Integrated geophysical study of the geothermal system in the southern part of Nisyros Island, Greece
Identifieur interne : 000333 ( Main/Exploration ); précédent : 000332; suivant : 000334Integrated geophysical study of the geothermal system in the southern part of Nisyros Island, Greece
Auteurs : E. Lagios [Grèce] ; G. Apostolopoulos [Grèce]Source :
- Journal of Applied Geophysics [ 0926-9851 ] ; 1995.
Descripteurs français
- Pascal (Inist)
- Champ géothermique, Ecoulement source, Energie géothermique, Enthalpie, Europe Sud, Faille, Flux chaleur, Grèce, Levé gravimétrique, Levé géophysique, Modèle 2 dimensions, Méthode magnétotellurique, Prospection géophysique, Réduction chimique, Réseau fracture, Réservoir géothermique, Saisie donnée, Source chaleur, Source écoulement, Système géothermique.
- Wicri :
- geographic : Grèce.
- topic : Géophysique.
English descriptors
- KwdEn :
- Anomaly, Anomaly values, Apostolopoulos, Apostolopoulos journal, Considerable density contrast, Contour interval, Corresponding features, Dawes, Eastern half, Edinburgh univ, Electrode polarization, Electromagnetic induction, Exact determination, Fault zone, Flat part, Flow source, Fluid circulation, Fluid circulation zone, Fluid motion, Geophysical, Geophysical prospecting, Geophysical studies, Geophysics, Geothermal, Geothermal field, Geothermal fluid circulation, Geothermal fluid circulation zone, Geothermal fluid circulation zones, Geothermal fluid circulation zones modelled, Geothermal power station, Geothermal system, Gravity, Gravity anomalies, Gravity anomaly, Gravity anomaly contours, Gravity measurements, Greece, Heat source, Inverse problem, Lagios, Local grid, Main faults, Maximum values, Nisyros, Nisyros island, Normal zone, Northwestern part, Potential difference, Resistivity, Resistivity sections, Same source, Source flow, Southern Europe, Southern part, Strike length, Survey area, Survey lines, Telluric lines, Zone, data acquisition, enthalpy, faults, fracture zones, geophysical surveys, geothermal energy, geothermal fields, geothermal reservoirs, geothermal systems, gravity surveys, heat flux, magnetotelluric methods, reduction, two-dimensional models.
- Teeft :
- Anomaly, Anomaly values, Apostolopoulos, Apostolopoulos journal, Considerable density contrast, Contour interval, Corresponding features, Dawes, Eastern half, Edinburgh univ, Electrode polarization, Electromagnetic induction, Exact determination, Fault zone, Flat part, Fluid circulation, Fluid circulation zone, Fluid motion, Geophysical, Geophysical studies, Geophysics, Geothermal, Geothermal field, Geothermal fluid circulation, Geothermal fluid circulation zone, Geothermal fluid circulation zones, Geothermal fluid circulation zones modelled, Geothermal power station, Geothermal system, Gravity, Gravity anomalies, Gravity anomaly, Gravity anomaly contours, Gravity measurements, Inverse problem, Lagios, Local grid, Main faults, Maximum values, Nisyros, Nisyros island, Normal zone, Northwestern part, Potential difference, Resistivity, Resistivity sections, Same source, Southern part, Strike length, Survey area, Survey lines, Telluric lines, Zone.
Abstract
Abstract: The study of the high-enthalpy geothermal field of Nisyros Island is of great importance, because of the planned construction of a geothermal power station. The purpose of the applied geophysical surveys — gravity, SP, VLF and audio-magnetotelluric — in southernmost Nisyros was to investigate the major and minor faulting zones which are geothermally active, i.e. whether geothermal fluid circulation occurs in these zones. The survey lines, four parallel traverses of about 1500 m length, were chosen to be almost transverse to the main faults of the area. The SP method was the main reconnaissance technique, with the VLF and gravity measurements correlating with the “SP model”. Previously proposed SP data acquisition and reduction techniques were used, followed by a 2-D interpretation of the SP map which apparently locates the position of the fracture zones (geothermally active). The SP and VLF anomalies are believed to be generated by the same source (subsurface flow of fluid, heat and ions). Hence, at the place of a vertical geothermal fluid circulation zone, the curve of SP dipole-like anomaly changes its behaviour and the curve of the VLF anomaly takes maximum values for the in-phase component and minimum values for the out-of-phase component. On the VLF map of the survey area, the zones detected with the SP interpretation coincide with the maximum values of the VLF in-phase component. The geothermal fluid circulation zones, detected by the SP method, appear to be well correlated with corresponding features derived from the gravity and the AMT surveys. In particular, the AMT soundings indicate two zones of geothermal fluid circulation instead of the one the SP method detected in the central part of the investigated area.
Url:
DOI: 10.1016/0926-9851(94)00054-R
Affiliations:
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Le document en format XML
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The purpose of the applied geophysical surveys — gravity, SP, VLF and audio-magnetotelluric — in southernmost Nisyros was to investigate the major and minor faulting zones which are geothermally active, i.e. whether geothermal fluid circulation occurs in these zones. The survey lines, four parallel traverses of about 1500 m length, were chosen to be almost transverse to the main faults of the area. The SP method was the main reconnaissance technique, with the VLF and gravity measurements correlating with the “SP model”. Previously proposed SP data acquisition and reduction techniques were used, followed by a 2-D interpretation of the SP map which apparently locates the position of the fracture zones (geothermally active). The SP and VLF anomalies are believed to be generated by the same source (subsurface flow of fluid, heat and ions). Hence, at the place of a vertical geothermal fluid circulation zone, the curve of SP dipole-like anomaly changes its behaviour and the curve of the VLF anomaly takes maximum values for the in-phase component and minimum values for the out-of-phase component. On the VLF map of the survey area, the zones detected with the SP interpretation coincide with the maximum values of the VLF in-phase component. The geothermal fluid circulation zones, detected by the SP method, appear to be well correlated with corresponding features derived from the gravity and the AMT surveys. In particular, the AMT soundings indicate two zones of geothermal fluid circulation instead of the one the SP method detected in the central part of the investigated area.</div></front></TEI><affiliations><list><country><li>Grèce</li></country><region><li>Attique (région)</li></region><settlement><li>Athènes</li></settlement></list><tree><country name="Grèce"><region name="Attique (région)"><name sortKey="Lagios, E" sort="Lagios, E" uniqKey="Lagios E" first="E." last="Lagios">E. Lagios</name></region><name sortKey="Apostolopoulos, G" sort="Apostolopoulos, G" uniqKey="Apostolopoulos G" first="G." last="Apostolopoulos">G. Apostolopoulos</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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