Spatial Geochemical Analysis of Liquefaction Hazard: Statistical Correlation of Clay Content, Water Content, and Soil Density Based on PU-Pera Geotechnical Data against Earthquake-Prone Areas (Palu Plain, Central Sulawesi)
DOI:
https://doi.org/10.70076/cj.v2i2.139Keywords:
Liquefaction, Palu, Geotechnical Engineering, Clay Mineralogy, GWR, Quaternary GeologyAbstract
This study investigates the 2018 Palu liquefaction event through a spatial-geochemical assessment of geotechnical parameters. By integrating PUPR secondary datasets (clay fraction, water content, density) with BNPB seismic maps via GIS, the research establishes critical correlations within the Palu basin. Results from CPT and SPT data indicate that the Liquefaction Potential Index (LPI) is inversely correlated with soil density (r = -0.782, p < 0.001) and positively linked to moisture content (r = 0.655, p < 0.001). Geochemically, the presence of montmorillonite within Holocene deposits enhances water retention capacity, thereby accelerating pore-water pressure development during seismic loading. Geographically Weighted Regression (GWR) further reveals spatial heterogeneity across the valley, underscoring the role of lithological diversity. These findings provide an important basis for risk-informed land-use planning and for developing more resilient infrastructure in Quaternary basins.
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