Seismic Response of Saturated Soils in Gölbaşı District of Adıyaman Province to February 06, 2023 Kahramanmaraş Earthquake

On February 6, 2023, two major earthquakes with magnitudes Mw = 7.8 and Mw = 7.6 occurred along the Eastern Anatolian Fault at nine-hour intervals caused wide-spread damage in 11 provinces Hatay, Kahramanmaraş, Adıyaman, Malatya, Gaziantep, Elazığ, Osmaniye, Şanlıurfa, Diyarbakır, Kilis and Adana. In this study, soil liquefaction, which was extensively observed in Gölbaşı District of Adıyaman Province, is examined specifically in the context of the 6 February Kahramanmaraş (Mw=7.8) Earthquake records. As a result of the observations made in the field immediately after the earthquake, eleven microtremor recordings and five boreholes were drilled, and soil samples were recovered. Laboratory tests were carried out on these samples to determine basic soil characteristics. In addition, data from a comprehensive ground survey conducted by Iller Bank in 2006 were evaluated. As a result of the analysis of the data, one-dimensional dynamic soil behavior analyses were carried out on the established ground model considered to represent soil profiles with clayey sand layers. The non-linear behavior of the soil and the development of excess pore water pressure were taken into account. In the analyses using Pazarcık TK 4615 Station data, it was determined that the clayey sand layers liquefied, and this finding was compatible with the observations made in the field following the earthquake. Another result of the study was that due to the loss of stiffness and strength due to cyclic shear stresses and induced excess pore water pressure, attenuation instead of amplification occurred in the soil profile, which in turn increased the deformations.