According to the Turkish disaster and emergency management presidency (AFAD), an earthquake with a magnitude of Mw 7.7 occurred, affecting the large area located on the East Anatolian Fault zone on February 6, 2023, at 1.17 GMT. The triggered mainshock with a magnitude of Mw 7.6 occurred 9 h after the first mainshock. Another that, large mainshock with a magnitude of Mw 6.4 occurred on February 20, 2023, in Defne-Antakya. The first mainshock lasted 100 s, and the triggered second and third mainshocks were 60 and 45 s, respectively. The observed length of the fault on the ground surface was approximately 567 km after the mainshock. Acceleration values at some strong motion stations were measured at over 1000 gal due to the near-fault effect. The long duration of high acceleration motion caused ground deformations developed by liquefaction. Liquefaction occurred along the shoreline of Iskenderun City in Hatay province. The fishing port moved through the Mediterranean Sea due to lateral spreading. Some buildings tilted as a result of liquefaction and bearing capacity failure of silty and sandy soils in Gölbaşı-Adıyaman. Poor-quality structures collapsed significantly. Many buildings were heavily damaged but did not collapse during the initial shock. Most of these structures collapsed during the subsequent shocks. Thousands of people lost their lives, and many others were injured. Ground deformations occurred in the Amik Basin and around the Asi River in Antakya due to liquefaction. The runway of Antakya Airport collapsed due to faulting and liquefied soils. Slope failures also developed near the fault trace.