Identification of Landslide Hazard Areas in the Palaran District, Samarinda, East Kalimantan

The study focuses on the Palaran District in Samarinda, East Kalimantan, Indonesia. Its objectives include mapping the spatial distribution of mass movements, analyzing soil characteristics and types, categorizing mass movement events, and assessing slope stability and soil load capacity. The research employs the weight of evidence (WoE) method, physical soil property tests, direct shear tests, Morgenstern–Price slope stability analysis, and cone penetration testing (CPT). The WoE method was used to create a landslide hazard map by evaluating 13 conditioning parameters. Parameters with AUC values above 0.7—such as slope gradient, elevation, soil type, and distance to the river—were deemed reliable. The hazard map's validation via the ROC curve yielded an AUC of 0.943, reflecting excellent model performance. The map indicates that Handil Bakti Subdistrict has the highest hazard level, covering 48.09% of the area, roughly 22.419 km2. In the Palaran area, types of mass movements include successive rotational and debris slides. Soil tests show that clay is the predominant soil type. Slope stability analysis reveals only two slopes have safety factors above 1.25. CPT results suggest potential slip surfaces could develop at shallow depths between 0.8 and 1.6 meters. The findings provide a vital foundation for future landslide mitigation and risk management efforts

Cone penetration test · Debris · Hazard · Hazard analysis · Hazard map · Landslide · Mass movement · Slope stability · Geotechnical and construction materials studies · Landslides and related hazards · Water and Land Management