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The 2023 Kahramanmaraş earthquake sequence significantly impacted southeastern Türkiye. A comprehensive field investigation of 40 cone penetration tests and 7 seismic cone penetration tests was conducted to characterize the subsurface conditions of several areas affected by liquefaction in the port city of İskenderun. The investigations were performed at a key seismic station in the area, five areas with differing liquefaction-induced building settlements, and three lateral spread sites. The reclaimed shoreline area, which exhibited the most significant liquefaction effects, is underlain by thick medium dense clean sand deposits. Ground shaking characteristics in the investigated areas are estimated and essential subsurface data for developing high-quality field case histories are developed to support studies of liquefaction triggering and effects in İskenderun. In this context, it contributes to advancing liquefaction engineering and informs seismic hazard mitigation strategies in urban areas. 

This dataset comprises a subsurface characterization of key liquefaction areas in İskenderun, Türkiye, following the February 6, 2023, Kahramanmaraş earthquake sequence. Field testing was conducted from March 18 to March 27, 2024. The dataset includes Cone Penetration Tests (CPT) as well as seismic CPTs (SCPT) and incorporates pore pressure dissipation measurements, shear wave velocities, and standard CPT readings. High-quality subsurface investigations, such as this dataset, are a key component of liquefaction case histories. As such, this data is vital for future analyses of liquefaction-induced building settlements, building-ground interactions, and liquefaction-induced ground deformations resulting from the Kahramanmaraş earthquake sequence.