{"id":72067,"date":"2025-10-27T12:00:00","date_gmt":"2025-10-27T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/chant-du-magma-revele-crise-sismique-a-santorin"},"modified":"2025-10-28T01:49:51","modified_gmt":"2025-10-28T01:49:51","slug":"chant-du-magma-revele-crise-sismique-a-santorin","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chant-du-magma-revele-crise-sismique-a-santorin","title":{"rendered":"Chant du Magma R\u00e9v\u00e8le Crise Sismique \u00c0 Santorin"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Entre octobre 2024 et fe\u0301vrier 2025, plus de 30.000 se\u0301ismes ont e\u0301te\u0301 enregistre\u0301s au large de l\u2019i\u0302le d\u2019Amorgos et de la caldeira de Santorin, entrai\u0302nant l\u2019e\u0301vacuation spontane\u0301e de milliers de touristes et habitants. Issue d\u2019une e\u0301ruption volcanique survenue a\u0300 l\u2019e\u0301poque minoenne, vers 1610 av. J.-C., et te\u0301moin d\u2019un se\u0301isme de magnitude 7,7 qui engendra un tsunami en 1956, la re\u0301gion est connue pour sa sensibilite\u0301 aux e\u0301ve\u0301nements sismiques.<\/p>\n<p>Mais la crise qui a marque\u0301 le de\u0301but d\u2019anne\u0301e e\u0301tait inhabituelle. \u00ab Cela ne ressemble pas a\u0300 une crise d\u2019origine tectonique \u00bb, confiait Fre\u0301de\u0301rique Leclerc, chercheuse a\u0300 Ge\u0301oazur, a\u0300 Sciences et Avenir, au plus fort de la crise, de\u0301but fe\u0301vrier 2025. La ge\u0301ologue et son e\u0301quipe e\u0301mettaient alors l\u2019hypothe\u0300se d\u2019un dyke: une fissure dans laquelle du magma s\u2019e\u0301tait infiltre\u0301, s\u2019est refroidi et a durci pour former une nouvelle roche traversant les couches mine\u0301rales de\u0301ja\u0300 existantes.<\/p>\n<p>Cette hypothe\u0300se a e\u0301te\u0301 confirme\u0301e par les travaux d\u2019une e\u0301quipe franc\u0327aise dirige\u0301e par Nikolai\u0308 Shapiro et Florent Brenguier, sismologues a\u0300 l\u2019ISTerre. Leurs re\u0301sultats viennent comple\u0301ter une e\u0301tude internationale sur la crise sismique de Santorin, publie\u0301e dans Nature en septembre 2025 (voir vide\u0301o ci-dessous).<\/p>\n<p><b>Le tremor, ou le \u00ab chant du magma \u00bb<\/b><\/p>\n<p>L\u2019e\u0301quipe grenobloise a apporte\u0301 un e\u0301le\u0301ment cle\u0301 dans la caracte\u0301risation de cette crise. Au-dela\u0300 de l\u2019essaim de se\u0301ismes \u2013 une succession de se\u0301ismes tre\u0300s rapproche\u0301s dans le temps et l\u2019espace \u2013 les analyses fines des donne\u0301es sismologiques ont permis de mettre en e\u0301vidence un tremor, caracte\u0301ristique de la propagation d\u2019un dyke.<\/p>\n<p>\u00ab Lorsque le magma se propage dans la crou\u0302te, il doit pousser autour de lui et fracasser la roche sous pression pour se frayer un chemin vers la surface, explique Florent Brenguier, co-auteur de l\u2019e\u0301tude. Parfois, il re\u0301veille des failles de\u0301ja\u0300 sur le point de casser. C\u2019est ce qui produit un enchai\u0302nement de gros se\u0301ismes de magnitude 5, comme on a pu l\u2019observer. \u00bb<\/p>\n<p>Cette succession de chocs du magma contre la crou\u0302te oce\u0301anique ge\u0301ne\u0300re des milliers de petits se\u0301ismes en continu, qu\u2019on appelle le tremor. \u00ab On passe d\u2019un essaim de se\u0301ismes a\u0300 un tremor quand on ne peut plus distinguer les limites entre les se\u0301ismes. Le tremor, c\u2019est comme la re\u0301sonance d\u2019un orgue: c\u2019est le chant du magma en profondeur \u00bb, illustre le sismologue.<\/p>\n<p>Le tremor est un phe\u0301nome\u0300ne connu et particulie\u0300rement observe\u0301 sous le ce\u0301le\u0300bre Piton de la Fournaise. C\u2019est d\u2019ailleurs gra\u0302ce aux donne\u0301es de surveillance du volcan re\u0301unionnais que les chercheurs de l\u2019ISTerre ont pu cre\u0301er des algorithmes d\u2019intelligence artificielle capables d\u2019identifier ce phe\u0301nome\u0300ne.<\/p>\n<p><b>Un re\u0301servoir magmatique partage\u0301<\/b><\/p>\n<p>Dans les zones en extension, comme au large d\u2019Amorgos, la terre se fracture et peut faciliter le passage du magma. Ici, le dyke s\u2019est propage\u0301 sur 13 km et 300 millions de me\u0300tres cubes de magma sont remonte\u0301s jusqu\u2019a\u0300 4 km seulement sous le plancher oce\u0301anique. Plus e\u0301tonnant encore, la succession d\u2019e\u0301ve\u0301nements pendant la crise pourrait indiquer que les deux syste\u0300mes volcaniques de Santorin et de Kolumbo, se\u0301pare\u0301s de seulement 7 km, partagent la me\u0302me re\u0301serve de magma en profondeur.