Oscillations in hydrothermal systems as a source of periodic unrest at caldera volcanoes: Multiparameter insights from Nisyros, Greece
Identifieur interne : 000015 ( Istex/Corpus ); précédent : 000014; suivant : 000016Oscillations in hydrothermal systems as a source of periodic unrest at caldera volcanoes: Multiparameter insights from Nisyros, Greece
Auteurs : Joachim Gottsmann ; Roberto Carniel ; Nicolas Coppo ; Luke Wooller ; Stefanie Hautmann ; Hazel RymerSource :
- Geophysical Research Letters [ 0094-8276 ] ; 2007-04.
English descriptors
- KwdEn :
- Aqueous fluid migration, Average amplitudes, Bouguer density, Caldera, Caldera floor, Caldera unrest, Caldera volcanoes, Caliro, Campi flegrei, Campi flegrei caldera, Continuous gravity, Data sets, Degassing, Degassing process, Delay time, Discrete bursts, Dominant period, Dzurisin, Earth planet, Earth sciences, Electrical properties, Electromagnetic signal, Fluid flow, Fluid migration, Geophys, Geophysical, Geophysical signals, Geotherm, Gottsmann, Gravimetric, Gravimetric record, Gravity, Gravity changes, Gravity data, Gravity increase, Gravity record, Gravity variations, Ground deformation, Ground subsidence, Hydrothermal, Hydrothermal system, Hydrothermal systems, Lett, Many cases, Milton keynes, Multiparameter insights, Nisyros, Nisyros caldera, Nisyros island, Nisyros volcano, Open university, Oscillation, Periodic oscillation, Periodic oscillations, Periodic unrest, Phreatic crater, Poor satellite coverage, Power spectrum, Record displays, Residual gravity changes, Restless caldera, Restless calderas, Same location, Seismic, Seismic intensity, Seismic record, Shallow depth, Source depth, Subsurface dynamics, Teleseismic events, Unrest, Unrest periods, Upper geyser basin, Volcano, Volcano geodesy, Volcanol, Yellowstone caldera.
- Teeft :
- Aqueous fluid migration, Average amplitudes, Bouguer density, Caldera, Caldera floor, Caldera unrest, Caldera volcanoes, Caliro, Campi flegrei, Campi flegrei caldera, Continuous gravity, Data sets, Degassing, Degassing process, Delay time, Discrete bursts, Dominant period, Dzurisin, Earth planet, Earth sciences, Electrical properties, Electromagnetic signal, Fluid flow, Fluid migration, Geophys, Geophysical, Geophysical signals, Geotherm, Gottsmann, Gravimetric, Gravimetric record, Gravity, Gravity changes, Gravity data, Gravity increase, Gravity record, Gravity variations, Ground deformation, Ground subsidence, Hydrothermal, Hydrothermal system, Hydrothermal systems, Lett, Many cases, Milton keynes, Multiparameter insights, Nisyros, Nisyros caldera, Nisyros island, Nisyros volcano, Open university, Oscillation, Periodic oscillation, Periodic oscillations, Periodic unrest, Phreatic crater, Poor satellite coverage, Power spectrum, Record displays, Residual gravity changes, Restless caldera, Restless calderas, Same location, Seismic, Seismic intensity, Seismic record, Shallow depth, Source depth, Subsurface dynamics, Teleseismic events, Unrest, Unrest periods, Upper geyser basin, Volcano, Volcano geodesy, Volcanol, Yellowstone caldera.
Abstract
Unrest at collapse calderas is generally thought to be triggered by the arrival of new magma at shallow depth. But few unrest periods at calderas over the past decades have culminated in volcanic eruptions and the role of hydrothermal processes during unrest is drawing more and more attention. Here we report joint and simultaneous continuous multi‐parameter observations made at the restless Nisyros caldera (Greece), which reveal non‐steady short‐term oscillatory signals. The combined geodetic, gravimetric, seismic and electromagnetic records indicate that the oscillations are associated with thermohydromechanical disturbances of the hydrothermal system. The dominant period of oscillation (40–60 min) indicates short‐term processes most likely associated with instabilities in the degassing process. Amplitudes of recorded geodetic and gravimetric signals are comparable to amplitudes observed at other periodically restless calderas. We conclude that shallow aqueous fluid migration can contribute significantly to periodic unrest, explaining the lack of eruptions in many cases of unrest.
Url:
DOI: 10.1029/2007GL029594
Links to Exploration step
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<front><div type="abstract">Unrest at collapse calderas is generally thought to be triggered by the arrival of new magma at shallow depth. But few unrest periods at calderas over the past decades have culminated in volcanic eruptions and the role of hydrothermal processes during unrest is drawing more and more attention. Here we report joint and simultaneous continuous multi‐parameter observations made at the restless Nisyros caldera (Greece), which reveal non‐steady short‐term oscillatory signals. The combined geodetic, gravimetric, seismic and electromagnetic records indicate that the oscillations are associated with thermohydromechanical disturbances of the hydrothermal system. The dominant period of oscillation (40–60 min) indicates short‐term processes most likely associated with instabilities in the degassing process. Amplitudes of recorded geodetic and gravimetric signals are comparable to amplitudes observed at other periodically restless calderas. We conclude that shallow aqueous fluid migration can contribute significantly to periodic unrest, explaining the lack of eruptions in many cases of unrest.</div>
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