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Distribution of the right-lateral strike-slip motion from the Main Recent Fault to the Kazerun Fault System (Zagros, Iran): Evidence from present-day GPS velocities

Farokh Tavakoli 1, 2 Andrea Walpersdorf 1 Christine Authemayou 3, 4 H. Nankali 2 Denis Hatzfeld 1 M. Tatar 5 Yahya Djamour 2 F. Nilforoushan 2 Nathalie Cotte 1
1 LGIT - Laboratoire de Géophysique Interne et Tectonophysique
2 NCC - National Cartographic Center [Iran]
3 CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement
4 Institut de Paléontologie et Géologie
5 IIEES - International Institute of Earthquake Engineering and Seismology [Tehran]
Abstract : GPS measurements across the Kazerun Fault System in the Zagros mountain belt provide first instantaneous velocities on the different segments. These results are closely consistent with the geological fault slip rates (over 150 ka), implying stable velocities over a longer period. The present-day strike-slip motion is distributed from the Main Recent Fault to the N-trending Kazerun Fault System along a preferential en-echelon fault zone included in a more distributed fan-shape fault pattern. The Hormuz salt decoupling layer cannot be the only cause of a sedimentary spreading because seismicity attests these faults are rooted in the basement. The Dena fault (3.7 mm/yr) transfers the MRF fault slip mainly to the Kazerun (3.6 mm/yr) and slightly to the High Zagros and Sabz Pushan faults (1.5 mm/yr), and the Kazerun fault further to the Kareh Bas fault (3.4 mm/yr). Total geological horizontal offsets associated with GPS slip rates help inferring precise fault slip onset ages. The successive onsets deduced by this approach imply that the right-lateral strike-slip activity of the MRF has propagated in time southeastward to the Dena segment, and then to the Kazerun segment and to the Kareh Bas fault.
keyword : GPS Iran Zagros fault slip rates
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https://hal-insu.archives-ouvertes.fr/insu-00372166
Contributor : Pascale Talour <>
Submitted on : Tuesday, March 31, 2009 - 2:29:53 PM
Last modification on : Thursday, November 19, 2020 - 3:54:28 PM

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Farokh Tavakoli, Andrea Walpersdorf, Christine Authemayou, H. Nankali, Denis Hatzfeld, et al.. Distribution of the right-lateral strike-slip motion from the Main Recent Fault to the Kazerun Fault System (Zagros, Iran): Evidence from present-day GPS velocities. Earth and Planetary Science Letters, Elsevier, 2008, 275 (3-4), pp.342 à 347. ⟨10.1016/j.epsl.2008.08.030⟩. ⟨insu-00372166⟩

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