{"id":20440,"date":"2020-03-18T17:00:27","date_gmt":"2020-03-18T16:00:27","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=20440"},"modified":"2020-02-23T10:56:27","modified_gmt":"2020-02-23T09:56:27","slug":"le-volcan-f-a-lorigine-de-pierres-ponces-dans-locean-pacifique","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/le-volcan-f-a-lorigine-de-pierres-ponces-dans-locean-pacifique\/","title":{"rendered":"Le volcan F \u00e0 l&rsquo;origine de pierres ponces dans l&rsquo;oc\u00e9an Pacifique"},"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>Depuis ao\u00fbt 2019, une importante accumulation de pierres ponces a d\u00e9riv\u00e9 dans le Pacifique Sud-Ouest vers l&rsquo;Australie. Des chercheurs du GEOMAR Helmholtz Center for Ocean Research Kiel (Allemagne), ainsi que des coll\u00e8gues du Canada et de l&rsquo;Australie, ont maintenant identifi\u00e9 l&rsquo;origine de ce radeau de pierres ponces. C&rsquo;est un volcan sous-marin jusqu&rsquo;ici sans nom dans les eaux tonganes. L&rsquo;\u00e9tude a \u00e9t\u00e9 publi\u00e9e dans l&rsquo;International Journal of Volcanology and Geothermal Research .<\/p>\n<p>Certaines \u00e9ruptions volcaniques produisent un type de roche tr\u00e8s poreux avec une densit\u00e9 si faible qu&rsquo;elle flotte: la pierre ponce. Une quantit\u00e9 inhabituellement importante de cette esp\u00e8ce d\u00e9rive actuellement dans le Pacifique Sud-Ouest vers l&rsquo;Australie. Lorsqu&rsquo;il a \u00e9t\u00e9 aper\u00e7u pour la premi\u00e8re fois dans les eaux de l&rsquo;\u00c9tat insulaire des Tonga au d\u00e9but du mois d&rsquo;ao\u00fbt, il a presque form\u00e9 une couche coh\u00e9rente \u00e0 la surface de l&rsquo;oc\u00e9an. Le \u00abradeau de pierre ponce\u00bb a fait la une des journaux du monde entier.<\/p>\n<p>Volcano F<br \/>\nDivers volcans sous-marins ont \u00e9t\u00e9 cibl\u00e9s \u00e0 l&rsquo;\u00e9poque comme source potentielle. Mais la preuve directe de l&rsquo;origine exacte de la pierre ponce manquait jusqu&rsquo;\u00e0 pr\u00e9sent. Les chercheurs publient maintenant des preuves qui identifient clairement le coupable. Il s&rsquo;agit d&rsquo;un volcan sous-marin jusqu&rsquo;ici sans nom \u00e0 seulement 50 kilom\u00e8tres au nord-ouest de l&rsquo;\u00eele tongienne de Vava&rsquo;u. \u00abDans la litt\u00e9rature scientifique internationale, il n&rsquo;appara\u00eet que sous le num\u00e9ro 243091 ou sous le nom de Volcano F\u00bb, explique le Dr Philipp Brandl de GEOMAR, premier auteur de l&rsquo;\u00e9tude.<\/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>Ce n&rsquo;est qu&rsquo;en janvier de cette ann\u00e9e que le Dr Brandl et plusieurs de ses co-auteurs travaillaient dans la r\u00e9gion sur le navire de recherche allemand Sonne. L&rsquo;exp\u00e9dition, nomm\u00e9e Archim\u00e8de, visait \u00e0 \u00e9tudier la formation de nouvelles cro\u00fbtes dans la r\u00e9gion g\u00e9ologiquement extr\u00eamement dynamique entre les Fidji et les Tonga. \u00abLorsque j&rsquo;ai vu les reportages sur le radeau de pierre ponce dans les m\u00e9dias cet \u00e9t\u00e9, je suis devenu curieux et j&rsquo;ai commenc\u00e9 \u00e0 faire des recherches avec mes coll\u00e8gues\u00bb, explique le g\u00e9ologue.<\/p>\n<p>ESA Satellite Copernicus Sentinel-2<br \/>\nL&rsquo;\u00e9quipe a trouv\u00e9 ce qu&rsquo;elle cherchait sur une image satellite librement accessible. Sur une image du satellite Copernicus Sentinel-2 de l&rsquo;ESA prise le 6 ao\u00fbt 2019, des traces claires d&rsquo;une \u00e9ruption sous-marine active ont pu \u00eatre vues \u00e0 la surface de l&rsquo;eau. Les images \u00e9tant g\u00e9or\u00e9f\u00e9renc\u00e9es avec pr\u00e9cision, elles ont pu \u00eatre compar\u00e9es aux cartes bathym\u00e9triques correspondantes du fond marin. \u00abLes traces d&rsquo;\u00e9ruption correspondent exactement au volcan F\u00bb, explique le Dr Brandl.<\/p>\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\/PEsHLSFFQhQ?