{"id":32416,"date":"2022-09-14T09:45:53","date_gmt":"2022-09-14T09:45:53","guid":{"rendered":"https:\/\/lesvolcansnews.net\/2022\/09\/14\/decouverte-le-monde-doit-se-preparer-a-une-eruption-volcanique-destructrice-de-grande-ampleur\/"},"modified":"2022-09-14T13:12:42","modified_gmt":"2022-09-14T13:12:42","slug":"decouverte-le-monde-doit-se-preparer-a-une-eruption-volcanique-destructrice-de-grande-ampleur","status":"publish","type":"post","link":"https:\/\/lesvolcansnews.net\/?p=32416","title":{"rendered":"D\u00e9couverte : Le monde doit se pr\u00e9parer \u00e0 une \u00e9ruption volcanique destructrice de grande ampleur"},"content":{"rendered":"\n<p class=\"has-light-green-cyan-background-color has-background\"><strong><mark style=\"background-color:rgba(0,0,0,0);color:#0693e3\" class=\"has-inline-color has-vivid-cyan-blue-color\"><em>Une \u00e9tude publi\u00e9e dans Nature, d\u00e9montre qu\u2019il existe 1 risque sur 6 pour qu\u2019une tr\u00e8s violente et puissante \u00e9ruption volcanique se produise dans le courant du si\u00e8cle prochain. Selon les chercheurs \u00e0 l\u2019origine de cette \u00e9tude, le monde est tr\u00e8s mal pr\u00e9par\u00e9 \u00e0 ce type de cataclysme qui pourrait causer l\u2019effondrement de notre civilisation.<\/em><\/mark><\/strong><\/p>\n\n\n\n<p><strong>Une \u00e9ruption volcanique destructrice de magnitude 7<\/strong><\/p>\n\n\n\n<p>Nous n\u2019y faisons g\u00e9n\u00e9ralement pas trop attention, mais il existe un risque bien r\u00e9el pour qu\u2019une \u00e9ruption volcanique destructrice mette en p\u00e9ril l\u2019existence m\u00eame de la vie sur Terre. Digne des plus grands films catastrophes hollywoodiens, un tel \u00e9v\u00e9nement pourrait bien devenir r\u00e9el au cours du prochain si\u00e8cle.<\/p>\n\n\n\n<p>D\u2019apr\u00e8s les chercheurs en volcanologie de l\u2019universit\u00e9 de Birmingham au Royaume-Uni, les effets d\u2019une \u00e9ruption volcanique d\u2019une telle puissance seraient similaires \u00e0 l\u2019impact d\u2019un ast\u00e9ro\u00efde d\u2019un kilom\u00e8tre de diam\u00e8tre percutant la Terre. Et pourtant, le risque qu\u2019un tel objet interstellaire vienne frapper notre plan\u00e8te est une centaine de fois moins important que le risque d\u2019une explosion volcanique d\u00e9vastatrice.<\/p>\n\n\n\n<p>Pour caract\u00e9riser la puissance d\u2019une \u00e9ruption volcanique, les chercheurs utilisent l\u2019indice d\u2019explosivit\u00e9 volcanique qui sert \u00e0 \u00e9valuer le pouvoir destructeur d\u2019une \u00e9ruption. Parmi les volcans les plus dangereux, il y a les volcans explosifs. Ils lib\u00e8rent de grosses quantit\u00e9s de gaz et de cendres dans la haute atmosph\u00e8re et peuvent provoquer des nu\u00e9es ardentes et des tsunamis.<\/p>\n\n\n\n<p>L\u2019indice d\u2019explosivit\u00e9 d\u2019un volcan (VEI) va de 0 \u00e0 8 et mesure la magnitude d\u2019une \u00e9ruption volcanique. Pour d\u00e9crire le pouvoir destructeur d\u2019un volcan, cet indice d\u2019explosivit\u00e9 combine plusieurs facteurs tels que le volume de mati\u00e8re \u00e9ject\u00e9, l\u2019altitude atteinte par les cendres, la dur\u00e9e de l\u2019\u00e9ruption et la p\u00e9n\u00e9tration de mati\u00e8re \u00e9ruptive dans la troposph\u00e8re et la stratosph\u00e8re.<br \/>Depuis 1815, il n\u2019y a plus eu d\u2019\u00e9ruptions volcaniques dont l\u2019indice d\u2019explosivit\u00e9 a \u00e9t\u00e9 sup\u00e9rieur \u00e0 6. Les vulcanologues estiment que des explosions volcaniques d\u2019indice 6 se produisent tous les 100 ans. Quant \u00e0 des \u00e9ruptions d\u2019indice 7 et 8, elles se produisent tous les 1000 ans et tous les 100\u2009000 ans.<\/p>\n\n\n\n<p><strong>L\u2019\u00e9ruption volcanique du Tambora en Indon\u00e9sie<\/strong><\/p>\n\n\n\n<p>Le 10 avril 1815 vers 10 heures du matin, les habitants de l\u2019\u00eele de Sumbawa en Indon\u00e9sie sont tir\u00e9s de leurs occupations par l\u2019explosion du volcan Tambora. Le monstre crache un panache de mati\u00e8re qui monte jusqu\u2019\u00e0 43 kilom\u00e8tres de haut en laissant en suspension dans l\u2019atmosph\u00e8re les plus grosses particules pendant deux semaines et les plus fines pendant des ann\u00e9es. En fin de journ\u00e9e vers 19 heures, l\u2019activit\u00e9 du volcan redouble de violence et une pluie de pierres ponces s\u2019abat sur la ville de Sanggar situ\u00e9e \u00e0 30 km. Lorsque ces chutes de pierres cessent vers 22 heures, la colonne \u00e9ruptive s\u2019effondre en plusieurs coul\u00e9es pyroclastiques qui se dispersent jusqu\u2019\u00e0 40 km du volcan.