{"id":210605,"date":"2020-06-21T09:57:19","date_gmt":"2020-06-21T09:57:19","guid":{"rendered":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/?p=210605"},"modified":"2020-06-21T09:57:28","modified_gmt":"2020-06-21T09:57:28","slug":"le-lac-nyos-le-lac-mortel-du-cameroun-qui-a-tue-plus-de-1-700-personnes-en-une-nuit","status":"publish","type":"post","link":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/le-lac-nyos-le-lac-mortel-du-cameroun-qui-a-tue-plus-de-1-700-personnes-en-une-nuit\/","title":{"rendered":"Le lac Nyos : Le lac mortel du Cameroun qui a tu\u00e9 plus de 1 700 personnes en une nuit"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Le lac Nyos au Cameroun est d\u00e9crit comme l&rsquo;une des eaux les plus meurtri\u00e8res du monde, responsable d&rsquo;une catastrophe naturelle mortelle qui a co\u00fbt\u00e9 la vie \u00e0 de nombreuses personnes ainsi qu&rsquo;\u00e0 des animaux domestiques le 21 ao\u00fbt 1986.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le lac Nyos est tr\u00e8s profond. Il s&rsquo;\u00e9tend sur plus de 198 m\u00e8tres et est entour\u00e9 de falaises rocheuses. Dans le climat tropical du Cameroun, la couche d&rsquo;eau chaude superficielle forme une sorte de chapeau recouvrant tout le lac.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le 21 ao\u00fbt, les habitants du village de Lower Nyos s&rsquo;\u00e9taient couch\u00e9s t\u00f4t la veille, mais au matin, environ 1 800 personnes et 3 000 animaux domestiques ont \u00e9t\u00e9 d\u00e9couverts morts. Un ph\u00e9nom\u00e8ne volcanique \u00e9trange et rare, associ\u00e9 au lac Nyos tout proche, avait co\u00fbt\u00e9 la vie \u00e0 ces personnes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Selon le magazine Smithsonian, cette nuit-l\u00e0, \u00ab\u00a0de nombreuses victimes ont \u00e9t\u00e9 retrouv\u00e9es \u00e0 l&rsquo;endroit m\u00eame o\u00f9 elles se trouvaient normalement vers 9 heures du soir, ce qui sugg\u00e8re qu&rsquo;elles sont mortes sur place\u00a0\u00bb. Les corps gisaient pr\u00e8s de feux de cuisson, certains \u00e9taient regroup\u00e9s \u00e0 l&rsquo;entr\u00e9e des portes. Certaines personnes qui \u00e9taient rest\u00e9es inconscientes pendant plus d&rsquo;un jour se sont finalement r\u00e9veill\u00e9es, ont vu les membres de leur famille \u00e9tendus morts et se sont ensuite suicid\u00e9es\u00a0\u00bb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le lac Nyos est situ\u00e9 le long de la ligne volcanique du Cameroun (CVL), une cha\u00eene de volcans et de lacs de crat\u00e8res volcaniques de 950 miles de long qui s&rsquo;\u00e9tend du Golfe de Guin\u00e9e au Cameroun et au Nigeria.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Selon Forbes, l&rsquo;origine de la CVL n&rsquo;est pas encore compl\u00e8tement comprise. \u00ab\u00a0Il est possible que lors de la s\u00e9paration de l&rsquo;Afrique et de l&rsquo;Am\u00e9rique du Sud, il y a environ 150 millions d&rsquo;ann\u00e9es, une troisi\u00e8me faille ait commenc\u00e9 \u00e0 se d\u00e9velopper, mais n&rsquo;a pas r\u00e9ussi \u00e0 devenir un bassin oc\u00e9anique comme l&rsquo;oc\u00e9an Atlantique\u00a0\u00bb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les g\u00e9ologues ne savent toujours pas pourquoi le bouchon d&rsquo;eau chaude, qui retenait les gaz au fond du lac, a \u00e9chou\u00e9 cette nuit-l\u00e0, car les gaz volcaniques, comme le soufre et le dioxyde de carbone, provenant du sol, se concentrent de plus en plus au fond du lac.