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Cinématique actuelle et dynamique de l'Iran : GPS et modélisation numérique

Abstract : This report is dedicated to the study of the present-day kinematic of the Arabia/Eurasia collision using the two GPS networks. The intra-continental deformation is also studied by 3D thermo-mechanical modeling of the Iranian lithosphere.
The first network covers the whole Iranian territory and allows us to precise the boundary conditions of the area and to quantify the convergence rate accommodated by the main Iranian structures. To do so, we estimated the Euler vectors of the Arabia and the Central Iranian Bloc. The second network is focused on the central Alborz region and is dedicated to the study of the deformation of a narrow mountain range. The contribution of the velocity field to the present-day tectonic are detailed, taking into account the geologic and seismotectonic data.
Then, the velocity field is analyzed to try to determine which of microplate or continuum descriptions can be applied to the Iranian deformation. In that aim, we have developed two thermo-mechanical models. The first one in 2.5 D simulates the oblique collision of the Zagros and takes into account the thermal perturbation of subduction of the Arabian mantle beneath the Iranian continent. We have also tested the partitioning of the convergence using a strike-slip fault north of the range. The second is a 3D model of the Iranian lithosphere. The boundary conditions are set up by the motion of Arabia relative to Eurasia determined by GPS. The large strike-slip faults are simulated using contact zones. Then, the obtained velocity field is compared to the GPS one.
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https://tel.archives-ouvertes.fr/tel-00004979
Contributor : Nathalie Pothier <>
Submitted on : Monday, February 23, 2004 - 11:40:14 AM
Last modification on : Monday, October 19, 2020 - 10:59:01 AM
Long-term archiving on: : Friday, April 2, 2010 - 8:44:44 PM

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  • HAL Id : tel-00004979, version 1

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Philippe Vernant. Cinématique actuelle et dynamique de l'Iran : GPS et modélisation numérique. Géophysique [physics.geo-ph]. Université Montpellier II - Sciences et Techniques du Languedoc, 2003. Français. ⟨tel-00004979⟩

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