{"id":4276,"date":"2019-02-11T12:13:15","date_gmt":"2019-02-11T12:13:15","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?p=4276"},"modified":"2019-02-11T12:21:01","modified_gmt":"2019-02-11T12:21:01","slug":"les-tephra-du-chaparrastique","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2019\/02\/11\/les-tephra-du-chaparrastique\/","title":{"rendered":"Les tephra du Chaparrastique"},"content":{"rendered":"

Voici ce que j\u2019\u00e9cris dans mon livre \u00ab\u00a0Volcanologie\u00a0\u00bb (5e<\/sup> \u00e9dition, Dunod, 2016), \u00e0 propos des tephra\u00a0:<\/p>\n

D\u2019autres fois, le magma, constitu\u00e9 d\u2019un m\u00e9lange de phases solide, liquide et\/ou gazeuse, arrive violemment en surface lors d\u2019une \u00e9ruption explosive<\/em>. Les mat\u00e9riaux (roches) pyroclastiques<\/em> (appel\u00e9s \u00e9galement pyroclastites<\/em> c\u2019est-\u00e0-dire \u00ab\u00a0cass\u00e9s par le feu\u00a0\u00bb ou aussi tephra<\/em>) projet\u00e9s \u00e0 grande vitesse, \u00e0 des altitudes et des distances importantes, recouvrent de grandes surfaces. Le terme g\u00e9n\u00e9ral de tephra englobe l\u2019ensemble des produits d\u2019origine volcanique \u00e0 l\u2019exception des laves, c’est-\u00e0-dire une grande vari\u00e9t\u00e9 de mat\u00e9riaux\u00a0: cendres, bombes, blocs, ponces, etc.<\/p>\n

\"\"<\/p>\n

Impressionnante accumulation de tephra sur les flancs du volcan Chaparrastique au Salvador (\u00a9 J.M. Bardintzeff).<\/p>\n

<\/p>\n

Le Chaparrastique, appel\u00e9 aussi San Miguel, est un strato-volcan imposant du Salvador (voir mon blog des 1\/1 et 7\/1\/2019).<\/p>\n

\"\"Jacques-Marie Bardintzeff, volcanologue, dans la mont\u00e9e du Chaparrastique (\u00a9 Dominique Mercury).<\/p>\n

\"\"<\/p>\n

La descente du Chaparrastique\u00a0; Jacques-Marie Bardintzeff en vert, chapeau blanc, donne l\u2019\u00e9chelle\u00a0! (\u00a9 J\u00e9r\u00f4me Terrazzoni).<\/p>\n","protected":false},"excerpt":{"rendered":"

Voici ce que j\u2019\u00e9cris dans mon livre \u00ab\u00a0Volcanologie\u00a0\u00bb (5e \u00e9dition, Dunod, 2016), \u00e0 propos des tephra\u00a0: D\u2019autres fois, le magma, constitu\u00e9 d\u2019un m\u00e9lange de phases solide, liquide et\/ou gazeuse, arrive violemment en surface lors d\u2019une \u00e9ruption explosive. Les mat\u00e9riaux (roches) pyroclastiques (appel\u00e9s \u00e9galement pyroclastites c\u2019est-\u00e0-dire \u00ab\u00a0cass\u00e9s par le feu\u00a0\u00bb ou aussi tephra) projet\u00e9s \u00e0 grande … Continuer la lecture de Les tephra du Chaparrastique<\/span> →<\/span><\/a><\/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":[6,8],"tags":[1404,1462,1463,1195,1425,487,586],"class_list":["post-4276","post","type-post","status-publish","format-standard","hentry","category-actualites","category-voyages","tag-chaparrastique","tag-pyroclastite","tag-roche-pyroclastique","tag-salvador","tag-san-miguel","tag-strato-volcan","tag-tephra"],"yoast_head":"\nLes tephra du Chaparrastique, 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\/2019\/02\/11\/les-tephra-du-chaparrastique\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les tephra du Chaparrastique, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"Voici ce que j\u2019\u00e9cris dans mon livre \u00ab\u00a0Volcanologie\u00a0\u00bb (5e \u00e9dition, Dunod, 2016), \u00e0 propos des tephra\u00a0: D\u2019autres fois, le magma, constitu\u00e9 d\u2019un m\u00e9lange de phases solide, liquide et\/ou gazeuse, arrive violemment en surface lors d\u2019une \u00e9ruption explosive. 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