismes\/Volcans","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/seismes-et-volcans\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/chambre-magmatique-yellowstone.png?fit=600%2C332&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/chambre-magmatique-yellowstone.png?fit=600%2C332&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/chambre-magmatique-yellowstone.png?fit=600%2C332&ssl=1&resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/16119","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=16119"}],"version-history":[{"count":2,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/16119\/revisions"}],"predecessor-version":[{"id":16122,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/16119\/revisions\/16122"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/16120"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=16119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=16119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=16119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}