Souvent mesuré dans les fumeroles et les sols volcaniques, le radon – gaz radioactif issu de la désintégration de l’uranium – n’avait jamais pu être mesuré dans les gaz volcaniques primaires du fait de la difficulté à le prélever et de sa courte période radioactive. C’est désormais chose faite grâce aux travaux de chercheurs clermontois et italiens. En équipant pendant plus de 5 mois le sommet de l’Etna d’un dispositif inédit composé de 70 dosimètres passifs, ils ont pu dresser la première cartographie de l’émanation de radon autour du cratère central du volcan sicilien, le plus actif d’Europe.
Les effets sur le climat
En plus du dégazage préférentiel du radon à travers le sol dans les zones fortement hydrothermalisées et/ou fracturées, leur étude montre de très forts enrichissements en radon dans les zones du sommet exposées au vent dominant, et donc au panache gazeux émis en continu par les cratères actifs. C’est la première fois que la teneur en radon des gaz primaires est ainsi déterminée, mettant en évidence des activités en radon jusqu’à 550 Bq/m3.
Environnement et santé
Outre l’impact potentiel sur l’environnement et la santé de tels niveaux de radioactivité naturelle, la connaissance des activités en radon dans les gaz volcaniques ouvre la porte à de futures études en géochimie des gaz. L’objectif: mieux comprendre les processus magmatiques superficiels avant éruption, ainsi que les échelles de temps caractéristiques du dégazage. En outre, cette étude montre de manière inédite que l’activité du radon dans le panache gazeux de l’Etna est susceptible de varier en fonction de l’intensité éruptive du volcan. Un premier pas vers l’utilisation du radon mesuré dans l’air comme signal précurseur d’éruption ?
En savoir plus:
Radon Activity in Volcanic Gases of Mt. Etna by Passive Dosimetry, J. Geophys. Res. Solid Earth, 125.
Terray L., P.J. Gauthier, V. Breton, S. Giammanco, O. Sigmarsson, G. Salerno, T. Caltabiano et A. Falvard.
https://doi.org/10.1029/2019JB019149
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Anne Fornier
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Anne Fornier2020-02-28 14:10:352021-09-15 18:33:16GEOASTROLAB – PROJET DE LABORATOIRE DE GÉOSCIENCES ET D’ASTRONOMIE
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Anne Fornier
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Anne Fornier2019-12-08 12:32:012021-09-15 18:37:43LE REVEIL DU SUPER-VOLCAN NAPOLITAIN SERAIT UNE CATASTROPHE
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Anne Fornier
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Anne Fornier2019-11-18 16:22:482021-09-15 18:40:44INTERVIEW D’ALEXANDRE DEL VALLE À ANNE FORNIER
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Anne Fornier
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Anne Fornier2019-11-12 15:08:322021-09-15 18:46:11UNE SÉRIE DE DOCUMENTAIRES POUR ÉDUQUER LE MONDE
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1188
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Anne Fornier
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Anne Fornier2019-09-09 15:00:002021-09-15 18:56:03INTERVIEW D’ANNE FORNIER SUR JET8
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1485
1980
Anne Fornier
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Anne Fornier2019-09-09 14:24:052021-09-15 18:59:55LA FONDATION AU MEXIQUE
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698
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Anne Fornier
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Anne Fornier2019-08-22 08:32:462021-09-15 19:03:16COMMENT VOUS AFFECTE UNE ÉRUPTION VOLCANIQUE?
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Anne Fornier
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Anne Fornier2019-08-06 11:19:122021-09-15 19:11:08SITUATION PRÉOCCUPANTE DU VOLCAN UBINAS
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1895
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Anne Fornier
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Anne Fornier2019-08-05 15:16:332021-09-15 19:16:50LA FONDATION DANS LE DAUPHINÉ LIBÉRÉ
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2059
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Anne Fornier
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Anne Fornier2019-08-05 14:33:232021-09-15 19:19:30LA FONDATION AU BAILLEUR SAVOYARD
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Anne Fornier
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Anne Fornier2019-06-11 15:34:472021-09-15 19:22:25EL TEIDE FAIT PARTIE D’UN SYSTÈME VOLCANIQUE ACTIF
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1531
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Anne Fornier
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Anne Fornier2019-06-11 08:27:342021-09-15 16:29:00ÉRUPTION DU SINABUNG
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Anne Fornier
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Anne Fornier2019-06-04 14:55:072021-09-15 19:27:16L’ERUPTION DE YELLOWSTONE POURRAIT PROVOQUER LA FIN DE L’HUMANITÉ
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Anne Fornier
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Anne Fornier2019-05-27 16:05:142021-09-15 19:29:36QUAND LA TERRE RÉVEILLE SA CEINTURE DE FEU.