<\/p>\n<p>Six mois avant la crise, les chercheurs ont mesure\u0301 un gonflement du volcan de Santorin, interpre\u0301te\u0301 comme une injection magmatique \u2014 du magma remontant vers la surface. En paralle\u0300le, le volcan de Kolumbo connai\u0302t une de\u0301flation, ce qui pourrait impliquer une connexion hydraulique entre les volcans voisins. Pie\u0301ge\u0301 aux alentours de 10 km de profondeur, le magma aurait ensuite migre\u0301 vers Amorgos et Kolumbo, formant un dyke.<\/p>\n<p>\u00ab Nous n\u2019avons pour le moment aucune preuve concre\u0300te d\u2019une alimentation commune. Ce sont des hypothe\u0300ses a\u0300 ve\u0301rifier, ajoute le sismologue franc\u0327ais. Mais cela montre qu\u2019il ne faut pas se focaliser sur le syste\u0300me volcanique de Santorin, mais surveiller toute la zone \u00bb. A\u0300 ce jour, la crise est passe\u0301e mais il est pour le moment possible pour les chercheurs de pre\u0301voir de tels e\u0301ve\u0300nements.<\/p>\n<p><b>La \u00ab tuyauterie en profondeur \u00bb de l\u2019Auvergne<\/b><\/p>\n<p>Dans le Massif central, l\u2019e\u0301quipe d\u2019ISTerre a de\u0301ja\u0300 enregistre\u0301 des signaux te\u0301moins d\u2019une activite\u0301 magmatique en grande profondeur. \u00ab On appelle c\u0327a des se\u0301ismes profonds longue pe\u0301riode \u00bb, explique Florent Brenguier. Ces signaux sugge\u0300rent que les re\u0301servoirs magmatiques proches du Puy-de-Do\u0302me pourraient encore e\u0302tre actifs. Dans le cadre du projet MACIV, 800 balises sismologiques ont e\u0301te\u0301 installe\u0301es afin d\u2019e\u0301tablir la premie\u0300re e\u0301chographie des volcans d\u2019Auvergne. L\u2019objectif est de comprendre les connexions entre les re\u0301servoirs \u2014 la \u00ab tuyauterie en profondeur \u00bb, en quelque sorte.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Entre octobre 2024 et fe\u0301vrier 2025, plus de 30.000 se\u0301ismes ont e\u0301te\u0301 enregistre\u0301s au large de l\u2019i\u0302le d\u2019Amorgos et de la caldeira de Santorin, entrai\u0302nant l\u2019e\u0301vacuation spontane\u0301e de milliers de touristes et habitants. Issue d\u2019une e\u0301ruption volcanique survenue a\u0300 l\u2019e\u0301poque minoenne, vers 1610 av. J.-C., et te\u0301moin d\u2019un se\u0301isme de magnitude 7,7 [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":72066,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-72067","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Chant du Magma R\u00e9v\u00e8le Crise Sismique \u00c0 Santorin - Senegal<\/title>\n<meta name=\"description\" content=\"Entre octobre 2024 et fe\u0301vrier 2025, plus de 30.000 se\u0301ismes ont e\u0301te\u0301 enregistre\u0301s au large de l\u2019i\u0302le d\u2019Amorgos et de l ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chant-du-magma-revele-crise-sismique-a-santorin\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chant du Magma R\u00e9v\u00e8le Crise Sismique \u00c0 Santorin\" \/>\n<meta property=\"og:description\" content=\"Entre octobre 2024 et fe\u0301vrier 2025, plus de 30.000 se\u0301ismes ont e\u0301te\u0301 enregistre\u0301s au large de l\u2019i\u0302le d\u2019Amorgos et de l ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chant-du-magma-revele-crise-sismique-a-santorin\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2025-10-27T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-28T01:49:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/10\/sm_1761644805.723113.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chant-du-magma-revele-crise-sismique-a-santorin#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chant-du-magma-revele-crise-sismique-a-santorin\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Chant du Magma R\u00e9v\u00e8le Crise Sismique \u00c0 Santorin\",\"datePublished\":\"2025-10-27T12:00:00+00:00\",\"dateModified\":\"2025-10-28T01:49:51+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chant-du-magma-revele-crise-sismique-a-santorin\"},\"wordCount\":876,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chant-du-magma-revele-crise-sismique-a-santorin#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/10\/sm_1761644805.723113.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chant-du-magma-revele-crise-sismique-a-santorin#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chant-du-magma-revele-crise-sismique-a-santorin\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/chant-du-magma-revele-crise-sismique-a-santorin\",\"name\":\"Chant du Magma R\u00e9v\u00e8le Crise Sismique \u00c0 Santorin - 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