Identification Of A Hidden Thermal Fissure In A Volcanic Terrain Using A Combination Of Hydrothermal Convection Indicators And Soil-Atmosphere Analysis

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Journal Article: Identification Of A Hidden Thermal Fissure In A Volcanic Terrain Using A Combination Of Hydrothermal Convection Indicators And Soil-Atmosphere Analysis

Abstract
Mapping and characterizing fracturing in a volcanic terrain is facilitated by the analysis of physical and chemical properties of soils. The parameters analyzed include the temperature at shallow depth, the spontaneous potential (SP), and the 4He, 44CO2, and 222Rn contents of soil gases, as measured in situ by mass spectrometry and α counter. This analysis allowed a distinction of deep fissures not accompanied by thermal loss, characterized by a negative SP anomaly and high He levels, and of a hidden fissure with thermal loss, characterized by a positive SP anomaly and high He, Rn, and CO2 levels. This fissure has no visible surface manifestations. This method of analysing the convective thermal transfer is useful when analysing fracturing in volcanic structures to estimate their eruptive potential.

Authors 
Maurice Aubert and Jean-Claude Baubron






Published Journal 
Journal of Volcanology and Geothermal Research, 1988



DOI 
Not Provided
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Citation

Maurice Aubert,Jean-Claude Baubron. 1988. Identification Of A Hidden Thermal Fissure In A Volcanic Terrain Using A Combination Of Hydrothermal Convection Indicators And Soil-Atmosphere Analysis. Journal of Volcanology and Geothermal Research. (!) .