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Étude de la variation de la direction et de l'intensité du champ géomagnétique en Espagne durant les deux derniers millénaires

Abstract : Directional and intensity data of the Earth's magnetic field (EMF) from 28 Spanish archeomagnetic sites have been obtained by Thellier method. A data compilation (from -1000 BC to 2000 AD) has been used to calculate the secular variation (SV) curve for the Iberian Peninsula, which presents the same characteristics than the French and German curves. The comparison with the SV for Japan and SW USA suggests that the characteristics of the SV in Western Europe have a local character. Our new intensity results together with previous data for Western Europe (between -100 and 2000 AD), have been treated by Bayesian modelling. The obtained curve indicate that the geomagnetic intensity remain more or less constant between the 1st and 4th centuries, and between the 13th and 15th centuries (mean values around 65 and 57 µT respectively), whereas an important decrease occurs during the last 5 centuries. Finally, the evolution of the EMF intensity during High Middle Ages remains uncertain.
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Submitted on : Monday, February 12, 2007 - 1:40:16 PM
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  • HAL Id : tel-00130481, version 1

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Miriam Gomez Paccard. Étude de la variation de la direction et de l'intensité du champ géomagnétique en Espagne durant les deux derniers millénaires. Géologie appliquée. Université Rennes 1, 2006. Français. ⟨tel-00130481⟩

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