The damage assessment of masonry structures and engineering seismology studies (19-22 November 2021 Koprukoy earthquakes (Mw 5.1 and Mw 4.7) in Erzurum, Turkey)

The main purpose of this paper is to present the damage features of masonry structures and engineering seismology studies after the 19-22 November 2021 Koprukoy earthquakes (Mw 5.1 and Mw 4.7). The masonry structures damaged near the epicenter have been examined. Damages have been detected that such as vertical cracks in the walls of the masonry structures, out-of-plane bending of the walls, splits in the joints of the walls, and separation of the floors from the elements such as walls and roofs. The fact that the structures in the region do not receive an engineering service and that they are constructed without complying with the relevant earthquake regulations are thought to cause such damage. The damage in Topcu village of Koprukoy district in Erzurum is more than in other settlements. Microtremor measurements have been applied in Topcu Village to investigate dynamic soil features. The soil amplification factor and soil predominant period have been obtained similar to 6.8 and similar to 1.3 s for the first measurement and similar to 9.4 and similar to 1.3 s for second location, respectively. Also, Vs30, bedrock depth, vulnerability index, and shear strain parameters have been calculated using some empirical relations. High bedrock depth and low Vs30 values are obtained for both measurements. The vulnerability index and shear strain values also indicate that the vulnerability of the soil is high. In order to remain in the safe zone for structures in a possible future earthquake, it has been suggested that it should comply with the earthquake-soil-structure relationship and should be designed in accordance with the earthquake regulation standard.