The East Anatolian Fault zone, in conjunction with the North Anatolian Fault zone, represents the most active seismic region in Turkey. Historically, seismic activity along this fault zone has led experts to anticipate significant earthquakes, particularly on segments such as the Amanos Segment within the Southern Strand. However, the earthquake of magnitude 7.8 on February 6, 2023, was unprecedented as it ruptured the entire Southern Strand. The magnitude, rupture length of 560 km, and coseismic displacement of 7.3 m were perplexing for geoscientists, as none of the three segments of the Southern Strand individually possessed the capacity to generate such an earthquake. This study employs interseismic displacements derived from InSAR and GNNS data to elucidate the kinematic mechanism of the ruptured faults. Based on our findings, we contend that the basement fault played a pivotal role in the February 6th event.