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Juste avant la catastrophe, les survivants se sont souvenus qu&rsquo;un grondement avait \u00e9t\u00e9 entendu aux alentours du lac Nyos. Un nuage, d&rsquo;une densit\u00e9 sup\u00e9rieure \u00e0 celle de l&rsquo;air ambiant, s&rsquo;est d\u00e9plac\u00e9 jusqu&rsquo;\u00e0 24 km du lac dans les vall\u00e9es environnantes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certains survivants ont plus tard d\u00e9clar\u00e9 avoir senti une \u00e9trange odeur que l&rsquo;on pense provenir des gaz sulfuriques, et des dizaines de personnes se sont soudainement effondr\u00e9es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Comme l&rsquo;origine volcanique des lacs \u00e9tait inconnue des gens, ils ont attribu\u00e9 l&rsquo;incident \u00e0 des pouvoirs surnaturels, comme des dieux, des esprits ou des anc\u00eatres en col\u00e8re. Les gens ont donc ignor\u00e9 le lac Nyos et ses environs pendant longtemps, jusqu&rsquo;\u00e0 plus tard.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;une des catastrophes les plus d\u00e9concertantes, les scientifiques dans leurs enqu\u00eates ont suppos\u00e9 que \u00ab\u00a0le volcan en sommeil depuis longtemps sous son crat\u00e8re \u00e9tait entr\u00e9 en \u00e9ruption, d\u00e9gageant une sorte de fum\u00e9e mortelle\u00a0\u00bb, selon le rapport du Smithsonian.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Au fil des ans, les chercheurs ont cependant d\u00e9couvert \u00ab\u00a0une catastrophe g\u00e9ologique monstrueuse et bien plus insidieuse, que l&rsquo;on croyait n&rsquo;exister que dans le mythe\u00a0\u00bb, ajoute le rapport.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les chercheurs ont \u00e9galement d\u00e9couvert que la catastrophe pourrait se reproduire \u00e0 Nyos et dans au moins un autre lac \u00e0 proximit\u00e9 &#8211; le lac Monoun, qui, le 15 ao\u00fbt 1984, a enregistr\u00e9 une explosion, tr\u00e8s probablement caus\u00e9e par une soudaine \u00e9ruption de gaz, tuant 37 personnes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Afin d&rsquo;\u00e9viter que ces lacs n&rsquo;explosent \u00e0 nouveau, des ing\u00e9nieurs ont install\u00e9 en 2011 des tuyaux dans les deux lacs pour aspirer le CO2 du lit du lac et le lib\u00e9rer tr\u00e8s progressivement dans l&rsquo;air, selon Science Alert.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depuis, un barrage a \u00e9t\u00e9 construit autour du mur du lac Nyos pour le prot\u00e9ger. Malgr\u00e9 ces mesures pr\u00e9ventives, le lac est toujours consid\u00e9r\u00e9 par de nombreux experts comme dangereux et l&rsquo;\u00e9v\u00e9nement de 1986 est toujours grav\u00e9 dans l&rsquo;esprit des Camerounais.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><br>Cr\u00e9dit photo: cameroonreport<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le lac Nyos au Cameroun est d\u00e9crit comme l&rsquo;une des eaux les plus meurtri\u00e8res du monde, responsable d&rsquo;une catastrophe naturelle mortelle qui a co\u00fbt\u00e9 la vie \u00e0 de nombreuses personnes ainsi qu&rsquo;\u00e0 des animaux domestiques le 21 ao\u00fbt 1986. Le lac Nyos est tr\u00e8s profond. Il s&rsquo;\u00e9tend sur plus de 198 m\u00e8tres et est entour\u00e9 &hellip;<\/p>\n","protected":false},"author":63,"featured_media":210612,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8761],"tags":[179881,179880,3902],"class_list":["post-210605","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cameroun","tag-1700-personnes","tag-lac-nyos","tag-mortel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le lac Nyos : Le lac mortel du Cameroun qui a tu\u00e9 plus de 1 700 personnes en une nuit<\/title>\n<meta name=\"description\" content=\"Le lac Nyos au Cameroun a \u00e9t\u00e9 d\u00e9crit comme l&#039;un des plans d&#039;eau les plus meurtriers du monde, responsable d&#039;une catastrophe naturelle mortelle qui a co\u00fbt\u00e9 la vie \u00e0 de nombreuses 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