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https://doi.org/10.5194/se-2018-21
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
19 Mar 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).
The seismogenic fault system of the 2017 Mw 7.3 Iran-Iraq earthquake: constraints from surface and subsurface data, cross-section balancing and restoration
Stefano Tavani1, Mariano Parente1, Francesco Puzone1, Amerigo Corradetti1, Gholamreza Gharabeigli2, Mehdi Valinejad2, Davoud Morsalnejad2, and Stefano Mazzoli1 1DISTAR. Università degli Studi di Napoli Federico II. Napoli, Italy
2N.I.O.C., Tehran, Iran
Abstract. The 2017 Mw Iran-Iraq earthquake occurred in a region where the pattern of major plate convergence is well constrained, but limited information is available on the seismogenic structures. Geological observations, interpretation of seismic reflection profiles, and well data are used in this paper to build a regional balanced cross-section that provides a comprehensive picture of the geometry and dimensional parameters of active faults in the hypocentral area. Our results indicate: (i) coexistence of thin- and thick-skinned thrusting, (ii) reactivation of inherited structures, and (iii) occurrence of weak units promoting heterogeneous deformation within the Paleo-Cenozoic sedimentary cover and partial decoupling from the underlying basement. According to our study, the main shock of the November 2017 seismic sequence is located within the basement, along the low-angle Mountain Front Fault. Aftershocks unzipped the up-dip portion of the same fault. This merges with a detachment level located at the base of the Paleozoic succession, to form a crustal-scale fault-bend anticline. Size and geometry of the Mountain Front Fault are consistent with a down-dip rupture width of 30 km, which is required for an Mw 7.3 earthquake.
Citation: Tavani, S., Parente, M., Puzone, F., Corradetti, A., Gharabeigli, G., Valinejad, M., Morsalnejad, D., and Mazzoli, S.: The seismogenic fault system of the 2017 Mw 7.3 Iran-Iraq earthquake: constraints from surface and subsurface data, cross-section balancing and restoration, Solid Earth Discuss., https://doi.org/10.5194/se-2018-21, in review, 2018.
Stefano Tavani et al.
Stefano Tavani et al.
Stefano Tavani et al.

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Short summary
A balanced cross section across the hypocentre of the 2017 Iran-Iraq 7.3 Mw earthquake is presented. The structural style of the area is characterised by inversion tectonics with partial decoupling between the basement and the 10 km thick sedimentary cover. The main shock is located along a low-dipping lateral ramp of the Mountain Front Fault. The balanced cross section indicates that the Mountain Front Fault is the only fault where an 7.3 Mw earthquake may occur.
A balanced cross section across the hypocentre of the 2017 Iran-Iraq 7.3 Mw earthquake is...
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