www.futura-sciences.com\/planete\/actualites\/volcanologie-volcan-saut-chimie-fumerolles-serait-bon-indicateur-eruption-65269\/<\/a><\/p>\n![\"bardintzef-ita-88-2-10-etna_cratere_central-s\"](\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/11\/Bardintzef.ITA-88.2.10-Etna_crat\u00e8re_central.s-450x293.jpg\")
<\/p>\n
Des gaz s\u2019\u00e9chappent du crat\u00e8re central de l\u2019Etna. Photo de\u2026 1988 ! (\u00a9 J.M. Bardintzeff).<\/p>\n
Voici ce que j\u2019\u00e9cris dans mon livre \u00ab\u00a0Volcanologie\u00a0\u00bb (Dunod, 5e<\/sup> \u00e9dition, 2016)\u00a0:<\/p>\nLes variations de la temp\u00e9rature et de la composition chimique des gaz volcaniques s\u2019av\u00e8rent \u00eatre des indicateurs efficaces de l\u2019activit\u00e9 d\u2019un volcan. Par exemple, avant et pendant une \u00e9ruption, les teneurs en CO et H2<\/sub>S augmentent. Les rapports CO\/CO2<\/sub>, H2<\/sub>S\/SO2<\/sub> et H2<\/sub>\/H2<\/sub>O augmentent dans le m\u00eame sens, t\u00e9moignant d\u2019apports de fluides magmatiques profonds plus r\u00e9duits que les fluides superficiels. He augmente aussi, ainsi que les rapports He\/C et S\/C. Une augmentation du rapport F\/Cl (avec la temp\u00e9rature) et inversement une diminution du rapport B\/NH4<\/sub>, indiquent une forte croissance de la pression de vapeur en profondeur, signe d’un risque d\u2019\u00e9ruption important.<\/p>\n","protected":false},"excerpt":{"rendered":"Lors d’une \u00e9ruption, les gaz pr\u00e9c\u00e8dent souvent les solides et constituent donc des “signes avant-coureurs”.\u00a0 Leur analyse chimique est donc importante pour une bonne pr\u00e9vision. Laurent Sacco fait une int\u00e9ressante mise au point pour Futura Plan\u00e8te : www.futura-sciences.com\/planete\/actualites\/volcanologie-volcan-saut-chimie-fumerolles-serait-bon-indicateur-eruption-65269\/ Des gaz s\u2019\u00e9chappent du crat\u00e8re central de l\u2019Etna. Photo de\u2026 1988 ! (\u00a9 J.M. Bardintzeff).<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[6],"tags":[21,168,380,17,18,613,615,616,3,329,13],"class_list":["post-1787","post","type-post","status-publish","format-standard","hentry","category-actualites","tag-bardintzeff","tag-cratere","tag-dunod","tag-eruption","tag-etna","tag-gaz-volcanique","tag-prevision","tag-sacco","tag-volcan","tag-volcanologie","tag-volcanologue"],"yoast_head":"\n
Les gaz, pr\u00e9curseurs volcaniques, par Jacques-Marie Bardintzeff<\/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:\/\/blogs.futura-sciences.com\/bardintzeff\/2016\/11\/24\/gaz-precurseurs-volcaniques\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les gaz, pr\u00e9curseurs volcaniques, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"Lors d’une \u00e9ruption, les gaz pr\u00e9c\u00e8dent souvent les solides et constituent donc des “signes avant-coureurs”.\u00a0 Leur analyse chimique est donc importante pour une bonne pr\u00e9vision. Laurent Sacco fait une int\u00e9ressante mise au point pour Futura Plan\u00e8te : www.futura-sciences.com\/planete\/actualites\/volcanologie-volcan-saut-chimie-fumerolles-serait-bon-indicateur-eruption-65269\/ Des gaz s\u2019\u00e9chappent du crat\u00e8re central de l\u2019Etna. Photo de\u2026 1988 ! (\u00a9 J.M. 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