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Strain rate tensor in Iran from a new GPS velocity field

Abstract : The aim of this paper is to determine the strain rate tensor (SRT) for the Iranian region. In this study, (1) we apply a method of computation of the SRT never used for the Iranian area and (2) we use a new GPS velocity field obtained from several previously published velocity fields. First, the method is described and tested on a synthetic case, which mimics the real Iranian case. The synthetic tests confirm that the method allows us to both retrieve high gradients of the strain rate field and reduce the effect of an erroneous velocity vector. Second, the method is applied to a real data set covering the Arabia-Eurasia collision zone in Iran.We particularly focus on the Zagros-Makran transition zone, the Central Iran region and the northernmost part of the Arabia-Eurasia collision zone (NW Iran-Caucasus-East Turkey).Whereas themain characteristics of the obtained SRT are consistent with known tectonic features, important new results are found in the Central Iran, with the strike-slip style along the Anar and Deshir faults, and the Zagros-Makran transition zone, with a north-south variation of the SRT along the Zendan-Minab-Palami fault system. We link these results to recent active tectonic studies.
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Submitted on : Thursday, November 25, 2021 - 7:36:20 AM
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Frédéric Masson, Maximilien Lehujeur, Yann Ziegler, Cécile Doubre. Strain rate tensor in Iran from a new GPS velocity field. Geophysical Journal International, Oxford University Press (OUP), 2014, 197, pp.10-21. ⟨10.1093/gji/ggt509⟩. ⟨hal-00967710⟩



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