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>Adaptation <a href=\"https:\/\/www.laterredufutur.com\/accueil\/\" target=\"_blank\" rel=\"noopener noreferrer\">Terra Projects<\/a><\/p>\n<p>source : <a href=\"https:\/\/www.hydro-international.com\/content\/news\/volcano-f-is-the-origin-of-the-floating-stones-researchers-discovered\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/www.hydro-international.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"20440\">(378)<\/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>Depuis ao\u00fbt 2019, une importante accumulation de pierres ponces a d\u00e9riv\u00e9 dans le Pacifique Sud-Ouest vers l&rsquo;Australie. Des chercheurs du&#8230;<\/p>\n","protected":false},"author":1,"featured_media":20441,"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":"Le #volcan F \u00e0 l'origine de pierres ponces dans l'oc\u00e9an #Pacifique @laterredufutur.com Terra Projects","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":[19],"tags":[243,5673,2443,5755,684,48],"class_list":["post-20440","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seismes-et-volcans","tag-pacifique","tag-pierre-ponce","tag-sous-marin","tag-tonga","tag-video","tag-volcan","wpcat-19-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/01\/volcan-F-sous-marin-iles-tonga.jpeg?fit=680%2C408&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-5jG","jetpack-related-posts":[{"id":11460,"url":"https:\/\/www.laterredufutur.com\/accueil\/naissance-dune-ile-dans-le-pacifique-sud\/","url_meta":{"origin":20440,"position":0},"title":"Naissance d&rsquo;une \u00eele dans le Pacifique Sud","author":"Admin","date":"26 mars 2016","format":false,"excerpt":"Nous ne r\u00e9fl\u00e9chissons pas \u00e0 cette question sur une base quotidienne, mais la Terre est en constant changement. Cela se produit si lentement que nous ne pouvons pas vraiment le percevoir. Cependant parfois, les choses tendent \u00e0 s'acc\u00e9l\u00e9rer et tr\u00e8s rapidement. D\u00e9but 2015, un \u00e9quipage qui naviguait tranquillement sur le\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\/naissance-ile-pacifique-sud7.jpg?fit=1024%2C768&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/naissance-ile-pacifique-sud7.jpg?fit=1024%2C768&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/naissance-ile-pacifique-sud7.jpg?fit=1024%2C768&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/naissance-ile-pacifique-sud7.jpg?fit=1024%2C768&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":25729,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-mer-sest-mise-a-bouillir-leruption-volcanique-exceptionnelle-du-santorin-il-y-a-1-300-ans-indique-que-denormes-explosions-peuvent-se-produire-en-periode-de-calme\/","url_meta":{"origin":20440,"position":1},"title":"La mer s&rsquo;est mise \u00e0 bouillir : L&rsquo;\u00e9ruption volcanique exceptionnelle du Santorin, il y a 1 300 ans, indique que d&rsquo;\u00e9normes explosions peuvent se produire en p\u00e9riode de calme","author":"Admin","date":"5 avril 2024","format":false,"excerpt":"Une gigantesque couche de pierre ponce et de cendres d\u00e9couverte sous l'eau dans la caldeira de Santorin indique qu'une \u00e9ruption survenue en l'an 726 a \u00e9t\u00e9 beaucoup plus importante qu'on ne le pensait jusqu'\u00e0 pr\u00e9sent. Une \u00e9ruption du volcan Santorin survenue il y a 1 300 ans a \u00e9t\u00e9 beaucoup\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\/2024\/03\/eruption-santorin.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/03\/eruption-santorin.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/03\/eruption-santorin.jpg?fit=1024%2C1024&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/03\/eruption-santorin.jpg?fit=1024%2C1024&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":17219,"url":"https:\/\/www.laterredufutur.com\/accueil\/enquete-sur-leruption-qui-a-marque-le-moyen-age\/","url_meta":{"origin":20440,"position":2},"title":"Enqu\u00eate sur l\u2019\u00e9ruption qui a marqu\u00e9 le Moyen \u00c2ge","author":"Admin","date":"5 d\u00e9cembre 2018","format":false,"excerpt":"L\u2019origine d\u2019une \u00e9ruption survenue au Moyen \u00c2ge, l\u2019une des plus puissantes de ces dix mille