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Present-day deformation and kinematics of the active faults observed by GPS in the Zagros and east of Iran

Abstract : The convergence between the Arabian and the Eurasian plates is accommodated inside the Iranian territory. We have measured dense GPS networks covering wide parts of Iran (Zagros, Lut block and Kopeh Dagh) and present velocity fields with precisions better than 2 mm/yr.
In Zagros, convergence is accommodated by partitioning in the northern part with 2-4 mm/yr of right lateral strike-slip on the MRF. This motion is transferred to the Dena, Kazerun and Kareh Bas faults of the Kazerun fault system slipping each at 3-4 mm/yr. In Central Zagros, 8 mm/yr of NS shortening is concentrated mainly along the Persian Gulf shore while seismicity is more widely spread, evidencing decoupling of the surface deformation from the basement probably facilitated by the presence of Hormuz salt.
In eastern Iran, 14 mm/yr of right lateral NS shear between the Central Iranian Block and the Hellmand block is observed across the Lut block, with 6.5 mm/yr across its western limit (Bam, Gowk and Sabzevaran faults) and 7.5 mm/yr across its eastern limit (Sistan Suture zone). Major EW trending left lateral strike-slip faults absorb part of this shear at the northern limit of the Lut block (Dasht-e-Bayaz 1.5 mm/yr, Doruneh 2.5 mm/yr). 8 mm/yr remaining shear south of the Kopeh Dagh range is accommodated mainly by NS shortening across the Binalud and eastern Kopeh Dagh range (3.5 and 2.5 mm/yr), by right lateral strike-slip on the Quchan fault system (5 mm/yr) and westward expulsion of the South Caspian Basin (5-8 mm/yr).
Comparison of GPS present-day slip rates with short and long term geological estimates show complex slip evolution even in the context of young continental collision present in Iran.
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https://tel.archives-ouvertes.fr/tel-00285919
Contributor : Farokh Tavakoli <>
Submitted on : Friday, June 6, 2008 - 4:00:01 PM
Last modification on : Thursday, November 19, 2020 - 3:54:28 PM
Long-term archiving on: : Friday, May 28, 2010 - 7:09:18 PM

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  • HAL Id : tel-00285919, version 1

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Farokh Tavakoli. Present-day deformation and kinematics of the active faults observed by GPS in the Zagros and east of Iran. Geophysics [physics.geo-ph]. Université Joseph-Fourier - Grenoble I, 2007. English. ⟨tel-00285919⟩

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