Magnetotelluric measurements on the Methana Peninsula (Greece): modelling and interpretation
Identifieur interne : 000248 ( Main/Exploration ); précédent : 000247; suivant : 000249Magnetotelluric measurements on the Methana Peninsula (Greece): modelling and interpretation
Auteurs : Theodora K. Volti [Royaume-Uni]Source :
- Tectonophysics [ 0040-1951 ] ; 1999.
English descriptors
- KwdEn :
- Aegean region, Anomaly, Apparent resistivities, Apparent resistivity, Arrows point, Azimuth, Base sites, Carbonate, Carbonate rocks, Central magma chamber, Central part, Conductivity anomaly, Cretaceous, Cretaceous carbonates, Dawes, Deep structure, Deeper structure, Different periods, Earth planet, Edinburgh, Edinburgh university, Electrical conductivity, Elsevier science, Final report, Former magmatic activity, Galanopoulos, Geological mapping, Geophys, Geophysical, Geophysical investigations, Geophysical survey, Geothermal, Geothermal exploration, Graben, Great depths, Hellenic trench, Iapetus suture zone, Ideal model, Igme, Imaginary arrows, Induction arrows, Inversion, Inverted sites, Jurassic ophiolites, Lagios, Lower resistivities, Magma, Magnetotelluric, Magnetotelluric data, Magnetotelluric impedance tensor, Magnetotelluric survey, Magnetotelluric system, Methana, Methana peninsula, Milo, Mineralogical exploration, Minimum structure, Mode data, Nisyros, Pantokrator limestones, Parkinson arrows, Parkinson arrows averages, Period range, Phase data, Pliocene extensional tectonics, Present model, Program inv2d, Project meth1, Quaternary, Real arrows, Recent eruption, Regional azimuth, Regional geology, Regional strike, Remote site, Resistivity, Resistivity data, Resistivity distribution, Resistivity values, Shallow structure, Short periods, Skin depth, Small intrusion, Small magma chamber, Smoothness constraint, Southern aegean, Static shift parameters, Strike direction, Such cases, Supply magma, Tectonophysics, Thermal springs, Thick lines, Thin lines, Triassic, Triassic carbonates, Trizina, Trizina area, Trizina graben, Volcanic, Volcanic activity, Volcanic history, Volcanic rocks, Volcanics, Volti, Volti tectonophysics, Ysch.
- Teeft :
- Aegean region, Anomaly, Apparent resistivities, Apparent resistivity, Arrows point, Azimuth, Base sites, Carbonate, Carbonate rocks, Central magma chamber, Central part, Conductivity anomaly, Cretaceous, Cretaceous carbonates, Dawes, Deep structure, Deeper structure, Different periods, Earth planet, Edinburgh, Edinburgh university, Electrical conductivity, Elsevier science, Final report, Former magmatic activity, Galanopoulos, Geological mapping, Geophys, Geophysical, Geophysical investigations, Geophysical survey, Geothermal, Geothermal exploration, Graben, Great depths, Hellenic trench, Iapetus suture zone, Ideal model, Igme, Imaginary arrows, Induction arrows, Inversion, Inverted sites, Jurassic ophiolites, Lagios, Lower resistivities, Magma, Magnetotelluric, Magnetotelluric data, Magnetotelluric impedance tensor, Magnetotelluric survey, Magnetotelluric system, Methana, Methana peninsula, Milo, Mineralogical exploration, Minimum structure, Mode data, Nisyros, Pantokrator limestones, Parkinson arrows, Parkinson arrows averages, Period range, Phase data, Pliocene extensional tectonics, Present model, Program inv2d, Project meth1, Quaternary, Real arrows, Recent eruption, Regional azimuth, Regional geology, Regional strike, Remote site, Resistivity, Resistivity data, Resistivity distribution, Resistivity values, Shallow structure, Short periods, Skin depth, Small intrusion, Small magma chamber, Smoothness constraint, Southern aegean, Static shift parameters, Strike direction, Such cases, Supply magma, Tectonophysics, Thermal springs, Thick lines, Thin lines, Triassic, Triassic carbonates, Trizina, Trizina area, Trizina graben, Volcanic, Volcanic activity, Volcanic history, Volcanic rocks, Volcanics, Volti, Volti tectonophysics, Ysch.
