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Active tectonics along the Sheladiz seismogenic fault in the Western Zagros fold-thrust belt, Kurdistan, Northern Iraq

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Abstract

This study attempts to present a clear case of seismic activity caused by the Quaternary reactivation of a seismogenic blind basement fault in the Sheladiz area. This area is located within the Western Zagros fold-thrust belt in the Kurdistan region of northern Iraq, near the north-eastern margin of the Arabian plate. Focal mechanisms of largest earthquakes were provided by the Harvard CMT and UK ISC bulletins. The Sheladiz fault is a NE-trending, nearly vertical to steeply dipping, seismically active left-lateral (sinistral) strike-slip blind basement fault that extends for more than 80 km with focal depths of 18–24 km, and passes transversely through major fold structures. This fault probably coincides with the continuation of Late Precambrian Kutchuk-Duhok and Sinjar-Herki transverse basement faults that forms the boundary between the Sinjar-Abdul Aziz and Deir Al Zor-Erbil transversal blocks in the study area. Left-lateral (sinistral) strike-slip movements along this basement fault may be related to the anticlockwise rotation of the Arabian plate with respect to the Eurasian plate. The stress inversion results indicate a predominant of N-S (05°/003°) oriented maximum compressive stress (σ1) in the Sheladiz area. This present-day dominant direction supports the active deformation rates along the Arabia‐Eurasia collision zone. Earthquakes in Kurdistan are mainly produced by the neotectonic reactivation of many seismically active blind basement faults that locally occur close to the surface as major faults or well-defined structural and topographic lineaments. The findings of the present study may offer more clues to predict where future earthquakes are most likely to occur.

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Acknowledgements

Earthquake datasets for this research freely available on-line at the catalogue website of the United States Geological Survey’s (USGS) Earthquake Hazards Program (www.earthquake.usgs.gov), the European–Mediterranean Seismological Centre (EMSC) (www.emsc-csem.org), the International Seismological Centre (ISC) in the UK (www.isc.ac.uk), the Harvard Global Centroid Moment Tensor (CMT) Project (www.globalcmt.org), the National Seismic Network of Turkey (DDA) (www.fdsn.org), and the Turkish BOUN KOERI Regional Earthquake (BKRE)—Tsunami Monitoring Centre (TMC) (www.koeri.boun.edu.tr). The Windows version (5.8.9) of the Tensor program (Win-Tensor) was used in this research to calculate the present-day tectonic stresses. This free and opeN-Source software (http://damiendelvaux.be/Tensor/WinTensor/win-tensor.html) was developed by Delvaux D, Sperner B (2003) New aspects of tectonic stress inversion with reference to the TENSOR program. In: Nieuwland DA (ed.) New insights into structural interpretation and modelling, Geological Society, London, Special Publications 212: 75–100.

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Doski, J.A.H. Active tectonics along the Sheladiz seismogenic fault in the Western Zagros fold-thrust belt, Kurdistan, Northern Iraq. Int J Earth Sci (Geol Rundsch) 110, 595–608 (2021). https://doi.org/10.1007/s00531-020-01973-y

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