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1848
1980
Anne Fornier
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Anne Fornier2019-05-07 16:01:022021-09-15 19:32:20LA FONDATION SUR RADIO OLOT
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1709
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Anne Fornier
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Anne Fornier2019-05-02 10:51:282021-09-15 19:35:07VOLCANO SCHOOL À OLOT
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628
715
Anne Fornier
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Anne Fornier2019-05-02 08:14:052021-09-15 19:40:25LA FONDATION ET VOLCANO SCHOOL DANS IBERIAN PRESS
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739
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Anne Fornier
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Anne Fornier2019-05-02 08:00:432021-09-15 19:46:12LA FONDATION ET VOLCANO SCHOOL AU GARROTXI
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Anne Fornier
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Anne Fornier2019-04-29 12:10:492021-09-15 19:50:12PREMIER ÉCHANGE D’ÉCOLES SUR LES VOL VOLCAN ET LEURS RISQUES
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815
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Anne Fornier
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Anne Fornier2019-04-26 07:52:482021-09-15 19:54:15TE ACERCO A MI VOLCAN
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Anne Fornier
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Anne Fornier2019-04-25 13:31:522021-09-16 11:09:18LA FONDATION À EL PUNT AVUI
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Anne Fornier
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Anne Fornier2019-04-24 14:30:112021-09-16 11:03:06ANNE FORNIER : VOLCANOLOGUE ET LANCEUSE D’ALERTE
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1485
1980
Anne Fornier
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Anne Fornier2019-04-09 08:12:012021-09-16 10:58:44LACS MORTELS
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Anne Fornier
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Anne Fornier2019-04-04 14:06:182021-09-16 10:55:23LE VOLCAN PARICUTIN. SENTIERS ET INTERPRÉTATION.
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382
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Anne Fornier
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Anne Fornier2019-04-04 14:04:492021-09-16 10:52:05LES SEPT LUMINAIRES. DES CRATÈRES ENTRE LES VILLAGES.
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Anne Fornier
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Anne Fornier2019-04-04 12:47:462021-09-16 10:45:03RÉSEAU INTERNATIONAL DE GUIDES VOLCANIQUES
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Anne Fornier
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Anne Fornier2019-04-03 16:24:092021-09-16 10:41:24RISQUES NATURELS À GOMA ET DANS LES VILLAGES VOISINS
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Anne Fornier
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Anne Fornier2019-04-03 15:48:212021-09-16 10:34:53INFLUENCES DE LA DYNAMIQUE DES SOURCES D’HUMIDITÉ ET DES RÉGIMES MÉTÉOROLOGIQUES EN AFRIQUE CENTRALE ET ORIENTALE
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Anne Fornier
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Anne Fornier2019-02-19 12:12:172021-09-16 10:31:01VEI: COMMENT ÉVALUEZ-VOUS LA FORCE D’UNE ÉRUPTION ?
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Anne Fornier
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Anne Fornier2019-02-18 17:07:142021-09-16 10:26:57CAMPI FLEGREI, UNE BOMBE À RETARDEMENT
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1958
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Anne Fornier
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Anne Fornier2019-01-23 11:03:272021-09-16 10:20:37COMMENT NAÎT UN VOLCAN ? L’HISTOIRE DU PARICUTÍN
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Anne Fornier
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Anne Fornier2019-01-16 10:52:182021-09-16 10:18:57L’ETNA POURRAIT-ELLE PROVOQUER UN TSUNAMI ?
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Anne Fornier
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Anne Fornier2018-12-20 12:40:492021-09-16 10:15:17LA FERTILITÉ DES VOLCANS
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Anne Fornier
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Anne Fornier2018-12-20 11:56:112021-09-16 10:10:55CE QUE NOUS SAVONS DES VOLCANS SOUS-MARINS
Since 2021 VOLCANO ACTIVE FOUNDATION has been committed to the UN Global Compact corporate responsibility initiative and its principles in the areas of human rights, labour, the environment and anti-corruption.
Risque de catastrophe volcanique