{"id":9210,"date":"2015-11-18T00:00:42","date_gmt":"2015-11-17T23:00:42","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=9210"},"modified":"2015-11-09T19:53:31","modified_gmt":"2015-11-09T18:53:31","slug":"decouverte-de-2-chambres-magmatiques-sur-le-mont-saint-helens","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-de-2-chambres-magmatiques-sur-le-mont-saint-helens\/","title":{"rendered":"D\u00e9couverte de 2 chambres magmatiques sur le mont Saint Helens"},"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 style=\"text-align: justify;\">Lentement mais s\u00fbrement, les volcans livrent leurs secrets. On vient ainsi de r\u00e9aliser une tomographie sismique sous le c\u00e9l\u00e8bre mont Saint Helens. Elle a r\u00e9v\u00e9l\u00e9 l\u2019existence de deux chambres magmatiques et sugg\u00e9r\u00e9 l\u2019existence d\u2019une connexion entre elles qui serait peut-\u00eatre \u00e0 l\u2019origine de la fameuse \u00e9ruption du 18 mai 1980.<\/p>\n<p><iframe loading=\"lazy\" title=\"La Minute de v\u00e9rit\u00e9 - S02 E04 - L&#039;\u00e9ruption Du Mont Saint Helens\" frameborder=\"0\" width=\"500\" height=\"284\" src=\"https:\/\/geo.dailymotion.com\/player.html?video=x13ef0v&#038;\" allowfullscreen allow=\"autoplay; fullscreen; picture-in-picture; web-share\"><\/iframe><\/p>\n<p style=\"text-align: justify;\">Le 18 mai 1980 apr\u00e8s 123 ans de sommeil, le mont Saint Helens allait faire une entr\u00e9e tonitruante dans le monde de l\u2019histoire de la volcanologie en se mettant en \u00e9ruption avec une puissance \u00e9quivalente \u00e0 au moins 10.000 bombes d\u2019Hiroshima. Il allait ainsi perdre 400 m de hauteur et environ un tiers de son volume en quelques minutes. Depuis lors, ce stratovolcan de la cha\u00eene des Cascades, dans l\u2019\u00e9tat de Washington aux \u00c9tats-Unis, a \u00e9t\u00e9 l\u2019un des plus \u00e9tudi\u00e9s au monde. L\u2019activit\u00e9 volcanique du Saint Helens juste avant cette \u00e9ruption n\u2019avait d\u2019ailleurs pas manqu\u00e9 d\u2019attirer de c\u00e9l\u00e8bres volcanologues comme Maurice et Katia Krafft, mais aussi Haroun Tazieff.<\/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><iframe loading=\"lazy\" title=\"Interview : 3 \u00e9ruptions volcaniques majeures ayant marqu\u00e9 l\u2019histoire\" frameborder=\"0\" width=\"500\" height=\"281\" src=\"https:\/\/geo.dailymotion.com\/player.html?video=x36zjx1&#038;\" allowfullscreen allow=\"autoplay; fullscreen; picture-in-picture; web-share\"><\/iframe><\/p>\n<p style=\"text-align: justify;\">Aujourd\u2019hui, le mont Saint Helens est plus calme, mais les g\u00e9ophysiciens et les g\u00e9ochimistes continuent d\u2019\u00e9tudier ses entrailles, les premiers par des m\u00e9thodes \u00e9lectriques, magn\u00e9tiques et bien s\u00fbr sismiques et les seconds en investiguant les gaz et la composition des laves et des cendres. Or justement, on commence \u00e0 avoir les premiers r\u00e9sultats d\u2019une campagne de mesures lanc\u00e9e en 2014 dans le cadre du projet imaging Magma Under Saint Helens (iMUSH). Il s\u2019agissait notamment d\u2019illuminer le sous-sol sous le volcan \u00e0 l\u2019aide des ondes sismiques produites par 23 explosions de forte puissance. Les signaux r\u00e9sultants ont ensuite \u00e9t\u00e9 enregistr\u00e9s par environ 2.500 sismom\u00e8tres install\u00e9s autour de l\u2019\u00e9difice volcanique.<\/p>\n<p><a href=\"http:\/\/www.laterredufutur.com\/accueil\/\" target=\"_blank\">TDF<\/a><\/p>\n<p>extrait et source de <a href=\"http:\/\/www.futura-sciences.com\/\" target=\"_blank\">http:\/\/www.futura-sciences.