The ground movement caused by the liquefaction phenomenon is one of the disasters that has claimed many lives and material losses in the devastating earthquake that occurred in the cities of Palu, Sigi, and Donggala on September 28, 2018. The village of Langaleso was certainly also affected, resulting in damage to existing facilities and infrastructure. This research investigations the characteristics of the soil and the potential for liquefaction in the soil that is suspected to have occurred. This research was conducted by using the Swedish Weight Sounding test and laboratory testing in the form of particle size analysis and Atterberg boundaries. Data analysis was performed by using the values of Cyclic Stress Ratio (CSR) and Cyclic Resistance Ratio (CRR), safety factor (FS), Liquefaction Potential Index (LPI), and Probability of Liquefaction (PL) . The study was carried out at 10 test points with a groundwater level of 0.68 meters sourced from JICA in 2020. The results of laboratory testing showed that the soil types range from loamy sand to silty sand with poor grades. While the Swedish Weight Sounding test obtained Nsw values between 0.00 – 454.55 n/m, qa values ranged from 0.00 – 393.64 kN/m2 and qu values ranged from 2.22 – 385.91 kN/m2 . It can be concluded that all test points have the potential for liquefaction to occur, where liquefaction occurs at varying depths at a minimum depth of less than 10 meters with an earthquake acceleration limit value (amax ) of 0.15 g and an earthquake magnitude of 5 Mw.

Keywords : Liquefaction Potential; Swedish Weight Sounding; Langaleso Village.