{"id":109292,"date":"2026-04-14T00:00:00","date_gmt":"2026-04-13T21:00:00","guid":{"rendered":"https:\/\/www.capmad.com\/news\/%news-category%\/442-seismes-enregistres-dans-le-sous-sol-marin-en-mars-2026\/"},"modified":"2026-04-14T11:01:19","modified_gmt":"2026-04-14T08:01:19","slug":"442-seismes-enregistres-dans-le-sous-sol-marin-en-mars-2026","status":"publish","type":"news","link":"https:\/\/www.capmad.com\/fr\/news\/autres-fr\/442-seismes-enregistres-dans-le-sous-sol-marin-en-mars-2026\/","title":{"rendered":"442 s\u00e9ismes enregistr\u00e9s dans le sous-sol marin en mars 2026"},"content":{"rendered":"

Un volcan toujours en mouvement sous la mer<\/b><\/h2>\n

300 s\u00e9ismes volcano-tectoniques, 139 s\u00e9ismes de longue p\u00e9riode et 2 s\u00e9ismes de tr\u00e8s longue p\u00e9riode ont \u00e9t\u00e9 enregistr\u00e9s dans la zone du \u00ab Fer \u00e0 Cheval \u00bb, au large de Petite-Terre, selon le dernier bulletin du R\u00e9seau de surveillance volcanologique et sismologique de Mayotte (REVOSIMA), publi\u00e9 en mars 2026.<\/b><\/p>\n

Ces chiffres confirment une activit\u00e9 sismique toujours pr\u00e9sente dans le sous-sol marin, entre 20 et 50 km de profondeur. Cette activit\u00e9 se concentre \u00e0 l\u2019est de Petite-Terre, dans une zone situ\u00e9e entre 5 et 15 km des c\u00f4tes. Les s\u00e9ismes volcano-tectoniques traduisent des fractures de roches li\u00e9es \u00e0 la pression du magma. Les s\u00e9ismes de longue p\u00e9riode sont associ\u00e9s au d\u00e9placement de fluides comme les gaz ou le magma. Les s\u00e9ismes de tr\u00e8s longue p\u00e9riode, plus rares, indiquent des mouvements plus lents et plus profonds du syst\u00e8me.<\/p>\n

Sur la p\u00e9riode du 1er au 31 mars 2026, l\u2019observatoire rel\u00e8ve en moyenne quatre s\u00e9ismes localisables par jour. Un niveau jug\u00e9 stable, sans changement notable par rapport aux mois pr\u00e9c\u00e9dents.<\/p>\n

Pour compl\u00e9ter ces donn\u00e9es, les scientifiques du REVOSIMA ont utilis\u00e9 un glider, un robot sous-marin, pour explorer les zones connues d\u2019\u00e9mission de gaz. Les mesures montrent que les d\u00e9gazages restent globalement stables et proches de ceux observ\u00e9s depuis plusieurs ann\u00e9es.<\/p>\n

Les analyses indiquent surtout la pr\u00e9sence de dioxyde de carbone, un gaz qui provient des profondeurs de la Terre. Cela confirme une activit\u00e9 volcanique toujours active sous le plancher oc\u00e9anique. Quelques signaux inhabituels ont \u00e9t\u00e9 relev\u00e9s entre certaines zones, mais ils ne montrent pas l\u2019apparition d\u2019un nouveau site important.<\/p>\n

Selon le REVOSIMA, les donn\u00e9es actuelles ne montrent pas de changement majeur dans la situation. Le volcan Fani Maor\u00e9 est probablement inactif depuis 2021, mais son \u00e9volution reste incertaine.<\/p>\n

Les scientifiques \u00e9voquent plusieurs sc\u00e9narios possibles : un arr\u00eat complet, une reprise d\u2019activit\u00e9 ou m\u00eame une nouvelle \u00e9ruption ailleurs dans la zone. Pour l\u2019instant, la situation reste stable, mais la surveillance continue afin de suivre toute \u00e9volution du syst\u00e8me volcanique.<\/p>\n","protected":false},"excerpt":{"rendered":"

Un volcan toujours en mouvement sous la mer 300 s\u00e9ismes volcano-tectoniques, 139 s\u00e9ismes de longue p\u00e9riode et 2 s\u00e9ismes de tr\u00e8s longue p\u00e9riode ont \u00e9t\u00e9 enregistr\u00e9s\u2026<\/span><\/p>\n","protected":false},"author":76,"featured_media":109294,"comment_status":"open","ping_status":"open","template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"tags":[],"news-category":[8128],"news-location":[8020],"class_list":["post-109292","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news-category-autres-fr","news-location-mayotte-fr"],"acf":[],"yoast_head":"\n442 s\u00e9ismes enregistr\u00e9s dans le sous-sol marin en mars 2026<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"442 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