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"9210\">(1148)<\/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>Lentement mais s\u00fbrement, les volcans livrent leurs secrets. On vient ainsi de r\u00e9aliser une tomographie sismique sous le c\u00e9l\u00e8bre mont&#8230;<\/p>\n","protected":false},"author":1,"featured_media":9211,"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_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":"D\u00e9couverte de 2 #chambres magmatiques sur le #mont Saint Helens @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},"jetpack_post_was_ever_published":false},"categories":[19],"tags":[5025,374,5026,5024,1513,259,684,48,454],"class_list":["post-9210","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seismes-et-volcans","tag-chambres-magmatiques","tag-eruption","tag-lars","tag-mont-saint-helens","tag-sismique","tag-usa","tag-video","tag-volcan","tag-volcanique","wpcat-19-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/11\/Mount_St_Helens.jpg?fit=624%2C352&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-2oy","jetpack-related-posts":[{"id":18127,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-dome-du-mont-st-helens-seleve-de-5-metres-par-jour\/","url_meta":{"origin":9210,"position":0},"title":"Le d\u00f4me du mont St Helens s&rsquo;\u00e9l\u00e8ve de 5 m\u00e8tres par jour","author":"Admin","date":"28 janvier 2019","format":false,"excerpt":"Le Mont Saint Helens pourrait \u00e0 nouveau entrer en \u00e9ruption alors que les scientifiques surveillent de pr\u00e8s un d\u00f4me de lave s'\u00e9levant de cinq m\u00e8tres par jour. Un scientifique de l'USGS ajoute: \u00ab Ce qui est vraiment ph\u00e9nom\u00e9nal, c'est la quantit\u00e9 de roche qui sort encore du sol. Il est\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\/2019\/01\/mont-st-helens.jpg?fit=1024%2C576&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/mont-st-helens.jpg?fit=1024%2C576&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/mont-st-helens.jpg?fit=1024%2C576&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/mont-st-helens.jpg?fit=1024%2C576&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":12152,"url":"https:\/\/www.laterredufutur.com\/accueil\/il-y-a-36-ans-le-mont-st-helens-explosait-et-aujourdhui-que-se-passe-t-il\/","url_meta":{"origin":9210,"position":1},"title":"Il y a 36 ans, le Mont St Helens explosait et aujourd&rsquo;hui que se passe t-il ?","author":"Admin","date":"9 mai 2016","format":false,"excerpt":"En 1980, survenait dans l\u2019ouest des Etats-Unis l\u2019une des \u00e9ruptions les plus violentes de ces derniers mill\u00e9naires. Le Mont St Helens \u00e9tait en activit\u00e9 depuis quelques semaines lorsque, le 18 mai 1980 au matin, toute la partie sommitale explosa, changeant l\u2019aspect du volcan et de la r\u00e9gion pour les ann\u00e9es\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\/05\/mt_st_Helens.jpg?fit=973%2C608&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/mt_st_Helens.jpg?fit=973%2C608&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/mt_st_Helens.jpg?fit=973%2C608&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/mt_st_Helens.jpg?fit=973%2C608&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":6696,"url":"https:\/\/www.laterredufutur.com\/accueil\/eruption-du-mont-st-helens-le-18-mai-1980\/","url_meta":{"origin":9210,"position":2},"title":"Eruption du Mont St. Helens, le 18 mai 1980","author":"Admin","date":"19 mai 2015","format":false,"excerpt":"A 15h45, le 18 mai 1980, GOES-3 a pris cette image visible du Pacifique Nord-Ouest montrant l'\u00e9ruption massive du mont St. Helens dans la partie ouest de la cha\u00eene des Cascades. Un grand panache pyroclastique de fum\u00e9es et de cendres peut \u00eatre vu dans le centre de l'image qui 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\/05\/mont-st-helen-18-mai-1980.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/mont-st-helen-18-mai-1980.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/mont-st-helen-18-mai-1980.