Abstract
Abstract: As a first deep geophysical survey, thirteen magnetotelluric and magnetovariation soundings in the period range of 0.0085–6000 s have been carried out in the Methana Peninsula and Trizina area (Greece), which form the western part of the active Hellenic Volcanic Arc. Data have been processed using robust techniques and further analysed using decomposition methods in order to find the regional azimuth. By using the smooth inverse of Smith and Booker (J. Geophys. Res. 96, 3905–3922, 1991), the 2-D modelling has resolved a low-resistivity area (<30 Ωm) at depths of 2–3 km beneath the volcanics, whereas elsewhere the resistivity is much higher (>100 Ωm). Parkinson induction arrows also at the range 0.01–0.1 s point towards the centre of the peninsula. The conductivity anomaly is interpreted as being connected with the volcanic history of Methana, as a cooler remnant of former magmatic activity. The contrast with the much higher resistivities suggested at depths >5 km, is discussed in terms of fluid mobility, limitation of the MT method and extensional processes in the southern Aegean.
Url:
DOI: 10.1016/S0040-1951(98)00218-2
Affiliations:
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Volti</name><affiliation wicri:level="4"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Geology and Geophysics, The University of Edinburgh, West Mains Rd., Edinburgh EH9 3JW</wicri:regionArea><orgName type="university">Université d'Édimbourg</orgName><placeName><settlement type="city">Édimbourg</settlement><region type="country">Écosse</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Tectonophysics</title><title level="j" type="abbrev">TECTO</title><idno type="ISSN">0040-1951</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1999">1999</date><biblScope unit="volume">301</biblScope><biblScope unit="issue">1–2</biblScope><biblScope unit="page" from="111">111</biblScope><biblScope unit="page" to="132">132</biblScope></imprint><idno type="ISSN">0040-1951</idno></series></biblStruct></sourceDesc><seriesStmt><idno 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survey</term><term>Geothermal</term><term>Geothermal exploration</term><term>Graben</term><term>Great depths</term><term>Hellenic trench</term><term>Iapetus suture zone</term><term>Ideal model</term><term>Igme</term><term>Imaginary arrows</term><term>Induction arrows</term><term>Inversion</term><term>Inverted sites</term><term>Jurassic ophiolites</term><term>Lagios</term><term>Lower resistivities</term><term>Magma</term><term>Magnetotelluric</term><term>Magnetotelluric data</term><term>Magnetotelluric impedance tensor</term><term>Magnetotelluric survey</term><term>Magnetotelluric system</term><term>Methana</term><term>Methana peninsula</term><term>Milo</term><term>Mineralogical exploration</term><term>Minimum structure</term><term>Mode data</term><term>Nisyros</term><term>Pantokrator limestones</term><term>Parkinson arrows</term><term>Parkinson arrows averages</term><term>Period range</term><term>Phase data</term><term>Pliocene extensional tectonics</term><term>Present model</term><term>Program inv2d</term><term>Project meth1</term><term>Quaternary</term><term>Real arrows</term><term>Recent eruption</term><term>Regional azimuth</term><term>Regional geology</term><term>Regional strike</term><term>Remote site</term><term>Resistivity</term><term>Resistivity data</term><term>Resistivity distribution</term><term>Resistivity values</term><term>Shallow structure</term><term>Short periods</term><term>Skin depth</term><term>Small intrusion</term><term>Small magma chamber</term><term>Smoothness constraint</term><term>Southern aegean</term><term>Static shift parameters</term><term>Strike direction</term><term>Such cases</term><term>Supply magma</term><term>Tectonophysics</term><term>Thermal springs</term><term>Thick lines</term><term>Thin lines</term><term>Triassic</term><term>Triassic carbonates</term><term>Trizina</term><term>Trizina area</term><term>Trizina graben</term><term>Volcanic</term><term>Volcanic activity</term><term>Volcanic history</term><term>Volcanic rocks</term><term>Volcanics</term><term>Volti</term><term>Volti tectonophysics</term><term>Ysch</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Aegean region</term><term>Anomaly</term><term>Apparent resistivities</term><term>Apparent resistivity</term><term>Arrows point</term><term>Azimuth</term><term>Base