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The 2022 Hormozgan doublet earthquakes: Two blind thrusts-related folding in Zagros fold-and-thrust belt, Southeast Iran
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  • Yinghui Yang,
  • Xiaoyun Li,
  • Jyr-Ching Hu,
  • Jiawei Song,
  • Jingjing Zhao,
  • Ali Yassaghi,
  • Erwan Pathier,
  • Qiang Xu,
  • Qiang Chen
Yinghui Yang
Chengdu University of Technology

Corresponding Author:[email protected]

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Xiaoyun Li
Chengdu University of Technology
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Jyr-Ching Hu
National Taiwan University
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Jiawei Song
Chengdu University of Technology
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Jingjing Zhao
Southwest Jiaotong University
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Ali Yassaghi
Tarbiat Modares University
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Erwan Pathier
Univ. Grenoble Alpes
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Qiang Xu
Chengdu University of Technology
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Qiang Chen
Southwest Jiaotong University
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Abstract

A doublet earthquakes event including two main shocks with a magnitude larger than Mw 6.0 occurred on 1 July, 2022 in the Zagros fold-and-thrust belt, southeast Iran. The coseismic InSAR deformation field shows that this event caused significant surface uplift due to fault-related folding in the seismic zone. The estimated preferred faulting model suggests that a higher dip angle fault (maximum slip of ~1.1 m), and an overlying gentle dipping fault (maximum slip of ~1.2 m) within the Bandar-e-Lengeh Anticline, are responsible for the first and second main shocks, respectively. The calculated Coulomb failure stress change suggests that the first main shock has a significantly positive triggering effect in the second main shock. The coseismic deformation due to this doublet earthquakes is equal to the accumulated interseismic deformation for the past ~104 years. Finally, the salt diapir activity may affect the generation of the earthquake in the seismic zone.