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Preliminary magnetotelluric studies along the Hellenic Volcanic Arc: implications for the collision between the African plate and the ‘Aegea’ microplate

Identifieur interne : 000367 ( Main/Exploration ); précédent : 000366; suivant : 000368

Preliminary magnetotelluric studies along the Hellenic Volcanic Arc: implications for the collision between the African plate and the ‘Aegea’ microplate

Auteurs : D. Galanopoulos [Grèce]

Source :

RBID : ISTEX:506F558CAF2A7F7CD376E6E997A17886B08923FD

Descripteurs français

English descriptors

Abstract

Abstract: From Middle-Upper Miocene time to the present the African plate has subducted under the so-called ‘Aegea’ microplate. A prominent feature of this continental collision is the past and present volcanic activity along the Hellenic Volcanic Arc (HVA), which is sited 200 km behind the frontal compressional region. Since 1986, several magnetotelluric (MT) surveys have been undertaken along the HVA, and particularly on the islands of Milos, Kos and Nisyros to determine their subsurface electrical structure. The derived electrical models have indicated very low resistivities (less than 30 Ω m) for the uppermost 10 km, which have been related to known (i.e. Milos and Nisyros) or potential (i.e. Kos) geothermal anomalies. Evaluation of the existing electrical models and subsequent 1D modelling of the broadband MT data has revealed some deeper (greater than 10 km depth) electrical features of the lithosphere below the HVA. Study of the azimuths of the major axes of the rotated impedance ellipses and the Parkinson induction arrows in the period range 10+2–10+4 s has led to their association with the subduction and extensional processes taking place in the Aegean. The MT results are in agreement with the observed gravity values, magnetic anomalies and the results from geotectonic, deep seismic refraction and seismological studies. Finally, proposal for the future study of the deep electrical structure of the Aegean is presented.

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DOI: 10.1016/0031-9201(93)90128-V


