Geochemical indicators of possible ongoing volcanic unrest at Nisyros Island (Greece)
Identifieur interne : 000190 ( Main/Exploration ); précédent : 000189; suivant : 000191Geochemical 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 ] ; 2002-08-15.
Descripteurs français
- Pascal (Inist)
- Activité hydrothermale, Analyse chimique, Condition pression température, Dioxyde carbone, Eruption, Fluide magmatique, Fumerolle, Gaz, Gaz hydrogène sulfuré, Gaz volcanique, Hydrogène, Ile Nisyros, Iles Egée Grèce, Monoxyde carbone, Méthane, Phénomène précurseur, Rapport chimique, Risque volcanique, Système hydrothermal, Volcanisme.
- Wicri :
English descriptors
- KwdEn :
- Analytical data, Chemical changes, Chiodini, Different separation temperatures, Eruption, Fluid geochemistry, Fracture opening, Fumaroles, Fumarolic, Fumarolic gases, Geochemical, Geochemical indicators, Geochemical model, Geochemistry, Geothermal wells, Greek Aegean Islands, High ratios, Historical hydrothermal eruptions, Historical reports, Historical times, Hydrothermal, Hydrothermal aquifer, Hydrothermal eruptions, Hydrothermal system, Hydrothermal systems, Kaminakia fumaroles, Last hydrothermal eruptions, Lesser antilles, Liquid phase, Lofos, Lofos dome area, Lofos dome fumaroles, Magmatic, Magmatic component, Magmatic fluids, Marini, Nisyros, Nisyros fumaroles, Nisyros hydrothermal system, Nisyros island, Nisyros volcano, P-T conditions, Polybotes megalos, Polybotes micros, Saline brines, Seismic crisis, Seismic shocks, Soluble gases, Stephanos fumaroles, Triangular diagram, Upper parts, Vapor phase, Volcanic, Volcanic surveillance, Volcanic unrest, West indies, White island, carbon dioxide, carbon monoxide, chemical analysis, chemical ratios, eruptions, fumaroles, gases, hydrogen, hydrogen sulfide gas, hydrothermal activity, methane, precursors, volcanic risk, volcanism.
- Teeft :
- Analytical data, Chemical changes, Chiodini, Different separation temperatures, Eruption, Fluid geochemistry, Fracture opening, Fumaroles, Fumarolic, Fumarolic gases, Geochemical, Geochemical indicators, Geochemical model, Geochemistry, Geothermal wells, High ratios, Historical hydrothermal eruptions, Historical reports, Historical times, Hydrothermal, Hydrothermal aquifer, Hydrothermal eruptions, Hydrothermal system, Hydrothermal systems, Kaminakia fumaroles, Last hydrothermal eruptions, Lesser antilles, Liquid phase, Lofos, Lofos dome area, Lofos dome fumaroles, Magmatic, Magmatic component, Magmatic fluids, Marini, Nisyros, Nisyros fumaroles, Nisyros hydrothermal system, Nisyros island, Nisyros volcano, Polybotes megalos, Polybotes micros, Saline brines, Seismic crisis, Seismic shocks, Soluble gases, Stephanos fumaroles, Triangular diagram, Upper parts, Vapor phase, Volcanic, Volcanic surveillance, Volcanic unrest, West indies, White island.
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.
Url:
DOI: 10.1029/2001GL014355
Affiliations:
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type="alt">GEOPHYSICAL RESEARCH LETTERS</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><biblScope unit="vol">29</biblScope><biblScope unit="issue">16</biblScope><biblScope unit="page" from="6-1">6-1</biblScope><biblScope unit="page" to="64">64</biblScope><biblScope unit="page-count">4</biblScope><date type="published" when="2002-08-15">2002-08-15</date></imprint><idno type="ISSN">0094-8276</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0094-8276</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Analytical data</term><term>Chemical changes</term><term>Chiodini</term><term>Different separation temperatures</term><term>Eruption</term><term>Fluid geochemistry</term><term>Fracture opening</term><term>Fumaroles</term><term>Fumarolic</term><term>Fumarolic gases</term><term>Geochemical</term><term>Geochemical indicators</term><term>Geochemical 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shocks</term><term>Soluble gases</term><term>Stephanos fumaroles</term><term>Triangular diagram</term><term>Upper parts</term><term>Vapor phase</term><term>Volcanic</term><term>Volcanic surveillance</term><term>Volcanic unrest</term><term>West indies</term><term>White island</term><term>carbon dioxide</term><term>carbon monoxide</term><term>chemical analysis</term><term>chemical ratios</term><term>eruptions</term><term>fumaroles</term><term>gases</term><term>hydrogen</term><term>hydrogen sulfide gas</term><term>hydrothermal activity</term><term>methane</term><term>precursors</term><term>volcanic risk</term><term>volcanism</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Activité hydrothermale</term><term>Analyse chimique</term><term>Condition pression température</term><term>Dioxyde carbone</term><term>Eruption</term><term>Fluide magmatique</term><term>Fumerolle</term><term>Gaz</term><term>Gaz hydrogène sulfuré</term><term>Gaz volcanique</term><term>Hydrogène</term><term>Ile Nisyros</term><term>Iles Egée Grèce</term><term>Monoxyde carbone</term><term>Méthane</term><term>Phénomène précurseur</term><term>Rapport chimique</term><term>Risque volcanique</term><term>Système hydrothermal</term><term>Volcanisme</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Analytical data</term><term>Chemical changes</term><term>Chiodini</term><term>Different separation temperatures</term><term>Eruption</term><term>Fluid geochemistry</term><term>Fracture opening</term><term>Fumaroles</term><term>Fumarolic</term><term>Fumarolic gases</term><term>Geochemical</term><term>Geochemical indicators</term><term>Geochemical model</term><term>Geochemistry</term><term>Geothermal wells</term><term>High ratios</term><term>Historical hydrothermal eruptions</term><term>Historical reports</term><term>Historical times</term><term>Hydrothermal</term><term>Hydrothermal aquifer</term><term>Hydrothermal eruptions</term><term>Hydrothermal 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xml:lang="fr"><term>Gaz</term><term>Géochimie</term><term>Hydrogène</term></keywords></textClass></profileDesc></teiHeader><front><div type="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.</div></front></TEI><affiliations><list><country><li>Italie</li><li>Suisse</li></country></list><tree><country name="Italie"><noRegion><name sortKey="Chiodini, Giovanni" sort="Chiodini, Giovanni" uniqKey="Chiodini G" first="Giovanni" last="Chiodini">Giovanni Chiodini</name></noRegion><name sortKey="Brombach, Tatjana" sort="Brombach, Tatjana" uniqKey="Brombach T" first="Tatjana" last="Brombach">Tatjana Brombach</name><name sortKey="Caliro, Stefano" sort="Caliro, Stefano" uniqKey="Caliro S" first="Stefano" last="Caliro">Stefano Caliro</name><name sortKey="Cardellini, Carlo" sort="Cardellini, Carlo" uniqKey="Cardellini C" first="Carlo" last="Cardellini">Carlo Cardellini</name><name sortKey="Marini, Luigi" sort="Marini, Luigi" uniqKey="Marini L" first="Luigi" last="Marini">Luigi Marini</name></country><country name="Suisse"><noRegion><name sortKey="Dietrich, Volker" sort="Dietrich, Volker" uniqKey="Dietrich V" first="Volker" last="Dietrich">Volker Dietrich</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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