The analysis of liquefaction potential in Balaroa area, Palu City, Central Sulawesi

On September 28, 2018, Mw 7.5 earthquake in Central Sulawesi caused the shift that occurred in the Palu Koro fault to trigger several disasters. It includes tsunamis on the coast of Palu City and liquefaction in several areas including Petobo, Balaroa, and Jono Oge Village. The liquefaction phenomenon is the loss of soil strength during an earthquake higher than 0.1 g which generally occurs in loose sandy soil with high groundwater levels. This study aims to determine the liquefaction potential in Balaroa, Palu city, Central Sulawesi. The analysis of liquefaction potential was carried out using the Settle3 software with N-SPT (Standard Penetration Test) and PGA (peak ground acceleration) data of 0.33 g. Each analysis produced a safety factor value based on the review point. Furthermore, the Liquefaction Potential Index (LPI) as well as Liquefaction Severity Index (LSI) were calculated. Based on the analysis carried out through two review points of the soil test, the results of this study showed that the drilling point of BH 01 (at the top part of the area) had liquefaction potential with high damage potential. Meanwhile, the drilling point of BH 02 (at the un-liquified area) had liquefaction potential.