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/mont-st-helen-18-mai-1980.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/mont-st-helen-18-mai-1980.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":11105,"url":"https:\/\/www.laterredufutur.com\/accueil\/coree-du-nord-un-des-volcans-les-plus-dangereux-au-monde-pourrait-entrer-en-eruption-si-un-nouvel-essai-nucleaire-se-produisait\/","url_meta":{"origin":9210,"position":3},"title":"Cor\u00e9e du Nord: un des volcans les plus dangereux au monde pourrait entrer en \u00e9ruption si un nouvel essai nucl\u00e9aire se produisait !","author":"Admin","date":"21 f\u00e9vrier 2016","format":false,"excerpt":"Les sismologues alertent sur le danger de nouveaux essais nucl\u00e9aires nord-cor\u00e9ens: ils pourraient provoquer l'explosion du mont Paektu, et d\u00e9clencher l'une des \u00e9ruptions les plus violentes de l'histoire humaine. Le volcan, mesurant 2.744 m\u00e8tres d'altitude, se trouve sur la fronti\u00e8re entre la Cor\u00e9e du Nord et la Chine. Sa derni\u00e8re\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\/02\/mont-paektu.jpg?fit=568%2C405&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/02\/mont-paektu.jpg?fit=568%2C405&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/02\/mont-paektu.jpg?fit=568%2C405&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":1926,"url":"https:\/\/www.laterredufutur.com\/accueil\/que-se-passe-t-il-au-yellowstone\/","url_meta":{"origin":9210,"position":4},"title":"Que se passe t-il au Yellowstone ?","author":"Admin","date":"3 avril 2014","format":false,"excerpt":"Que se passe t-il au Yellowstone ? Suite au tremblement de terre de 4.8, C'est le plus important au Yellowstone depuis 1980, selon le US Geological Survey. Depuis plusieurs semaines, des bloggeurs ont pu filmer des troupeaux de bisons fuyant le parc naturel de Yellowstone secou\u00e9 par des petits tremblements\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\/2014\/04\/.._spaw_images_img94.gif?fit=410%2C281&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":25318,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-enorme-supervolcan-pourrait-se-cacher-sous-les-iles-de-lalaska\/","url_meta":{"origin":9210,"position":5},"title":"Un \u00e9norme supervolcan pourrait se cacher sous les \u00eeles de l&rsquo;Alaska","author":"Admin","date":"29 octobre 2023","format":false,"excerpt":"Un jeu g\u00e9ologique de connexion des \u00e9l\u00e9ments r\u00e9v\u00e8le des indices d'un gigantesque crat\u00e8re sous-marin. Un supervolcan myst\u00e9rieux, qui n'avait pas encore \u00e9t\u00e9 d\u00e9couvert, pourrait se cacher sous les \u00eeles Al\u00e9outiennes de l'Alaska. Une nouvelle \u00e9tude sugg\u00e8re qu'un large crat\u00e8re, cr\u00e9\u00e9 lors de l'explosion du supervolcan, relie au moins quatre volcans\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\/2023\/10\/alaska-supervolcan.jpg?fit=1028%2C580&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/alaska-supervolcan.jpg?fit=1028%2C580&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/alaska-supervolcan.jpg?fit=1028%2C580&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/10\/alaska-supervolcan.jpg?fit=1028%2C580&ssl=1&resize=700%2C400 2x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/9210","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=9210"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/9210\/revisions"}],"predecessor-version":[{"id":9212,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/9210\/revisions\/9212"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/9211"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=9210"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=9210"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=9210"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}