TAILIEUCHUNG - Tectonic evolution of the central part of the East Anatolian Fault Zone, Eastern Turkey

The Eastern Anatolian Fault Zone (EAFZ), having a prominent place in the tectonic evolution of the Eastern Mediterranean, is a structural element of tectonic indentor due to the convergence between the African-Arabian plates and the Eurasian Plate. This study investigates the central part of EAFZ between Doğanyol (Malatya) and Çelikhan (Adıyaman). The geometry of the fault and the morphotectonic structures were determined by the field studies. Moreover, fault-slip data are measured according to the fault planes along the deformation zone for paleostress analysis. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2021 30 928-947 http earth TÜBİTAK Research Article doi yer-2104-15 Tectonic evolution of the central part of the East Anatolian Fault Zone Eastern Turkey Elif AKGÜN Murat İNCEÖZ Department of Geological Engineering Faculty of Engineering Fırat University Elazığ Turkey Received Accepted Published Online Final Version Abstract The Eastern Anatolian Fault Zone EAFZ having a prominent place in the tectonic evolution of the Eastern Mediterranean is a structural element of tectonic indentor due to the convergence between the African-Arabian plates and the Eurasian Plate. This study investigates the central part of EAFZ between Doğanyol Malatya and Çelikhan Adıyaman . The geometry of the fault and the morphotectonic structures were determined by the field studies. Moreover fault-slip data are measured according to the fault planes along the deformation zone for paleostress analysis. The paleostress analysis revealed three deformation phases that developed from the Late Eocene to the present due to the convergence between the Arabian Plate and the Anatolian Block. The first deformation phase is characterized by NW-SE compressional stress between Late Eocene and Late Oligocene periods. The second deformation phase is related to N-S compressional stress from the Middle Miocene to Pliocene. The most recent deformation phase shows the strike-slip faulting under the NNE-SSW compressional stress from the Late Pliocene to the present. The EAFZ developed during the last phase of these deformation stages. In addition elongated ridges parallel to the fault sinistral offsets of drainage networks linear valleys and fault terraces observed along the segment show that the study area exhibits active tectonic morphology of the EAFZ. The distribution of seismic activity that occurred during and after the recent mainshock 24 January 2020 Sivrice-Doğanyol earthquake is .

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