derni\u00e8res ann\u00e9es, restait une \u00e9nigme... jusqu\u2019\u00e0 ce que des chercheurs fran\u00e7ais d\u00e9cident de mener leurs propres investigations. Une enqu\u00eate passionnante qui a fait l'objet cet hiver d'un documentaire sur Arte, \u00e0 red\u00e9couvrir dans cet article\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\/2018\/11\/samalas-volcan-indonesie-1.jpg?fit=1200%2C690&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/samalas-volcan-indonesie-1.jpg?fit=1200%2C690&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/samalas-volcan-indonesie-1.jpg?fit=1200%2C690&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/samalas-volcan-indonesie-1.jpg?fit=1200%2C690&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/samalas-volcan-indonesie-1.jpg?fit=1200%2C690&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":16297,"url":"https:\/\/www.laterredufutur.com\/accueil\/1257-lannee-du-cataclysme-du-millenaire-ou-le-mysterieux-volcan-du-moyen-age\/","url_meta":{"origin":20440,"position":3},"title":"1257, l&rsquo;ann\u00e9e du cataclysme du mill\u00e9naire ou le myst\u00e9rieux volcan du moyen age","author":"Admin","date":"15 f\u00e9vrier 2018","format":false,"excerpt":"Une \u00e9quipe internationale de scientifiques vient de montrer en 2016 que l\u2019\u00e9ruption du Samalas en 1257 aurait donn\u00e9 lieu \u00e0 l\u2019injection stratosph\u00e9rique de gaz volcaniques la plus importante depuis 2300 ans, \u00e0 l\u2019origine d\u2019un impact catastrophique sur le climat au 13\u00e8me si\u00e8cle, et aurait potentiellement provoqu\u00e9 une destruction massive de\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/02\/samalas.jpg?fit=960%2C640&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/02\/samalas.jpg?fit=960%2C640&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/02\/samalas.jpg?fit=960%2C640&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/02\/samalas.jpg?fit=960%2C640&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":2786,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-volcanisme-et-ses-consequences\/","url_meta":{"origin":20440,"position":4},"title":"Le Volcanisme et ses cons\u00e9quences","author":"Admin","date":"25 avril 2005","format":false,"excerpt":"Le volcanisme en Indon\u00e9sie est \u00e0 l'origine d'un certain nombre de \"records\" - celui du nombre des volcans actifs - celui du nombre de victimes : 170.000 depuis l'an 1.500. - celui du plus grand lac de crat\u00e8re de la plan\u00e8te : le lac Toba, \u00e0 Sumatra, (100 km de\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\/spaw\/images\/coulee1999etna.jpeg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":3560,"url":"https:\/\/www.laterredufutur.com\/accueil\/seisme-a-java-des-edifices-frappes-par-un-raz-de-maree\/","url_meta":{"origin":20440,"position":5},"title":"S\u00e9isme \u00e0 Java: des \u00e9difices frapp\u00e9s par un raz-de-mar\u00e9e","author":"Admin","date":"17 juillet 2006","format":false,"excerpt":"Une alerte au tsunami a\u00a0\u00e9t\u00e9 \u00e9mise lundi pour certaines r\u00e9gions de l'Indon\u00e9sie et de l'Australie apr\u00e8s un puissant s\u00e9isme survenu au large de l'\u00efle indon\u00e9sienne de Java, a annonc\u00e9 lundi le Centre d'alerte sur les tsunamis pour le Pacifique, situ\u00e9\u00a0\u00e0\u00a0 Hawa\u00ef. L'Institut national de g\u00e9ophysique am\u00e9ricain (USGS) a de son\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":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/20440","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=20440"}],"version-history":[{"count":3,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/20440\/revisions"}],"predecessor-version":[{"id":20518,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/20440\/revisions\/20518"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/20441"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=20440"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=20440"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=20440"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}