The Preliminary Study of Liquefaction Susceptibility Map in the Yogyakarta-Bawen Toll Road Sections I and II, Indonesia

The parts of Yogyakarta-Bawen Toll Road Indonesia, based on the geological agency’s liquefaction susceptibility map are located moderately susceptible to soil. This can be a preliminary indication as it roughly indicate potential. However, cannot illustrate actual condition in detail its inputs macro parameters (geological and seismicity factors). existence silty sand sand, earthquake sources, shallow groundwater increase possibility occur this important national project. Therefore, Liquefaction Severity Index (LSI) Potential (LPI) using Sonmez’s Iwasaki’s analysis methods conducted with peak ground acceleration (PGA) 0.322 g for first section second 0.298 g. results three types have relatively similar trends but differences each category. LSI’s categories very low-moderate observed location, meanwhile, LPI’s low-very high.