Africa-Press – Senegal. <\/strong><\/span>Une puissante explosion s\u2019est produite le 9 de\u0301cembre sur ce volcan philippin, a\u0300 l\u2019origine d\u2019un panache de cendres d\u2019au moins 4 kilome\u0300tres de haut, d\u2019une importante onde de pression et d\u2019une nue\u0301e ardente impressionnante ! L\u2019alerte volcanique a e\u0301te\u0301 e\u0301leve\u0301e a\u0300 3, assortie d\u2019une zone d\u2019exclusion de 6 kilome\u0300tres obligeant des dizaines de milliers de personnes a\u0300 e\u0301vacuer.<\/p>\nLundi 9 de\u0301cembre, a\u0300 15 h 03, une puissante explosion a e\u0301te\u0301 entendue par les habitants. L’onde de choc a fait trembler des objets dans un rayon de 30 kilome\u0300tres et des stations sismiques a\u0300 5 kilome\u0300tres du sommet ont enregistre\u0301 138 dB (a\u0300 partir de 110 dB, les sons peuvent de\u0301grader tre\u0300s rapidement l’audition) ! Un panache de cendres assez volumineux s’est de\u0301veloppe\u0301 jusqu’a\u0300 au moins 4 kilome\u0300tres de haut, occasionnant des retombe\u0301es de cendres dans une vaste zone a\u0300 l’ouest du volcan. En outre, une nue\u0301e ardente s’est forme\u0301e sur le flanc sud-sud-est du volcan, jusqu’a\u0300 environ 3 kilome\u0300tres du sommet, pour des images assez impressionnantes, mais heureusement aucun de\u0301ga\u0302t !<\/p>\n
De nombreux signaux pre\u0301curseurs<\/b><\/p>\n
L’alerte volcanique avait e\u0301te\u0301 e\u0301leve\u0301e au niveau 2 sur ce volcan apre\u0300s une forte explosion le 3 juin 2024. Ensuite, les quantite\u0301s de SO2 libe\u0301re\u0301es par le volcan de\u0301passe\u0300rent largement les 1 300 tonnes par jour de moyenne enregistre\u0301es lors du premier semestre de l’anne\u0301e, avec un record de 11 000 tonnes par jour le 11 septembre ! Des odeurs de soufre e\u0301taient parfois signale\u0301es dans les villages au pied du volcan, ce qui poussa a\u0300 des premie\u0300res e\u0301vacuations. Puis, a\u0300 partir du 19 octobre, des e\u0301missions de cendres de 300 a\u0300 800 me\u0300tres de haut e\u0301taient re\u0301gulie\u0300rement e\u0301mises au-dessus du volcan, mais leur observation au microscope indiquait des roches anciennes pulve\u0301rise\u0301es, signe d’une activite\u0301 phre\u0301atique. Le magma qui de\u0301stabilisa le syste\u0300me hydrothermal du volcan, a\u0300 l’origine de ces premie\u0300res e\u0301missions cendreuses, a visiblement fait surface ce 9 de\u0301cembre.<\/p>\n
L’alerte a donc e\u0301te\u0301 e\u0301leve\u0301e d’un niveau supple\u0301mentaire et la zone interdite d’acce\u0300s a e\u0301te\u0301 repousse\u0301e de 4 a\u0300 6 kilome\u0300tres autour du volcan. Pas moins de 87 000 personnes seraient en cours d’e\u0301vacuation…<\/p>\n
Pour plus d’informations et d’analyses sur la Senegal<\/span>, suivez Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"par Ludovic Leduc Africa-Press – Senegal. Une puissante explosion s\u2019est produite le 9 de\u0301cembre sur ce volcan philippin, a\u0300 l\u2019origine d\u2019un panache de cendres d\u2019au moins 4 kilome\u0300tres de haut, d\u2019une importante onde de pression et d\u2019une nue\u0301e ardente impressionnante ! L\u2019alerte volcanique a e\u0301te\u0301 e\u0301leve\u0301e a\u0300 3, assortie d\u2019une zone d\u2019exclusion de 6 kilome\u0300tres […]<\/p>\n","protected":false},"author":82,"featured_media":64158,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-64159","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"\n
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