Geochemical indicators of possible ongoing volcanic unrest at Nisyros Island (Greece)
Identifieur interne : 000004 ( PascalFrancis/Curation ); précédent : 000003; suivant : 000005Geochemical indicators of possible ongoing volcanic unrest at Nisyros Island (Greece)
Auteurs : Giovanni Chiodini [Italie] ; Tatjana Brombach [Italie] ; Stefano Caliro [Italie] ; Carlo Cardellini [Italie] ; Luigi Marini [Italie] ; Volker Dietrich [Suisse]Source :
- Geophysical research letters [ 0094-8276 ] ; 2002.
Descripteurs français
- Pascal (Inist)
- Iles Egée Grèce, Gaz, Volcanisme, Analyse chimique, Fumerolle, Dioxyde carbone, Gaz hydrogène sulfuré, Rapport chimique, Méthane, Activité hydrothermale, Hydrogène, Monoxyde carbone, Condition pression température, Risque volcanique, Eruption, Phénomène précurseur, Ile Nisyros, Gaz volcanique, Fluide magmatique, Système hydrothermal.
- Wicri :
English descriptors
- KwdEn :
Abstract
Significant changes occurred in the chemistry of gases discharged from Nisyros fumaroles in the years, 1997-2001, following a strong seismic crisis. Increasing H2S/CO2 ratios and decreasing CH4/CO2 ratios are attributed to an increased contribution of magmatic fluids to the hydrothermal system. Some fumaroles showed concurrent increases in H2 and CO contents implying increases in temperature and pressure in the upper parts of the hydrothermal system. These changes reinforce the possibility of an increased hazard of hydrothermal eruptions at present with respect to the '90's. Moreover, both the present events and the historical hydrothermal eruptions may represent precursory signals of a new period of volcanic unrest at Nisyros.
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<term>carbon monoxide</term>
<term>chemical analysis</term>
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<term>eruptions</term>
<term>fumaroles</term>
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<term>Condition pression température</term>
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<front><div type="abstract" xml:lang="en">Significant changes occurred in the chemistry of gases discharged from Nisyros fumaroles in the years, 1997-2001, following a strong seismic crisis. Increasing H<sub>2</sub>
S/CO<sub>2</sub>
ratios and decreasing CH<sub>4</sub>
/CO<sub>2</sub>
ratios are attributed to an increased contribution of magmatic fluids to the hydrothermal system. Some fumaroles showed concurrent increases in H<sub>2</sub>
and CO contents implying increases in temperature and pressure in the upper parts of the hydrothermal system. These changes reinforce the possibility of an increased hazard of hydrothermal eruptions at present with respect to the '90's. Moreover, both the present events and the historical hydrothermal eruptions may represent precursory signals of a new period of volcanic unrest at Nisyros.</div>
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S/CO<sub>2</sub>
ratios and decreasing CH<sub>4</sub>
/CO<sub>2</sub>
ratios are attributed to an increased contribution of magmatic fluids to the hydrothermal system. Some fumaroles showed concurrent increases in H<sub>2</sub>
and CO contents implying increases in temperature and pressure in the upper parts of the hydrothermal system. These changes reinforce the possibility of an increased hazard of hydrothermal eruptions at present with respect to the '90's. Moreover, both the present events and the historical hydrothermal eruptions may represent precursory signals of a new period of volcanic unrest at Nisyros.</s0>
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