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Journal of the Geological Society; 1991; v. 148; issue.3; p. 571-576;
DOI: 10.1144/gsjgs.148.3.0571
© 1991 Geological Society of London

Article

Soil gas emanations as precursory indicators of volcanic eruptions

J.-C. BAUBRON1, P. ALLARD2,3, J.-C. SABROUX2,4, D. TEDESCO2,3 & J.-P. TOUTALN3,5

1 Bureau de Recherches Géologiques et Minières, SGN/GCH, 45060 Orlkans Cedex 02, France
2 Centre des Faibles Radioactivités, CNRS-CEA, 91198 Gif sur Yvette Cedex, France
3 Ossentatorio Vesuviano, 249 Via A. Manzoni, 80123 Napoli, Italy
4 Volcanological Survey of Indonesia, Jalan Diponegoro 57, Bandung 40122, Indonesia
5 Observatoire Volcanologique du Piton de la Fournaise, ZPG, 97418 Plaine des Cafres, France

Field measurements conducted on several active volcanoes in Italy, the Lesser Antilles, and Indonesia demonstrate the common Occurrence of diffuse soil gas emanations from the volcanic piles, at distances from active craters or fumarolic zones. These emanations consist essentially of carbon dioxide and rare gases and their genetic link with crater fumaroles and/or magma degassing at depth can be verified both chemically and isotopically. We emphasize here the potential use of these fluids for continuous volcano monitoring and eruption forecasting.




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