Soil Dynamics Characteristics to Earthquake Using HVSR Method in Palu City

Abstract On September 28, 2018, a 7.4 magnitude earthquake struck the west coast of Sulawesi Island, resulting in significant loss of life and destruction of infrastructure in Palu City. This disaster highlighted the urgent need for focused attention on the city and measures to mitigate earthquake damage as a crucial step in victim prevention and risk reduction. One method to assess potential earthquake hazards based on local soil dynamics is microtremor measurement. In this study, the microtremor measurement results were analyzed using the HVSR method to evaluate earthquake-prone surface conditions through three main parameters: the dominant period, seismic vulnerability index, and sediment layer thickness. The findings indicate that the dominant period values in Palu City range from 0.3676 to 2.7777, the seismic vulnerability index varies from 3.134 to 34.720, and sediment layer thickness ranges from 31.14 m to 248.5 m. These results demonstrate varying levels of earthquake vulnerability across different sub-districts in Palu City.