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    Analysis of Surface Fault-Rupture Characteristics Resulting from the 6 February 2023 (Mw:7.6) Ekinozu Earthquake along the Ciglik Fault (Malatya-Dogansehir-Eskikoy)
    (Afet ve Acil Durum Yonetimi Baskanligi (AFAD), 2024) Kocbulut, Fikret; Softa, Mustafa; Akgun, Elif; Kosaroglu, Sinan; Otlu, Nazmi
    In this study, we analyze the surface rupture caused by the Kahramanmaras/Ekinozu (Mw: 7.6) Earthquake of February 6, 2023, along the Eastern Anatolian Fault Zone. The rupture, observed between the Doǧansehir district and Eskikoy town in Malatya province, was mapped at a scale of 1/25000. Additionally, we investigate the deep continuation of the rupture and quantify the resulting deformation. Our aim is to determine the width of deformation and vertical displacements, providing insights into its complex features. In surface rupture studies, it was determined that (i) the approximately 11 km mapped surface rupture between Malatya province's Doǧansehir district and Eskikoy town aligns with the previously identified Ciglik fault, (ii) the deformation width of the surface rupture ranges from 3.4 meters to 8.3 meters, with the most significant left-lateral displacement observed near the town of Ciglik reaching 95 cm, concurrently with a vertical displacement of 75 cm. © 2024 Afet ve Acil Durum Yonetimi Baskanligi (AFAD). All rights reserved.
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    Effect on the Eastern Anatolian Fault Zone Erkenek and Pazarcik Segments of the 6 February 2023 Pazarcik (Kahramanmaras) Earthquake: Observations from Celikhan-Golbasi (Adiyaman)
    (Afet ve Acil Durum Yonetimi Baskanligi (AFAD), 2023) Aksoy, Ercan; Akgun, Elif; Softa, Mustafa; Kocbulut, Fikret; Sozbilir, Hasan; Tatar, Orhan; Erol, Serap Colak
    This study aims to evaluate on a regional scale the surface ruptures that developed on the segments forming the southern branch of the Eastern Anatolian Fault Zone (EAFZ), on 2023 February 6, based on the morphology and slip amounts determined by mapping at 1/25.000 scale. It has in sight that the left lateral displacement, which measured 2.90 m at Celikhan, reached 3.80 m towards Golbasi/Balkar along the surface rupture and increased as close to the location of the main shock. The surface rupture developing a narrow deformation zone in Celikhan forms an extensional deformation zone by stepping to the left towards Golbasi/Balkar locality. Due to this situation, small-scale pull-apart basins have developed in the area, where vertical offsets up to 60 cm are also measured. © 2023 Universite de Paris VI (Pierre et Marie Curie). All rights reserved.
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    Surface rupture during the 6th of February 2023 Mw 7.6 Elbistan-Ekinözü (Kahramanmaraş) earthquake: implications for fault rupture dynamics along the northern branch of East Anatolian Fault Zone
    (Tubitak Scientific & Technological Research Council Turkey, 2024) Softa, Mustafa; Kocbulut, Fikret; Akgun, Elif; Aksoy, Ercan; Sozbilir, Hasan; Tatar, Orhan; Karabacak, Volkan
    On the 6th of February 2023, Mw 7.7 Pazarcik (Kahramanmaras) and Mw 7.6 Ekinozu (Kahramanmaras) earthquakes that occurred in Turkiye are devastating earthquake series that filled the existing seismic gaps on East Anatolian Fault Zone on the same day. The first Mw 7.7 earthquake caught most people in their sleep and 9 h later, a second one was triggered, ending up with more than 50k death toll, widespread damage to buildings, and massive landslides. This study presents the surface rupture geometry and coseismic displacement characteristics determined with field observations immediately after February 6, 2023, Ekinozu (Kahramanmaras, Turkiye) earthquake (Mw 7.6). Preliminary implications show that the total rupture length is 130 +/- 10 km on the cardak segment and Dogansehir segment, known as the northern branch of the East Anatolian Fault Zone. Left lateral strike-slip faulting is developed with a maximum horizontal displacement of 6.60 m and an average displacement of 3.00 m. Furthermore, the pitches of slip lines ranging from 0 degrees to 10 degrees were measured on the neoformed fault planes. In addition to that, surface rupture exhibits restraining bends and releasing bends structure at small scales on the cardak segment. From this point on, our preliminary results signify that cardak and Dogansehir segments were consecutively broken in Mw 7.6 Ekinozu (Kahramanmaras) earthquake that traced between Goksun and Nurhak region and from there reached the Eskikoy regions. Furthermore, potential stress may be concentrated on not only the Surgu segment which is on the transfer fault between the northern branch and the southern branch of East Anatolian Fault Zone but also the west of the cardak segment and the northeast of the Dogansehir segment near Yesilyurt (Malatya).