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      The seismogenic fault system of the 2017 <i>M</i><sub>w</sub> 7.3 Iran–Iraq earthquake: constraints from surface and subsurface data, cross-section balancing, and restoration

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          Abstract

          <p><strong>Abstract.</strong> The 2017 <i>M</i><sub>w</sub> 7.3 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) the coexistence of thin- and thick-skinned thrusting, (ii) the reactivation of inherited structures, and (iii) the occurrence of weak units promoting heterogeneous deformation within the palaeo-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<span class="thinspace"></span>km, which is required for an <i>M</i><sub>w</sub> 7.3 earthquake.</p>

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          Most cited references 53

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          Balanced cross sections

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            Towards a paleogeography and tectonic evolution of Iran

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              Present-day crustal deformation and plate kinematics in the Middle East constrained by GPS measurements in Iran and northern Oman

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                Author and article information

                Journal
                Solid Earth
                Solid Earth
                Copernicus GmbH
                1869-9529
                2018
                June 20 2018
                : 9
                : 3
                : 821-831
                Article
                10.5194/se-9-821-2018
                © 2018

                https://creativecommons.org/licenses/by/4.0/

                Product
                Self URI (article page): https://www.solid-earth.net/9/821/2018/

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