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    24 January 2020 Sivrice-Elazig, Turkey earthquake: geotechnical evaluation and performance of structures
    (Springer, 2021) Sayin, Erkut; Yon, Burak; Onat, Onur; Gor, Mesut; Oncu, Mehmet Emin; Tugrul Tunc, Esra; Bakir, Dursun
    The January 24, 2020 Sivrice-Elazig (Mw = 6.8) earthquake occurred on the East Anatolian Fault zone. Main shock of this earthquake was occurred 20:55 at local time. The Peak Ground Acceleration was equal to 0.3 g at the epicenter (Sivrice district) of the earthquake. Even though the main shock was moderate, its effects on the structures were rather serious. The main shock caused significant damage and resulted in 41 casualties. 1540 buildings were damaged moderately, while 8519 buildings were damaged heavily and collapsed. This main shock effected four cities surrounded the epicenter due to its shallow earthquakes. The purpose of this paper is to summarize past and present seismic characteristics of the earthquake region. In addition, the aim of this paper is to summarize the seismotectonic of the region, the general characteristics of the earthquake and more specifically to report on the structural damage, and structural damage caused by the earthquake, observed during the site investigation. The damages were classified for reinforced concrete structures, masonry dwellings and non-residential structures. All distinguished earthquake induced failures and damages were discussed. Moreover, lessons learned were presented in this study.
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    Seismic Resistance and Performance Evaluation of Masonry Dwellings After the February 6, 2023, Kahramanmaraş Earthquake Sequence in Türkiye
    (World Scientific Publ Co Pte Ltd, 2024) Onat, Onur; Yon, Burak; Uslu, Ali; Oncu, Mehmet Emin; Varolgunes, Sadik; Karasin, Ibrahim Baran; Gor, Mesut
    On February 6, 2023, two catastrophic earthquakes occurred on the East Anatolian Fault. The earthquakes had magnitudes of Mw = 7.7 and 7.6 and struck Kahramanmara & scedil;-Pazarc & imath;k and Kahramanmara & scedil;-Elbistan, respectively. The Kahramanmara & scedil;-Pazarc & imath;k earthquake was triggered at 04:17 local time on the Dead Sea Fault (a branch of the East Anatolian Fault). The last earthquake on the addressed fault occurred about 500 years ago. The recorded peak ground acceleration (PGA) at the Pazarc & imath;k station reached 2.05g. In addition, the Pazarc & imath;k earthquake triggered two independent earthquakes, the Nurda & gbreve;& imath; and Islahiye earthquakes, which occurred 10 min later than the Pazarc & imath;k earthquake. However, the last earthquake, with its epicenter in Kahramanmara & scedil;-Elbistan, struck at 13:24 local time. The recorded PGA for the Elbistan earthquake is 0.68g. This study aims to present the fault rupture mechanism of the February 6, 2023, Kahramanmara & scedil; earthquakes, earthquake characteristics, and to evaluate the performance of masonry dwellings during the Kahramanmara & scedil; earthquake doublet, which affected 10 provinces and numerous towns and villages. This paper also aims to illustrate the damage and failure mechanisms of the masonry dwellings, despite unexpectedly high accelerations that exceeded the design spectrum in the field, specifically in Kahramanmara & scedil;, Gaziantep, Hatay, and Malatya, according to the current earthquake code in use.