sites</term><term>Carbonate</term><term>Carbonate rocks</term><term>Central magma chamber</term><term>Central part</term><term>Conductivity anomaly</term><term>Cretaceous</term><term>Cretaceous carbonates</term><term>Dawes</term><term>Deep structure</term><term>Deeper structure</term><term>Different periods</term><term>Earth planet</term><term>Edinburgh</term><term>Edinburgh university</term><term>Electrical conductivity</term><term>Elsevier science</term><term>Final report</term><term>Former magmatic activity</term><term>Galanopoulos</term><term>Geological mapping</term><term>Geophys</term><term>Geophysical</term><term>Geophysical investigations</term><term>Geophysical survey</term><term>Geothermal</term><term>Geothermal exploration</term><term>Graben</term><term>Great depths</term><term>Hellenic trench</term><term>Iapetus suture zone</term><term>Ideal model</term><term>Igme</term><term>Imaginary arrows</term><term>Induction arrows</term><term>Inversion</term><term>Inverted sites</term><term>Jurassic ophiolites</term><term>Lagios</term><term>Lower resistivities</term><term>Magma</term><term>Magnetotelluric</term><term>Magnetotelluric data</term><term>Magnetotelluric impedance tensor</term><term>Magnetotelluric survey</term><term>Magnetotelluric system</term><term>Methana</term><term>Methana peninsula</term><term>Milo</term><term>Mineralogical exploration</term><term>Minimum structure</term><term>Mode data</term><term>Nisyros</term><term>Pantokrator limestones</term><term>Parkinson arrows</term><term>Parkinson arrows averages</term><term>Period range</term><term>Phase data</term><term>Pliocene extensional tectonics</term><term>Present model</term><term>Program inv2d</term><term>Project meth1</term><term>Quaternary</term><term>Real arrows</term><term>Recent eruption</term><term>Regional azimuth</term><term>Regional geology</term><term>Regional strike</term><term>Remote site</term><term>Resistivity</term><term>Resistivity data</term><term>Resistivity distribution</term><term>Resistivity values</term><term>Shallow structure</term><term>Short periods</term><term>Skin depth</term><term>Small intrusion</term><term>Small magma chamber</term><term>Smoothness constraint</term><term>Southern aegean</term><term>Static shift parameters</term><term>Strike direction</term><term>Such cases</term><term>Supply magma</term><term>Tectonophysics</term><term>Thermal springs</term><term>Thick lines</term><term>Thin lines</term><term>Triassic</term><term>Triassic carbonates</term><term>Trizina</term><term>Trizina area</term><term>Trizina graben</term><term>Volcanic</term><term>Volcanic activity</term><term>Volcanic history</term><term>Volcanic rocks</term><term>Volcanics</term><term>Volti</term><term>Volti tectonophysics</term><term>Ysch</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: As a first deep geophysical survey, thirteen magnetotelluric and magnetovariation soundings in the period range of 0.0085–6000 s have been carried out in the Methana Peninsula and Trizina area (Greece), which form the western part of the active Hellenic Volcanic Arc. Data have been processed using robust techniques and further analysed using decomposition methods in order to find the regional azimuth. By using the smooth inverse of Smith and Booker (J. Geophys. Res. 96, 3905–3922, 1991), the 2-D modelling has resolved a low-resistivity area (<30 Ωm) at depths of 2–3 km beneath the volcanics, whereas elsewhere the resistivity is much higher (>100 Ωm). Parkinson induction arrows also at the range 0.01–0.1 s point towards the centre of the peninsula. The conductivity anomaly is interpreted as being connected with the volcanic history of Methana, as a cooler remnant of former magmatic activity. The contrast with the much higher resistivities suggested at depths >5 km, is discussed in terms of fluid mobility, limitation of the MT method and extensional processes in the southern Aegean.</div></front></TEI><affiliations><list><country><li>Royaume-Uni</li></country><region><li>Écosse</li></region><settlement><li>Édimbourg</li></settlement><orgName><li>Université d'Édimbourg</li></orgName></list><tree><country name="Royaume-Uni"><region name="Écosse"><name sortKey="Volti, Theodora K" sort="Volti, Theodora K" uniqKey="Volti T" first="Theodora K" last="Volti">Theodora K. Volti</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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