<\/p>\n\n\n\n<p><br>L\u2019\u00e9ruption, l\u2019une des plus longues de l\u2019histoire, cesse le 15 avril et les chutes de cendres cessent le 17 avril. Les volcanologues ont estim\u00e9 que cette \u00e9ruption volcanique avait un indice d\u2019explosivit\u00e9 de 7 sur un maximum de 8. Durant cette \u00e9ruption dont la puissance a \u00e9t\u00e9 estim\u00e9e \u00e0 10\u2009000 fois les explosions nucl\u00e9aires de Nagasaki et d\u2019Hiroshima, 11\u2009000 personnes ont \u00e9t\u00e9 directement tu\u00e9es.<\/p>\n\n\n\n<p> Presque 50\u2009000 personnes p\u00e9rirent par la suite en raison de la famine et des \u00e9pid\u00e9mies. Certains sp\u00e9cialistes estiment que cette \u00e9ruption fit un total de 1\u2009000\u2009000 victimes.<\/p>\n\n\n\n<p>La pr\u00e9sence des particules dans l\u2019atmosph\u00e8re a perturb\u00e9 le climat global de la plan\u00e8te et entra\u00een\u00e9 un refroidissement climatique en faisant chuter les temp\u00e9ratures de 0,5 \u00b0C \u00e0 plus de 1 \u00b0C l\u2019ann\u00e9e suivante. Cette \u00e9ruption qui perturba les r\u00e9coltes de c\u00e9r\u00e9ales constitua la cause des crises alimentaires en Europe en 1816 et 1817.<\/p>\n\n\n\n<p><strong>Les derni\u00e8res \u00e9ruptions volcaniques nous mettent en garde<\/strong><\/p>\n\n\n\n<p>En janvier dernier, une explosion volcanique majeure s\u2019est produite sur une \u00eele de l\u2019archipel des Tonga. Le volcan Hunga Tonga expulsa une tr\u00e8s grande quantit\u00e9 de magma qui r\u00e9agit violemment avec l\u2019eau de l\u2019oc\u00e9an provoquant de nombreuses explosions. L\u2019onde de choc se propagea sur l\u2019ensemble de la plan\u00e8te. Cette \u00e9ruption, qui ne fit que 5 morts et 4 bless\u00e9s, est l\u2019une des plus violentes enregistr\u00e9es avec les moyens modernes. Cette \u00e9ruption volcanique aurait pu \u00eatre plus d\u00e9vastatrice si elle avait \u00e9t\u00e9 plus longue.<\/p>\n\n\n\n<p>Cette \u00e9ruption volcanique de l\u2019archipel des Tonga est pourtant d\u2019une faible puissance si on la compare \u00e0 des \u00e9ruptions qui se d\u00e9roulent tous les 600 \u00e0 1000 ans et qui sont jusqu\u2019\u00e0 100 fois plus puissantes.<br \/>Actuellement, les scientifiques ne connaissent que l\u2019emplacement de 97 volcans pouvant donner lieu \u00e0 des \u00e9ruptions volcaniques avec un indice d\u2019explosivit\u00e9 de 7. Malheureusement, tous les volcans ne sont pas \u00e9quip\u00e9s de sismographes permettant de d\u00e9tecter des signes avant-coureurs d\u2019une \u00e9ruption de grande ampleur. Cela signifie donc qu\u2019il pourrait y avoir des dizaines d\u2019autres volcans d\u2019une extr\u00eame dangerosit\u00e9 sur notre plan\u00e8te.<\/p>\n\n\n\n<p>Pour les chercheurs, il existe un gros probl\u00e8me au niveau mondial dans l\u2019\u00e9tude des volcans pour des raisons budg\u00e9taires alors qu\u2019ils repr\u00e9sentent une menace bien r\u00e9elle. Il y a urgence et les gouvernements de nombreux pays ont malheureusement tendance \u00e0 sous-estimer les risques li\u00e9s \u00e0 l\u2019activit\u00e9 volcanique. Les chercheurs r\u00e9clament depuis des ann\u00e9es un satellite qui leur permettrait de surveiller de pr\u00e8s ces monstres endormis. Mais certains volcans peuvent rester en sommeil pendant des si\u00e8cles et se r\u00e9veiller soudainement en provoquant une explosion soudaine et d\u00e9vastatrice.<\/p>\n\n\n\n<p>Source : Michael Cassidy, Lara Mani, \u00ab Huge volcanic eruptions: time to prepare\u201d, Nature, 17 August 2022, https:\/\/www.nature.com\/articles\/d41586-022-02177-x<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une \u00e9tude publi\u00e9e dans Nature, d\u00e9montre qu\u2019il existe 1 risque sur 6 pour qu\u2019une tr\u00e8s violente et puissante \u00e9ruption volcanique se produise dans le courant du si\u00e8cle prochain. Selon les<\/p>\n","protected":false},"author":14,"featured_media":32425,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-32416","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-societe"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>D\u00e9couverte : Le monde doit se pr\u00e9parer \u00e0 une \u00e9ruption volcanique destructrice de grande ampleur - LES VOLCANS NEWS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lesvolcansnews.net\/?p=32416\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9couverte : Le monde doit se pr\u00e9parer \u00e0 une \u00e9ruption volcanique destructrice de grande ampleur - LES VOLCANS NEWS\" \/>\n<meta property=\"og:description\" content=\"Une \u00e9tude publi\u00e9e dans Nature, d\u00e9montre qu\u2019il existe 1 risque sur 6 pour qu\u2019une tr\u00e8s violente et puissante \u00e9ruption volcanique se produise dans le courant du si\u00e8cle prochain. 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