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Le document en format XML

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<term>African Plate</term>
<term>African plate</term>
<term>Anomaly</term>
<term>Arrows show</term>
<term>Aseismic zone</term>
<term>Comninakis</term>
<term>Continental collision</term>
<term>Crete</term>
<term>Crust</term>
<term>Dawes</term>
<term>Deep earthquakes</term>
<term>Depth range</term>
<term>Depth values</term>
<term>Earth planet</term>
<term>Eastern mediterranean</term>
<term>Electrical features</term>
<term>Electrical interface</term>
<term>Electrical model</term>
<term>Electrical models</term>
<term>Electrical structure</term>
<term>Error bars show</term>
<term>Extensional</term>
<term>Extensional directions</term>
<term>Extensional processes</term>
<term>Frontal compressional region</term>
<term>Future study</term>
<term>Galanopoulos</term>
<term>Galanopoulos physics</term>
<term>Geographic location</term>
<term>Geophysical</term>
<term>Geophysical information</term>
<term>Geophysical investigations</term>
<term>Geophysical models</term>
<term>Geotectonic</term>
<term>Geotectonic evolution</term>
<term>Geothermal</term>
<term>Geothermal anomalies</term>
<term>Gravity values</term>
<term>Hellenic trench</term>
<term>Hellenides</term>
<term>Higher resistivities</term>
<term>Impedance ellipses</term>
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<term>Layer interface</term>
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<term>Lithosphere</term>
<term>Magnetic anomalies</term>
<term>Magnetotelluric</term>
<term>Main features</term>
<term>Major axes</term>
<term>Major axis</term>
<term>Milo</term>
<term>Miocene time</term>
<term>Misfit</term>
<term>Model parameters</term>
<term>Model resistivity</term>
<term>Modelling</term>
<term>Moho discontinuity</term>
<term>Nisyros</term>
<term>Other geophysical results</term>
<term>Papazachos</term>
<term>Parkinson induction arrows</term>
<term>Period range</term>
<term>Phase data</term>
<term>Phase responses</term>
<term>Planetary interiors</term>
<term>Relative motion</term>
<term>Resistivity</term>
<term>Seismic refractor</term>
<term>Seismological studies</term>
<term>Several microplates</term>
<term>Shallow earthquakes</term>
<term>Solid curves</term>
<term>Upper mantle</term>
<term>Volcanic activity</term>
<term>Volcanic islands</term>
<term>Volcanism</term>
<term>deep seismic sounding</term>
<term>digital simulation</term>
<term>extension tectonics</term>
<term>lithosphere</term>
<term>magnetotelluric surveys</term>
<term>microplates</term>
<term>middle Miocene</term>
<term>plate collision</term>
<term>refraction methods</term>
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<term>subduction</term>
<term>upper Miocene</term>
<term>volcanic arcs</term>
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<term>Arc volcanique</term>
<term>Collision plaque</term>
<term>Extension tectonique</term>
<term>Hellénides</term>
<term>Levé magnétotellurique</term>
<term>Lithosphère</term>
<term>Microplaque</term>
<term>Miocène moyen</term>
<term>Miocène sup</term>
<term>Modèle électrique</term>
<term>Plaque Africaine</term>
<term>Résistivité électrique</term>
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<term>Sismique réfraction</term>
<term>Sondage sismique profond</term>
<term>Subduction</term>
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<term>Aegean area</term>
<term>Aegean region</term>
<term>African plate</term>
<term>Anomaly</term>
<term>Arrows show</term>
<term>Aseismic zone</term>
<term>Comninakis</term>
<term>Continental collision</term>
<term>Crete</term>
<term>Crust</term>
<term>Dawes</term>
<term>Deep earthquakes</term>
<term>Depth range</term>
<term>Depth values</term>
<term>Earth planet</term>
<term>Eastern mediterranean</term>
<term>Electrical features</term>
<term>Electrical interface</term>
<term>Electrical model</term>
<term>Electrical models</term>
<term>Electrical structure</term>
<term>Error bars show</term>
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<term>Extensional directions</term>
<term>Extensional processes</term>
<term>Frontal compressional region</term>
<term>Future study</term>
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<term>Galanopoulos physics</term>
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<term>Geophysical</term>
<term>Geophysical information</term>
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<term>Higher resistivities</term>
<term>Impedance ellipses</term>
<term>Induction arrows</term>
<term>Lagios</term>
<term>Layer interface</term>
<term>Lesvos</term>
<term>Lithosphere</term>
<term>Magnetic anomalies</term>
<term>Magnetotelluric</term>
<term>Main features</term>
<term>Major axes</term>
<term>Major axis</term>
<term>Milo</term>
<term>Miocene time</term>
<term>Misfit</term>
<term>Model parameters</term>
<term>Model resistivity</term>
<term>Modelling</term>
<term>Moho discontinuity</term>
<term>Nisyros</term>
<term>Other geophysical results</term>
<term>Papazachos</term>
<term>Parkinson induction arrows</term>
<term>Period range</term>
<term>Phase data</term>
<term>Phase responses</term>
<term>Planetary interiors</term>
<term>Relative motion</term>
<term>Resistivity</term>
<term>Seismic refractor</term>
<term>Seismological studies</term>
<term>Several microplates</term>
<term>Shallow earthquakes</term>
<term>Solid curves</term>
<term>Upper mantle</term>
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<div type="abstract" xml:lang="en">Abstract: From Middle-Upper Miocene time to the present the African plate has subducted under the so-called ‘Aegea’ microplate. A prominent feature of this continental collision is the past and present volcanic activity along the Hellenic Volcanic Arc (HVA), which is sited 200 km behind the frontal compressional region. Since 1986, several magnetotelluric (MT) surveys have been undertaken along the HVA, and particularly on the islands of Milos, Kos and Nisyros to determine their subsurface electrical structure. The derived electrical models have indicated very low resistivities (less than 30 Ω m) for the uppermost 10 km, which have been related to known (i.e. Milos and Nisyros) or potential (i.e. Kos) geothermal anomalies. Evaluation of the existing electrical models and subsequent 1D modelling of the broadband MT data has revealed some deeper (greater than 10 km depth) electrical features of the lithosphere below the HVA. Study of the azimuths of the major axes of the rotated impedance ellipses and the Parkinson induction arrows in the period range 10+2–10+4 s has led to their association with the subduction and extensional processes taking place in the Aegean. The MT results are in agreement with the observed gravity values, magnetic anomalies and the results from geotectonic, deep seismic refraction and seismological studies. Finally, proposal for the future study of the deep electrical structure of the Aegean is presented.</div>
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