NissirosV1, Main, Exploration, bibRecord, 000159

On the interpretation of gravity variations in the presence of active hydrothermal systems: Insights from the Nisyros Caldera, Greece

Identifieur interne : 000159 ( Main/Exploration ); précédent : 000158; suivant : 000160

On the interpretation of gravity variations in the presence of active hydrothermal systems: Insights from the Nisyros Caldera, Greece

Auteurs : J. Gottsmann [Espagne] ; H. Rymer [Royaume-Uni] ; L. K. Wooller [Royaume-Uni]

Source :

Geophysical Research Letters [ 0094-8276 ] ; 2005-12.

RBID : ISTEX:95308CEE15508AB96F516F362DDB419AB83A30D2

Descripteurs français

Pascal (Inist)
- Amplitude, Caldeira, Couplage, Court terme, Dégazage, Echantillon référence, Gravimétrie, Gravité, Grèce, Interface, Interprétation, Levé, Longueur onde, Phénomène transitoire, Pression, Propagation, Surveillance, Série temporelle, Vapeur eau, Variation court terme, Volcan.
Wicri :
- geographic : Grèce.
- topic : Interprétation, Sciences de la terre, Université ouverte.

English descriptors

KwdEn :
- Active hydrothermal systems, Benchmark, Berrino, Caldera, Caldera floor, Caldera unrest, Caliro, Campi, Campi flegrei, Campi flegrei caldera, Degassing, Earth sciences, Elevation changes, Flegrei, Geophys, Gottsmann, Gravity, Gravity change time series, Gravity changes, Gravity variations, Greece, Ground deformation, Hydrothermal, Hydrothermal area, Magmatic, Mgal, Microgravity surveys, Milton keynes, Nisyros, Nisyros caldera, Open university, Residual, Residual gravity changes, Rymer, Sampling interval, Short term, Short term variation, Steam pockets, Stefanos crater, Time series, Volcanol, amplitude, calderas, coupling, degassing, gravimetry, interfaces, interpretation, monitoring, pressure, propagation, standard samples, surveys, transient phenomena, volcanoes, water vapor, wavelength.
Teeft :
- Active hydrothermal systems, Benchmark, Berrino, Caldera, Caldera floor, Caldera unrest, Caliro, Campi, Campi flegrei, Campi flegrei caldera, Degassing, Earth sciences, Elevation changes, Flegrei, Geophys, Gottsmann, Gravity, Gravity change time series, Gravity changes, Gravity variations, Ground deformation, Hydrothermal, Hydrothermal area, Magmatic, Mgal, Microgravity surveys, Milton keynes, Nisyros, Nisyros caldera, Open university, Residual, Residual gravity changes, Rymer, Sampling interval, Steam pockets, Stefanos crater, Time series, Volcanol.

Abstract

We report on short‐term (over tens of minutes) residual gravity changes recorded at the restless Nisyros caldera in Greece via a series of discrete measurements at benchmarks within or in proximity to a hydrothermal area located along the caldera floor. The obtained time series reveal sinusoidal gravity variations with amplitudes of up to 25 μGal and wavelengths of 40–50 min. Degassing of a magmatic source coupling into (shallow) hydrothermal systems including the ascent of steam pockets and transient pressure variations during steam/liquid interface propagation appear to be the most likely causative process for the observed short‐term variations. We assess standard protocols of microgravity surveys for hazard assessment in volcanic areas in the light of these findings and propose additional techniques, such as continuous gravimetry, for the discrimination of hydrothermal signals from deeper‐seated, i.e. magmatic, signals during gravity monitoring of restless volcanoes hosting active hydrothermal systems.

Url:

https://api.istex.fr/document/95308CEE15508AB96F516F362DDB419AB83A30D2/fulltext/pdf

DOI: 10.1029/2005GL024061

Affiliations:

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<front><div type="abstract">We report on short‐term (over tens of minutes) residual gravity changes recorded at the restless Nisyros caldera in Greece via a series of discrete measurements at benchmarks within or in proximity to a hydrothermal area located along the caldera floor. The obtained time series reveal sinusoidal gravity variations with amplitudes of up to 25 μGal and wavelengths of 40–50 min. Degassing of a magmatic source coupling into (shallow) hydrothermal systems including the ascent of steam pockets and transient pressure variations during steam/liquid interface propagation appear to be the most likely causative process for the observed short‐term variations. We assess standard protocols of microgravity surveys for hazard assessment in volcanic areas in the light of these findings and propose additional techniques, such as continuous gravimetry, for the discrimination of hydrothermal signals from deeper‐seated, i.e. magmatic, signals during gravity monitoring of restless volcanoes hosting active hydrothermal systems.</div>
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On the interpretation of gravity variations in the presence of active hydrothermal systems: Insights from the Nisyros Caldera, Greece

On the interpretation of gravity variations in the presence of active hydrothermal systems: Insights from the Nisyros Caldera, Greece

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

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